Pharmacologic Drug Classifications (PTCB PTCE Pharmacy Technician Test Prep)
Summary
This video explains pharmacologic drug classification, grouping drugs by their mechanism of action. It details various classes, including ACE inhibitors, beta-blockers, antibiotics, and antidepressants, explaining how each works in the body and providing common generic and brand-name examples. Many classes share common suffixes, aiding in identification. The presenter emphasizes that this classification focuses on *what* a drug does physiologically to achieve its effect, differentiating it from therapeutic classification. The video serves as a comprehensive guide for understanding how different medications function at a molecular or cellular level.
Key Insights
Pharmacologic drug classification groups drugs by mechanism of action.
Pharmacologic classification means grouping drugs based on their mechanism of action—specifically, what the drug does in the body to produce the desired effect, such as the receptor it binds to or its physiological action. Many drugs in the same pharmacologic class share a common suffix in their generic names.
ACE inhibitors block the conversion of angiotensin I to angiotensin II.
ACE inhibitors are used for high blood pressure and heart failure. They block the angiotensin-converting enzyme (ACE) from converting angiotensin I into angiotensin II. This reduces angiotensin II levels, causing blood vessels to relax and lower blood pressure. Examples include bazail (Lisinopril), ramipril (Altace), and enalopril (Vasotec). Many end in the suffix 'pril'.
Alpha-2 agonists activate central nervous system receptors to inhibit norepinephrine release.
Used for high blood pressure, ADHD, and glaucoma, alpha-2 agonists activate alpha-2 receptors in the CNS, inhibiting norepinephrine release. This leads to a calming effect. Examples include clonidine (Catapres) and guanfacine (Tenex, Intuniv).
Alpha blockers inhibit norepinephrine from binding to receptors in blood vessels and prostate.
For high blood pressure and enlarged prostate (BPH), alpha blockers block alpha receptors in various tissues, preventing norepinephrine binding. This causes vasodilation and lowers blood pressure. Examples include doxazosin (Cardura), terazosin (Hytrin), and tamsulosin (Flomax), which is selective for the urinary tract. Many end in the suffix 'osin'.
ARBs block angiotensin II receptors, preventing angiotensin II from binding and causing vasodilation.
Used for high blood pressure and heart failure, ARBs block angiotensin II from binding to its receptors, leading to blood vessel relaxation. Examples include losartan (Cozaar), valsartan (Diovan), and irbesartan (Avapro). These often end in the suffix 'sartan'.
Anticholinergics block the action of acetylcholine, affecting various bodily functions.
Used for conditions like overactive bladder and COPD, anticholinergics block acetylcholine. They can have side effects like decreased urination, digestion, and secretions. Examples include oxybutynin (Ditropan) for overactive bladder, ipratropium (Atrovent) for COPD, and tiotropium (Spiriva) for COPD.
Benzodiazepines enhance GABA's calming effect on brain functions, used for anxiety, sleep, and seizures.
These drugs enhance the effect of GABA, a neurotransmitter that has a calming effect on the central nervous system. They have potential for addiction and are DEA Schedule IV. Examples include alprazolam (Xanax), clonazepam (Klonopin), lorazepam (Ativan), diazepam (Valium), and temazepam (Restoril). Many end in the suffix 'am'.
Beta blockers block beta receptors, reducing heart rate, blood pressure, and eye pressure.
Prescribed for high blood pressure, irregular heartbeat, and glaucoma, beta blockers block beta receptors of the sympathetic nervous system, decreasing norepinephrine and epinephrine binding. This lowers blood pressure and heart rate. Examples include propranolol (Inderal), metoprolol (Lopressor), carvedilol (Coreg), atenolol (Tenormin), and timolol (Timoptic) for glaucoma. The common suffix is 'olol'.
Beta-2 agonists stimulate beta-2 receptors in the lungs to relax bronchial smooth muscle.
Used for asthma and other lung diseases, these drugs bind to beta-2 receptors in the lungs, promoting bronchodilation and increasing airflow. Examples include albuterol (Proventil, Ventolin) and formoterol (Foradil). Many have the suffix 'terol'.
Biguanides decrease liver glucose production and intestinal absorption, improving insulin sensitivity.
