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No chapter abstract available.

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Pharmacology is a broad science that studies the origin, nature, chemistry, effects, and uses of drugs. The study of a drug’s biological effects on patients, as used in medical treatment, is called clinical pharmacology. This focuses on the rate at which the body absorbs a drug, its distribution, excretion, and potential toxicity or adverse effects. Clinical pharmacology studies drug effects in patients and healthy volunteers. Drugs are administered in higher quantities than ever before in history. Approximately 4 billion prescriptions are written every year in the United States alone. Nearly 50% of all Americans take at least one prescription drug regularly. Substances used for therapeutic purposes are drugs or medicines, biologics, or alternative therapies. Drug names include chemical, generic, and brand or trade names. Drug sources include plants, animals, minerals, synthetic or semisynthetic sources, and genetic engineering. With the evolution of pharmacology, the healthcare industry plays a more critical role than ever in ensuring the successful use of medications.

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Taking new drugs, treatments, or therapies to market is a demanding, expensive, and time-consuming journey from an initial idea to a product ready to launch. In some cases, the research and development process for new treatments and therapies can take over a decade and cost billions of dollars. A pharmaceutical company seeking FDA approval to sell a new prescription drug must complete a five-step process: discovery/concept, preclinical research, clinical research, FDA review, and FDA post-market safety monitoring. Drug regulations play an essential role in ensuring the safety and efficacy of approved drugs. They not only regulate the pricing of drugs but also their quality. The regulations are required for innovations and existing products to improve health status. Both products produced domestically and those imported from other countries need regulation. Every country has rules for innovation, manufacturing, drug testing, marketing, and post-marketing studies. The aim is to maintain the standards of the drug at every step to cater to the patient population of each country.

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Pharmacokinetics studies drug movement throughout the body and what the body does to medication after administration. The body contains many barriers that medications must cross to exert their effects. These barriers include the stomach membranes, the portal vein, the liver, the systemic circulation, the target tissues, and the target cells. Numerous physiological processes occur as a medication attempts to reach target tissues and cells. Stomach acid, digestive enzymes, liver enzymes, and many other bodily substances break down drug molecules. A drug that is interpreted as foreign by the body may trigger an immune response. The kidneys, large intestine, and lungs excrete drugs. The four categories of pharmacokinetics are absorption, distribution, metabolism, and excretion.

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The term pharmacodynamics refers to how a drug changes in the body. It is the branch of pharmacology focusing on the mechanisms of drug action and how drug concentrations cause responses in the body. To understand how drugs can apply the principles of pharmacodynamics to the treatments required by the patients, one must recognize that it exhibits a unique affinity for a drug–receptor site, meaning how strongly it binds to the site. All drugs produce their effects by interacting with biological structures or targets at the molecular level to induce a change in how the target molecule functions regarding subsequent intermolecular interactions. The pharmacologic response depends on the drug binding to its target as well as the concentration of the drug at the receptor site. Each patient may respond to a given drug much differently than others will. The fundamentals of pharmacodynamics include dose–response relationships, drug–receptor interactions, and therapeutic indexes.

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Pharmacogenomics is a rapidly growing field of medicine that investigates how a person’s genetic makeup may affect how their body processes certain medications. It involves genetic testing that looks for changes in specific genes. Pharmacogenomics is part of the field of precision medicine. This personalized treatment is based on a person’s genes, environment, and lifestyle. Therefore, it can help healthcare providers prescribe a medication that leads to fewer side effects or that may work better for patients. Specific drug therapies are individualized if a genetic variation that affects drug disposition is known. This may improve drug efficacy and reduce adverse effects. Drug toxicity refers to the level of damage that a compound can cause to an organ. It involves the accumulation of an excessive amount of any medication in the blood. The medication’s effects are more intense at toxic levels, and adverse effects may be severe or lethal. Drug toxicity can occur when a dose is too high or when drug clearance via the liver or kidneys is insufficient to remove the drug from blood circulation.

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Drug–drug interactions can be defined as two different medications altering each other’s effects on the body, referring to the capability of changing one or more pharmacological responses as a direct consequence of being exposed to one or more drugs taken together or operating concurrently in an organ system. A systematic understanding of drug interactions, particularly absorption, elimination, transport, and drug metabolism, may help prevent adverse effects. Predicting pharmacodynamic interactions often requires a deeper understanding of the underlying mechanisms. Electronic prescribing systems are beneficial. Adverse drug reactions are unexpected and unplanned responses to drugs, even when average doses are used. The FDA mandates reporting severe or unexpected events within 2 weeks of their occurrence. Unfortunately, insufficient attention has been paid to the incidence of ADRs in children of all ages.

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Plant-based products used to treat diseases or maintain health are called herbal, botanical, or phytomedicines. An herbal supplement is a product made from plant sources and used only for internal use. Herbal supplements come in all forms. They may be dried, chopped, powdered, or in capsule or liquid form. The practice of using herbal supplements dates back thousands of years. Today, herbal supplement use is widespread in the U.S. Approximately 76% of people take dietary supplements. It is estimated that more than 170 million Americans take nutritional supplements. One out of four patients using prescription medication also consumes some dietary supplements. Around the world, about 80% of individuals routinely use nutritional supplements and herbal remedies to treat or prevent illnesses. Some believe that dietary supplements and herbal products are harmless and helpful. However, since the FDA does not regulate them, there can be contaminants and variances in quality that consumers need to be aware of. Sometimes, the preparations may cause significant toxicity and adverse effects. Therefore, drug interactions and drug toxicity must always be considered.

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Medication errors frequently occur in various settings. These medical mistakes are primarily observed in children and older adults. Key factors contributing to medication errors include prescribing, dispensing, administration, and patient compliance. It is essential to ensure that all medications intended for patient use are thoroughly understood to prevent mistakes. Medication reconciliation, a safety strategy that compares patients’ medication lists with those maintained by their healthcare providers, can help reduce drug–drug interactions. The seven “rights” of drug administration must be strictly followed. Accurate documentation is critical, and medical staff are legally and ethically obligated to report medication errors to enhance patient outcomes.

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No chapter abstract available.

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The nervous system is a complex part of the human body. However, significant progress continues within the scientific discipline of neuroscience. Many medications are available for various disorders of this system. Pharmacotherapy for nervous system disorders is extensive. This chapter discusses antiseizure treatments, antimigraine medications, and the treatment of Parkinson’s disease (PD) and Alzheimer’s disease (AD). A seizure is an abnormal, uncontrolled electrical discharge in the brain’s cortical gray matter, transiently interrupting normal function. Seizures can be absent, partial, febrile, tonic–clonic, or myoclonic. A migraine is a complicated condition characterized by a severe headache, most often unilateral on one side of the head. The pain is much worse than a typical headache and is usually accompanied by various neurological symptoms. PD is the second most common degenerative disorder affecting the nervous system. It develops insidiously and slowly progresses over several months to years. AD involves the destruction of memory, thinking skills, and the ability to carry out the simplest tasks. Senile plaques, beta-amyloid deposits, and tangles of neurofibrils are found in the cerebral cortex. Treatment for each of these disorders is specific.

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The autonomic nervous system is a component of the peripheral nervous system, playing a crucial role in maintaining homeostasis. Adrenergic agonists stimulate adrenergic receptors, simulating certain aspects of sympathomimetics. They are categorized into catecholamines and noncatecholamines. Adrenergic compounds inhibit the action of epinephrine, norepinephrine, and other catecholamines, which control autonomic outflow and some functions of the central nervous system at the adrenergic receptors or inhibit their release. Adrenergic antagonists can act directly or indirectly and are also referred to as sympatholytics. There are five adrenergic receptors divided into two groups: the first group consists of the beta (β) adrenergic receptors, which include https://www.w3.org/1998/Math/MathML" display="inline"> β 1 , https://www.w3.org/1998/Math/MathML" display="inline"> β 2 , and https://www.w3.org/1998/Math/MathML" display="inline"> β 3 receptors. The second group comprises the alpha (α) adrenoreceptors with https://www.w3.org/1998/Math/MathML" display="inline"> α 1 and https://www.w3.org/1998/Math/MathML" display="inline"> α 2 receptors. Most symptoms produced by adrenergic antagonists involve parasympathetic activation. Cholinergic agonists are a group of medicines that mimic the actions of acetylcholine (ACh), acting directly on the ACh receptor. Some drugs are specific to muscarinic receptors, while others are typical for nicotinic receptors.