This class of medication is used for diabetes. Biguanides reduce the amount of sugar produced by the liver and absorbed by the intestines, while also increasing insulin sensitivity, leading to better blood sugar control. The primary example is metformin (Glucophage).
Bisphosphonates slow down bone breakdown, maintaining bone density and strength.
Used for osteoporosis prevention and treatment, bisphosphonates slow the body's resorption of old bone, helping to maintain bone density. Examples include alendronate (Fosamax) and ibandronate (Boniva). They often end in the suffix 'dronate'.
Dihydropyridine CCBs block calcium channels in arterial blood vessels, causing vasodilation.
These are used for high blood pressure. They block calcium from entering voltage-gated calcium channels specifically in arterial blood vessels, causing arteries to widen and lower blood pressure. Examples include nifedipine (Procardia, Adalat CC) and amlodipine (Norvasc). They end in the suffix 'dipine'.
Non-dihydropyridine CCBs block calcium channels in arteries and the heart, lowering BP and heart rate.
Used for high blood pressure, rapid heart rate, and abnormal rhythms, these block calcium channels in both arterial blood vessels and the heart. This widens arteries to lower BP and slows the heart's contractions. Examples include diltiazem (Cardizem) and verapamil (Calan, Verelan).
Cardiac glycosides inhibit sodium-potassium ATPase, increasing intracellular calcium and force of heart contraction.
Used for heart failure and irregular heartbeat, these drugs inhibit the sodium-potassium ATPase enzyme in the heart. This increases intracellular sodium, which then increases calcium, leading to a stronger heart contraction. An example is digoxin (Lanoxin).
DPP-4 inhibitors block DPP-4, slowing the breakdown of incretin hormones and increasing insulin release.
Used for diabetes, these inhibitors block the enzyme dipeptidyl peptidase-4 (DPP-4), which slows the inactivation of incretin hormones like GLP-1. This leads to increased insulin release from the pancreas, lowering blood sugar. Examples include sitagliptin (Januvia) and saxagliptin (Onglyza). Many end in 'gliptin'.
Dopamine agonists bind to and activate dopamine receptors in the brain to reduce Parkinson's symptoms.
Used for Parkinson's disease and restless leg syndrome, these drugs bind to dopamine receptors in the brain, mimicking dopamine's effects to reduce symptoms like tremor and rigidity. Examples include pramipexole (Mirapex) and ropinirole (Requip). They often end in 'ole'.
Factor Xa inhibitors directly block clotting Factor Xa, preventing thrombin formation and clot production.
These direct oral anticoagulants treat and prevent blood clots by selectively blocking clotting Factor Xa, which prevents thrombin formation. Unlike warfarin, they don't require Vitamin K monitoring or frequent INR testing. Examples include apixaban (Eliquis) and rivaroxaban (Xarelto). The suffix is often 'xaban'.
GLP-1 analogues mimic the incretin hormone GLP-1 to stimulate insulin release after meals.
These injectable, non-insulin diabetes medications mimic the action of the natural incretin hormone GLP-1, released after eating. This stimulates insulin secretion from the pancreas. Examples include liraglutide (Victoza), dulaglutide (Trulicity), and semaglutide (Ozempic, Wegovy). They often have the suffix 'glutide' or 'atide'.
H2 blockers inhibit histamine at H2 receptors on stomach cells, reducing acid production.
Used for ulcers and acid reflux (GERD), these drugs block histamine from binding to H2 receptors on stomach parietal cells, reducing stomach acid production. Examples include famotidine (Pepcid) and cimetidine (Tagamet). Cimetidine is less common due to drug interactions. The suffix is 'tidine'.
Statins block the HMG-CoA reductase enzyme, reducing the liver's cholesterol production.
These drugs lower high cholesterol levels by inhibiting the HMG-CoA reductase enzyme, which is crucial for cholesterol synthesis in the liver. Examples include atorvastatin (Lipitor), simvastatin (Zocor), rosuvastatin (Crestor), pravastatin (Pravachol), and lovastatin (Mevacor). The suffix is 'statin'.
Potassium-sparing diuretics increase sodium and water excretion while preventing potassium loss.