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Major depressive disorder is one of the most common mental illnesses, affecting more than 21 million American adults each year. It is characterized by a persistent sense of hopelessness and despair. Major depression manifests through symptoms that interfere with the ability to sleep, eat, work, study, and enjoy previously pleasurable activities. Depression can result in various emotional and physical problems with long-term consequences. Individuals with anxiety disorders often experience intense, excessive, and persistent worry and fear about everyday situations. Bipolar disorder is a severe mental illness characterized by unusual shifts in mood, ranging from extreme highs to lows. Patients with bipolar disorder also encounter changes in their energy, thinking, behavior, and sleep patterns. Schizophrenia impacts how people think, feel, and behave. Individuals with schizophrenia often appear to have lost touch with reality, causing significant distress for both the patient and their family members. Positive symptoms of schizophrenia include delusions and hallucinations, while negative symptoms encompass a blunted affect and lack of motivation.

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Anesthesia refers to the loss of sensation or awareness. Anesthetics cause either a local or general loss of sensation and pain. Anesthesia involves using medications to prevent pain during surgery and other procedures. These medications are known as anesthetics. They may be administered through injection, inhalation, topical lotion, spray, eye drops, or skin patches. Anesthesia can be applied in minor procedures, such as filling a tooth. It may also be utilized during childbirth or a colonoscopy. Additionally, it is employed in both minor and major surgeries. Local anesthesia provides reversible nerve blockade, resulting in the loss of pain sensation. Local anesthetics are categorized as esters or amides. Topical application and direct infiltration anesthetize the immediate area. Regional blocks anesthetize larger areas via a nerve or field block.

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Substance abuse, also known as drug abuse, refers to the use of a drug in amounts or through methods that are harmful to the individual. It represents a form of substance-related disorder. Drug abuse is a term frequently used in public health, medical, and criminal justice contexts. The stigma surrounding it is magnified by negative perceptions that impact individuals on antidepressants or atypical antipsychotics. Addiction is a brain disease that influences behavior. Approximately $532 billion is spent annually on addiction-related costs in the United States alone. Provisional data from the CDC’s National Center for Health Statistics indicate that there were an estimated 107,543 drug overdose deaths in the United States during 2023. Substance abuse affects individuals of all ages. For instance, babies born to mothers who are addicted to drugs or alcohol are often born prematurely and are underweight. Affected adolescents tend to perform poorly in school, have more unplanned pregnancies, and experience a higher incidence of disease and violence. Illicit fentanyl, primarily manufactured in foreign clandestine labs and smuggled into the United States through Mexico, is being distributed across the country and sold on the illegal drug market. Fentanyl is being mixed with other illicit drugs to enhance potency, sold as powders and nasal sprays, and increasingly pressed into pills designed to resemble legitimate prescription opioids.

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Coronary heart disease is a type of heart disease in which the heart’s arteries cannot deliver enough oxygen-rich blood to the heart. It is also sometimes referred to as coronary artery disease (CAD) or ischemic heart disease. Cardiovascular disorders affect the heart and blood vessels and are often related to atherosclerosis and arteriosclerosis. As plaque builds up in the arterial walls, it narrows the arteries, making it more difficult for blood to flow normally. The heart muscle requires a constant supply of oxygen-rich blood. CAD that narrows one or more of these arteries can block blood flow, resulting in angina or myocardial infarction (MI). Discomfort may not always be felt in the chest; it can also occur in the jaw or arm when a blood clot forms, potentially blocking blood flow entirely, which can lead to MI or stroke. Other chronic cardiovascular disorders include hypertension and heart failure. Many medications are available to treat CAD, including statins, niacin, fibrates, and bile acid sequestrants. Other treatments include nitroglycerin, aspirin, beta-blockers, calcium channel blockers, angiotensin-converting enzyme inhibitors, and angiotensin II receptor blockers. Drugs used for MI include morphine, thrombolytics or fibrinolytics, and beta-blockers.

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Hyperlipidemia is characterized by elevated fats or lipids in the blood. “Lipids” generally refers to cholesterol and triglycerides found in the blood. An elevation in low-density lipoproteins, one of the three main subclasses of cholesterol, has been linked to the development of atherosclerosis and the most common type of heart disease, coronary heart disease. Atherosclerosis is the accumulation of plaque, which narrows and stiffens the arteries. This contributes to heart disease, the leading cause of death in the US. Approximately every 34 seconds, one American adult has a coronary event, and roughly every minute, an American adult dies from one type of cardiovascular disease (CVD). This represents a financial burden to society, with the total direct and indirect costs of CVD in 2021 estimated to be $407 billion. For comparison, the estimated cost of all cancers was $201.5 billion. CVD costs more than any other disease state. Because avoiding CVDs is desired, hyperlipidemia treatments exist, and these include diet, exercise, and drugs such as statins, bile acid sequestrants, niacin, fibrates, and selective cholesterol absorption inhibitors. Statins are the mainstay of hyperlipidemia treatment.

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Hypertension remains one of the most significant causes of mortality worldwide. It can be prevented through medication and lifestyle modifications. Individuals with hypertension are at greater risk for coronary heart disease, atrial fibrillation, heart failure, stroke, renal damage, peripheral artery disease, and dementia. Primary hypertension may occur without identifiable causes but is influenced by cardiovascular risk factors stemming from environmental and lifestyle changes. Various toxicities, iatrogenic diseases, and congenital conditions contribute to secondary hypertension. The complications of hypertension encompass clinical outcomes of persistent hypertension, leading to cardiovascular disease, atherosclerosis, kidney disease, diabetes mellitus, metabolic syndrome, preeclampsia, erectile dysfunction, and eye disease. Treatment strategies for hypertension include lifestyle modifications—such as a diet rich in fruits, vegetables, and low-fat foods, along with fish that has reduced saturated and total fat content; salt restriction; maintaining an appropriate body weight; regular exercise; moderate alcohol consumption; and smoking cessation—as well as drug therapies. However, these approaches may vary somewhat based on published hypertension treatment guidelines.

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Various conditions, such as endocarditis or myocardial infarction, can damage the heart’s conduction system and disturb its regular rhythm. These events may lead to arrhythmia, also known as dysrhythmia. These conditions represent abnormal heart rhythms, as the only normal rhythm of the heart is a normal sinus rhythm. With this rhythm, an impulse is generated in the sinoatrial node, which is conducted through and slowed while passing through the atrioventricular node. Arrhythmias can be classified as bradycardias or tachycardias. Bradycardias are further divided into sinus bradycardias and heart block. Tachycardias may be supraventricular or ventricular. Antiarrhythmics can prevent and treat irregular heart rhythms. They can reduce symptoms and help avoid life-threatening complications. Their mechanism of action classifies them. The four primary classes of antiarrhythmic medications include class Ia, Ib, Ic, and sodium blockers. Class II drugs are beta-blockers, class III are potassium channel blockers, and class IV drugs include calcium channel blockers.

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Anticoagulants are drugs that prevent blood from clotting. They can break down existing clots or prevent them from forming. These medications help prevent life-threatening conditions such as pulmonary embolisms (PEs), strokes, and heart attacks. Anticoagulation therapy prevents and treats blood clots associated with various diseases. Thrombolytics can break up clots, enhancing blood flow to the heart, brain, lungs, and other organs. The primary aim of anticoagulant use is to prevent venous thromboembolic events or blood clots. Deep vein thrombosis and PE are common disorders. It is estimated that over 100,000 patients die from coagulation problems each year. Atrial fibrillation is the most prevalent heart arrhythmia associated with coagulopathies and is recognized as the most significant independent risk factor for stroke. Anticoagulants come in various forms, including intravenous injections and oral medications. Heparin has two types: unfractionated heparin and low-molecular-weight heparin, as well as fondaparinux. Thrombin inhibitors work by binding to thrombin, preventing it from facilitating the clotting process. Warfarin is a vitamin K antagonist, meaning it blocks the use of vitamin K and is administered orally.

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Anemia is a common blood disorder characterized by abnormally low levels of red blood cells (RBCs). It is critical to health as it contains the protein hemoglobin, which carries oxygen from the lungs to the body tissues. Several types of anemia exist, each with different causes and treatments. Anemia may be classified as iron deficiency anemia, vitamin https://www.w3.org/1998/Math/MathML" display="inline"> B 12 deficiency anemia, folate deficiency anemia, hemolytic anemia, sickle cell anemia, and aplastic anemia. Some types of anemia may be a symptom of another disease due to bleeding or significant blood loss, destruction of RBCs, poor nutrition, certain medications, and other specific diseases. Nutritional deficiency-related anemia can be prevented by consuming a diet rich in iron and vitamin https://www.w3.org/1998/Math/MathML" display="inline"> B 12 or by supplementing these minerals and vitamins when dietary intake is insufficient. Most other types of anemia cannot be prevented, and treatment depends on the severity and cause of the anemia. Severe anemia may require a blood transfusion. Anemia caused by drug therapy can be treated by discontinuing the medication. In contrast, inherited hemolytic anemia may require a splenectomy.