Used for high blood pressure and heart failure, these diuretics promote the excretion of sodium and water via urine but crucially prevent the loss of potassium, which often occurs with other diuretics. Examples include spironolactone (Aldactone) and triamterene (Dyrenium).
Leukotriene antagonists block leukotrienes, which are released during allergic reactions in airways.
These medications are used for allergies and asthma. They work by blocking leukotrienes, substances released by the body during an allergic air pathway reaction, thus reducing inflammation and constriction. An example is montelukast (Singulair). The suffix is 'lukast'.
NDRIs selectively block the reuptake of norepinephrine and dopamine, used for depression and smoking cessation.
Used for depression and smoking cessation, NDRIs selectively block the reabsorption of norepinephrine and dopamine. An example is bupropion (Wellbutrin for depression, Zyban for smoking cessation).
SSRIs selectively block the reuptake of serotonin, used for depression and anxiety disorders.
These are widely used for depression and various anxiety disorders. SSRIs selectively block the reabsorption of serotonin. Examples include sertraline (Zoloft), fluoxetine (Prozac), paroxetine (Paxil), citalopram (Celexa), and escitalopram (Lexapro).
SNRIs block the reuptake of both serotonin and norepinephrine, used for depression, anxiety, and pain.
Used for depression, anxiety disorders, nerve pain, and fibromyalgia, SNRIs work by selectively blocking the reabsorption of both serotonin and norepinephrine. Examples include venlafaxine (Effexor), duloxetine (Cymbalta), and desvenlafaxine (Pristiq).
Nitrate vasodilators relax and widen blood vessels, improving blood flow to the heart.
Used for the treatment and prevention of chest pain (angina), these drugs relax and widen blood vessels, enhancing blood flow to the heart. Examples include nitroglycerin (Nitrostat, Nitro-Dur), isosorbide mononitrate (Imdur), and isosorbide dinitrate (Isordil).
NMDA antagonists prevent glutamate binding in nerve cells, slowing brain cell damage in Alzheimer's.
Used to improve mental function in Alzheimer's patients, NMDA antagonists prevent the binding of glutamate, a neurotransmitter. This reduces calcium release into nerve cells, slowing the nerve cell damage characteristic of Alzheimer's disease. Memantine (Namenda) is an example.
Opioids bind to opioid receptors in the brain and spinal cord to reduce pain perception.
These drugs treat moderate to severe pain by binding to opioid receptors in the brain and spinal cord, reducing the transmission and perception of pain signals. Examples include tramadol (Ultram), hydrocodone/acetaminophen (Norco), oxycodone (OxyContin, Roxicodone), morphine (Roxanol), and oxycodone/acetaminophen (Percocet). Many are DEA Schedule II and have addiction potential.
PPIs irreversibly block proton pumps in gastric cells, blocking the final step of stomach acid production.
Used for ulcers and GERD, PPIs block the final step in stomach acid production by irreversibly binding to proton pumps on gastric parietal cells. Examples include omeprazole (Prilosec), pantoprazole (Protonix), and esomeprazole (Nexium). The suffix is 'prazole'.
Prostaglandin analogues increase aqueous outflow in the eye, decreasing intraocular pressure.
These are used for glaucoma to lower pressure in the eye. They bind to prostaglandin receptors, increasing the outflow of aqueous humor from the eye, thereby reducing intraocular pressure (IOP). Examples include latanoprost (Xalatan), travoprost (Travatan), and bimatoprost (Lumigan). The suffix is 'prost'.
SGLT2 inhibitors cause glucose to be excreted in the urine instead of being reabsorbed.
These diabetes medications work by causing more glucose to be filtered out into the urine rather than being reabsorbed back into the body. Examples include canagliflozin (Invokana) and dapagliflozin (Jardiance). They have the suffix 'gliflozin'.
Triptans constrict cranial blood vessels by binding to specific serotonin receptors.
Used for migraine headaches, these agonists bind to serotonin (5-HT) 1B and 1D receptors on cranial blood vessels, causing vasoconstriction, which relieves migraine pain. Examples include sumatriptan (Imitrex) and rizatriptan (Maxalt). The suffix is 'triptan'.
Sulfonylureas increase insulin release from the pancreas's beta cells.