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The hypothalamus coordinates the endocrine system, releasing and inhibiting hormones that act on the pituitary gland to influence the functions of the thyroid, adrenal, and reproductive organs. The thyroid gland secretes thyroxine and triiodothyronine hormones through a negative feedback process. High or low levels of thyroid-stimulating and free thyroid hormones characterize thyroid dysfunction. The adrenal glands secrete several hormones, with the primary hormones of the adrenal cortex being corticosteroids and mineralocorticoids. Corticosteroids are among the most widely prescribed drug classes worldwide, serving both endocrine and nonendocrine indications. Aldosterone regulates the body’s salt and water balance by increasing sodium and water retention while promoting the excretion of potassium by the kidneys. The medulla secretes epinephrine and norepinephrine. The female ovaries are responsible for the development and maturation of ova and the secretion of estrogen and progesterone. At the same time, the testes secrete testosterone for the development and maturation of sperm and the sexual differentiation of the gonads. Estrogen and progesterone replacement therapy are often used to manage and treat menopausal symptoms. Testosterone is the treatment of choice for testosterone deficiency and hypogonadism. Various medications and hormones are used to treat endocrine disorders or conditions.

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Diabetes is a common condition that affects people of all ages. There are several forms of diabetes, with Type 2 being the most common. Prediabetes is the stage that precedes Type 2 diabetes (T2D), in which blood glucose levels are higher than usual but not high enough for an official diagnosis. Combining treatment strategies can help patients manage the condition, enabling them to lead a healthy life and prevent complications. Diabetes occurs when the body is unable to properly regulate blood glucose levels. Patients with Type 1 diabetes (T1D) do not produce enough insulin, while those with T2D cannot use insulin effectively. Gestational diabetes develops in some individuals during pregnancy and usually resolves after childbirth. However, those who experience gestational diabetes face a higher risk of developing T2D later in life. The risk factors for T2D include being overweight or obese, being inactive, and having a family history of diabetes. Individuals with T1D generally do not produce sufficient insulin, while those with T2D struggle to utilize their insulin correctly.

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The respiratory system is a network of organs that facilitates the exchange of gases between the body and the atmosphere. It primarily takes in oxygen and releases carbon dioxide. The body must produce sufficient energy to sustain life, making oxygen consumption and carbon dioxide production indispensable. The respiratory system enables oxygen to enter the body and carbon dioxide to exit. Examples of respiratory disorders include allergic rhinitis, asthma, chronic obstructive pulmonary disease, cystic fibrosis, lung cancer, and pulmonary hypertension. If left untreated, lung disease can lead to health complications, bothersome symptoms, and life-threatening conditions. Respiratory medications address various breathing issues, including allergic rhinitis, asthma, chronic bronchitis, and chronic obstructive pulmonary disease. These medications can come in many forms, including oral tablets, liquids, injections, and inhalations. Inhalations are particularly effective as they deliver the medication directly to the lungs. Over-the-counter analgesics, nasal decongestants, and antihistamines effectively treat cold symptoms in adults.

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The urinary system filters blood and produces urine as a waste by-product. Its organs include the kidneys, renal pelvis, ureters, bladder, and urethra. The kidneys also regulate blood pressure and produce erythropoietin, a hormone that controls the production of red blood cells in the bone marrow. They regulate the acid–base balance and electrolytes. Diuretics increase the rate of urine flow and sodium excretion to adjust the volume and composition of body fluids. They are used to treat hypertension, heart failure, edema, and cirrhosis of the liver. Diuretics have several significant categories and physicochemical properties. They affect renal hemodynamics and their mechanism of action. Typically, they consist of five categories: thiazide diuretics, loop diuretics, potassium-sparing diuretics, osmotic diuretics, and carbonic anhydrase inhibitors. Diuretics promote sodium and water excretion by inhibiting sodium reabsorption in the renal tubules. Each class of diuretic can affect different parts of the nephron.

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The gastrointestinal (GI) system begins in the mouth and ends in the anus. The primary function of the GI system is food digestion and absorption. Food breakdown starts in the mouth with chewing and continues in the stomach, where food is mixed with acid, mucus, enzymes, and other substances. From the stomach, the fluid and partially digested food pass into the small intestine, where biochemicals and enzymes secreted by the liver, exocrine pancreas, and small intestinal epithelium break it down into absorbable components of proteins, carbohydrates, and fats. Peptic ulcer disease involves erosions in the GI tract due to mucosal damage, often caused by pepsin and gastric acid secretion. The stomach and duodenum are the most common sites for H. pylori ulcers. Medications and surgery are options for treating PUD. Typically, medications are the first line of treatment for ulcers; however, surgery may be indicated in certain patients with complications. The lower GI tract includes most of the small intestine (jejunum and ileum). The primary function of the large intestine is to digest, absorb nutrients, and eliminate waste products. Extensive reabsorption of water and electrolytes occurs in the right proximal colon.

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Many disorders can affect the skeletal system, including bone diseases and arthritis. These can weaken bones, leading to fractures or deformities. Common bone and joint diseases include rheumatoid arthritis (RA), osteoarthritis (OA), ankylosing spondylitis, osteoporosis, and gout. These disorders impact the bones, joints, and ligaments. RA is a chronic autoimmune disease of the joints, causing inflammation and pain. It occurs more frequently in females than in males. Treatment options include medication and physical therapy. OA is a progressive, degenerative joint disease and is the most common type of arthritis, especially among older individuals. Patients often experience joint pain and stiffness. Risk factors include aging, obesity, injury or surgery, and a family history of OA. Gout is a metabolic disorder characterized by joint inflammation, primarily caused by the accumulation of needle-shaped uric acid crystals in the joints. Gout has no cure; however, it can be managed with medication and self-management strategies.

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The skeletal muscle system, including muscles, bones, tendons, and ligaments, is vital to the musculoskeletal system. It is responsible for movement, body position, stabilizing joints, and generating heat. The skeletal muscles are voluntary, and the central nervous system controls them. A whole skeletal muscle is considered an organ of the muscular system. Each organ or muscle consists of skeletal muscle tissue, connective tissue, nerve tissue, and blood or vascular tissue. Skeletal muscles vary in size, shape, and arrangement of fibers. There are more than 600 muscles in the body. Skeletal muscle disorders are a group of conditions that can affect the skeletal muscles, including muscle spasms, muscular dystrophy, fibromyalgia, myasthenia gravis, and amyotrophic lateral sclerosis. Approximately 1.71 billion people have musculoskeletal conditions worldwide that can cause disability. Low back pain is the leading cause of disability. Muscle disorders may cause weakness or paralysis in the presence of an intact nervous system. Muscle spasms commonly occur, and muscle relaxants are frequently prescribed.

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No chapter abstract available.

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Acetaminophen and nonsteroidal anti-inflammatory drugs (NSAIDs) are the preferred analgesics for mild to moderate pain and are typically used before prescribing opioid analgesics. Acetaminophen is both an analgesic and an antipyretic. It is also known as N-acetyl-para-aminophenol, a nonopioid analgesic and antipyretic agent used to treat pain and fever. NSAIDs are commonly utilized to manage mild and moderate acute and chronic pain. Individuals who take NSAIDs (excluding aspirin), such as ibuprofen, may have an increased risk of experiencing a heart attack or stroke compared to those who do not use them. These events may occur unexpectedly and can result in death. The risk may be heightened for patients who use NSAIDs for an extended period or at higher doses. NSAIDs like ibuprofen should be avoided in patients who have recently had a heart attack, hypertension, hypercholesterolemia, or stroke. While NSAIDs can be used as monotherapy, their efficacy is greater in combination with opioids for pain management. One of the primary disadvantages of NSAIDs is the risk of gastrointestinal side effects, particularly GI bleeding. This complication can occur more significantly in patients with ulcerative disease, those on higher doses, the elderly, and with concomitant use of corticosteroids, anticoagulants, or other NSAIDs.

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Pain is an unpleasant sensory and emotional experience. It can be mild or severe, encompassing steady, throbbing, stabbing, aching, burning, pinching, pricking, tingling, or stinging sensations. Pain may be classified as acute or chronic. It serves a vital function in the nervous system by warning of potential bodily injury. Additionally, pain can be influenced by psychological factors. Chronic pain can lead to complications beyond physical symptoms, with patients often experiencing depression, anxiety, and insomnia. Treatments for pain include medications, physical therapy, psychological therapies, and alternative therapies. Nonsteroidal anti-inflammatory drugs are most effective for mild to moderate pain associated with inflammation. They are commonly used for arthritis and pain resulting from muscle sprains, strains, back and neck injuries, or menstrual cramps. Acetaminophen is generally the first recommendation for mild to moderate pain. Narcotic medications are prescribed for severe pain, with opioid analgesics now among the most commonly prescribed drugs for patients in the United States. Effective pain management strategies are essential for treating chronic pain disorders.

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Cancer is a disease in which some of the body’s cells grow uncontrollably and spread to other parts. The mechanisms behind cancer development are not fully understood. Genetic and environmental factors, age, and gender play roles in cancer development. It can begin in almost any cell or tissue in the body. Normally, human cells grow and multiply to form new cells as needed. When cells age or become damaged, they die, and new cells replace them. In 2024, there were 2,001,140 new cancer cases and 611,720 cancer deaths in the United States. Treatments include surgery, chemotherapy, radiotherapy, immunotherapy, and targeted therapy. In recent decades, millions of cancer patients have been cured by chemotherapy alone. Chemotherapy is one of the most effective cancer treatments, alongside surgery and radiotherapy. It inhibits cell proliferation, helping to prevent metastasis. However, it may cause toxicity in normal cells. Combining chemotherapy and radiation can shrink the tumor before surgery or indicate curative intent in cancers such as head and neck, lung, and colorectal cancer.

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Vitamins are essential for bodily functions and must be consumed in small amounts through the diet. Although they do not provide energy, they aid in energy metabolism, tissue growth, development, and maintenance. Fat-soluble vitamins dissolve in organic solvents, including vitamins A, D, E, and K. The water-soluble vitamins consist of the B vitamin complex and vitamin C, which dissolve in the body’s water. Vitamin deficiency can occur and significantly affect health. Initially, a deficiency and its associated signs and symptoms can be reversed by increasing the intake of the specific vitamin. Hypervitaminosis, or vitamin toxicity, generally results from consuming excessive amounts of vitamins A or D. Minerals are nutrients needed in small quantities to support the body’s health. They include calcium, iron, iodine, and magnesium. Minerals naturally exist as inorganic substances that the human body cannot produce. A mineral is considered a nutrient when inadequate intake leads to a decline in biological function or overall health.

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Antibiotics are vital medications that effectively treat infections caused by bacteria, prevent the spread of infections, and reduce the complications of serious diseases. They are effective for most bacterial infections. However, they are ineffective against viral infections and other microorganisms. Each antibiotic targets specific types of bacteria. It is crucial to identify the cause of the illness when selecting an antibiotic for treatment. The overuse and misuse of antibiotics are significant contributors to the development of antibiotic resistance. The general public, healthcare providers, and hospitals can collaborate to ensure the proper use of these drugs, helping to slow the development of antibiotic resistance. For example, several decades ago, Staphylococcus aureus was susceptible to penicillin. However, over time, strains of this bacterium developed an enzyme that breaks down penicillin, making the drug ineffective. Other bacteria have also developed resistance to various antibiotics. Antibiotics are powerful medicines used to treat certain illnesses; however, they do not cure everything, and the use of unnecessary antibiotics can be detrimental.

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Viruses are tiny infectious agents that rely on living cells to multiply. They may use an animal, plant, or bacterial host to survive and reproduce. As such, there is some debate about whether viruses should be considered living organisms. A virus outside a host cell is known as a virion. They consist of small genetic material, either DNA or RNA, enclosed in a protective shell known as a capsid. Some viruses also possess an envelope. Viruses cannot reproduce without a host. Common diseases caused by viruses include influenza, human herpes viruses, enteroviruses, hepatitis viruses, human papillomaviruses, and COVID-19. They are obligate intracellular parasites that must reside within a living host cell to survive and replicate. Viruses invade healthy cells, multiply within them, and utilize their DNA and RNA to produce more viruses. The growth cycle of viruses relies on host cell enzymes and cellular substrates for viral replication. Except for human immunodeficiency virus and certain types of viral hepatitis, viruses typically cause self-limiting illnesses that usually do not require treatment with specific antivirals. Current antiviral medications target influenza, herpes, and hepatitis. Essentially, viruses are particles that infect and replicate within cells.

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Fungi are living organisms that release spores into the air. Only a few fungi pathogenic to humans possess the virulence required to infect a healthy host. Most are relatively harmless unless they come into contact with an immunocompromised patient, whose weakened immune system allows them to invade the body. Primary pathogens can establish infections in healthy hosts, while opportunistic pathogens cause disease in individuals with compromised immune defense mechanisms. There are two main categories of antifungal agents: systemic and superficial. Fungal infections, known as mycoses, are significantly more common in their superficial form than in their systemic form. Infecting fungi can be categorized as either exogenous or endogenous. Exogenous fungi enter through airborne, cutaneous, or percutaneous exposure. Endogenous infections occur through colonization by members of the normal flora or reactivation of a previous infection. Specific drugs are designated for either superficial or systemic mycoses, and a few are effective for both.

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Parasitic infectious diseases significantly impact health, society, and the economy in tropical regions worldwide. Diseases caused by protozoa, such as malaria and schistosomiasis, account for the majority of parasite-related morbidity, mortality, and annual deaths. These pathogens are prevalent in tropical and subtropical countries and contribute to some of the most common intestinal infections in the United States. Many protozoal infections are diagnosed through stool sample examinations, which are essential for surgical pathologists. Common protozoan diseases include malaria, giardiasis, and toxoplasmosis, while less common ones encompass African trypanosomiasis and amoebic dysentery. Each condition affects the body in unique ways. Protozoal infections represent serious illnesses that significantly contribute to global mortality and morbidity.

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Mycobacterial infections encompass various diseases caused by obligate aerobic bacteria, most notably Mycobacterium tuberculosis. Tuberculosis (TB) is a chronic pulmonary and systemic disease that spreads through the air when patients with lung TB cough, spit, or sneeze. Although it is more prevalent in developing countries, its incidence is rising in developed nations, likely due to the increase in AIDS cases and the growing number of drug-resistant Mycobacterium tuberculosis strains. In addition to immunocompromised individuals, other groups at increased risk include minorities, those of lower socioeconomic status, alcohol users, prisoners, and older adults. Gastrointestinal TB can be contracted from drinking milk contaminated with Mycobacterium bovis, which is uncommon in countries where milk is regularly pasteurized. However, it still occurs in nations with infected dairy cows and unpasteurized milk. In the United States, TB primarily affects immigrants from high-burden countries, older adults, racial and ethnic minorities, and individuals with AIDS. Additional risk factors for TB include malnutrition, alcoholism, diabetes mellitus, Hodgkin lymphoma, kidney failure, and silicosis.

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The discovery of vaccines is one of the most significant events in medicine. The foundations of modern immunization trace back to the 1790s when Edward Jenner developed the smallpox vaccine using the cowpox virus. In the late 1800s, Louis Pasteur created the first live attenuated bacterial vaccine and developed the first rabies vaccine. Since then, vaccines for at least 26 diseases have been created. Vaccines have saved countless lives and prevented pain, suffering, and complications from diseases that were once untreatable. The WHO estimates that immunization prevents 2–3 million deaths annually. With expanded global vaccination, an additional 1.5 million deaths could be averted. Failure to immunize can lead to serious illness from vaccine-preventable diseases. High levels of vaccination are essential for community immunity. Although an estimated 91% of children in the United States were vaccinated against measles in 2019, measles outbreaks have been reported in multiple states, partly due to underimmunization.

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Poisoning refers to injury or death caused by swallowing, inhaling, touching, or injecting various drugs, detergents, venoms, or gases. Many substances, such as drugs and carbon monoxide, become toxic only at higher concentrations or dosages. Others, like chemical detergents, are primarily dangerous when ingested. Children are particularly vulnerable to even small amounts of certain drugs and chemicals. Cyanide, arsenic, and pesticides are hazardous, even in small quantities. However, certain medications can become toxic when taken in excessive doses. Accidental poisonings are more common at home, while industrial intoxication often results from chronic exposure. Accidental poisoning usually stems from the unintentional ingestion of toxic substances, with most cases involving children. In many instances, these incidents are preventable, especially the poisoning of young children from drugs and chemicals found at home. Pediatric exposures occur because naturally curious children explore their environment through touch and taste. Such unintentional exposures typically involve small amounts ingested from household substances, primarily analgesics, due to their widespread availability.