Used for diabetes, these drugs stimulate the beta cells in the pancreas to release more insulin. Examples include glipizide (Glucotrol) and glyburide (Diabeta, Glynase).
TNF inhibitors block the action of tumor necrosis factor, reducing inflammation in autoimmune diseases.
These biologics are used for inflammatory conditions like psoriasis, rheumatoid arthritis, and Crohn's disease. They block the action of TNF, an inflammatory cytokine produced early in the immune response, thereby reducing inflammation. Many end in 'mab' (monoclonal antibody), like adalimumab (Humira) and infliximab (Remicade).
TCAs block serotonin and norepinephrine reuptake and also affect acetylcholine and histamine.
Used for depression, nerve pain, and migraine prevention, TCAs block the reuptake of serotonin and norepinephrine. They also affect acetylcholine and histamine levels, which contribute to their use in other conditions. Examples include amitriptyline (Elavil) and nortriptyline (Pamelor).
TZDs increase cellular sensitivity to insulin, thus decreasing insulin resistance.
Used for diabetes, TZDs work by increasing the sensitivity of body cells to insulin, thereby decreasing insulin resistance. Examples include pioglitazone (Actos) and rosiglitazone (Avandia). They end in the suffix 'glitazone'.
Vitamin K antagonists block vitamin K's role in the blood clotting process.
Used for the prevention and treatment of blood clots, these drugs interfere with vitamin K, which is essential for the blood clotting cascade. Warfarin (Coumadin) is the primary example. Dietary vitamin K intake and regular INR testing are critical for effective and safe use.
Sections
Introduction to Pharmacologic Drug Classification
Pharmacologic drug classification groups drugs by mechanism of action.
Pharmacologic classification means grouping drugs based on their mechanism of action—specifically, what the drug does in the body to produce the desired effect, such as the receptor it binds to or its physiological action. Many drugs in the same pharmacologic class share a common suffix in their generic names.
This classification focuses on the drug's direct action within the body.
Pharmacologic classification is distinct from therapeutic classification, which groups drugs by what they are used for. Pharmacologic classification details the specific physiological or biochemical action a drug has, such as blocking an enzyme or binding to a receptor.
ACE Inhibitors
ACE inhibitors block the conversion of angiotensin I to angiotensin II.
ACE inhibitors are used for high blood pressure and heart failure. They block the angiotensin-converting enzyme (ACE) from converting angiotensin I into angiotensin II. This reduces angiotensin II levels, causing blood vessels to relax and lower blood pressure. Examples include bazail (Lisinopril), ramipril (Altace), and enalopril (Vasotec). Many end in the suffix 'pril'.
Alpha-2 Agonists
Alpha-2 agonists activate central nervous system receptors to inhibit norepinephrine release.
Used for high blood pressure, ADHD, and glaucoma, alpha-2 agonists activate alpha-2 receptors in the CNS, inhibiting norepinephrine release. This leads to a calming effect. Examples include clonidine (Catapres) and guanfacine (Tenex, Intuniv).
Alpha Blockers
Alpha blockers inhibit norepinephrine from binding to receptors in blood vessels and prostate.
For high blood pressure and enlarged prostate (BPH), alpha blockers block alpha receptors in various tissues, preventing norepinephrine binding. This causes vasodilation and lowers blood pressure. Examples include doxazosin (Cardura), terazosin (Hytrin), and tamsulosin (Flomax), which is selective for the urinary tract. Many end in the suffix 'osin'.
ARBs (Angiotensin II Receptor Blockers)
ARBs block angiotensin II receptors, preventing angiotensin II from binding and causing vasodilation.
Used for high blood pressure and heart failure, ARBs block angiotensin II from binding to its receptors, leading to blood vessel relaxation. Examples include losartan (Cozaar), valsartan (Diovan), and irbesartan (Avapro). These often end in the suffix 'sartan'.
Anticholinergics
Anticholinergics block the action of acetylcholine, affecting various bodily functions.
Used for conditions like overactive bladder and COPD, anticholinergics block acetylcholine. They can have side effects like decreased urination, digestion, and secretions. Examples include oxybutynin (Ditropan) for overactive bladder, ipratropium (Atrovent) for COPD, and tiotropium (Spiriva) for COPD.
Benzodiazepines
Benzodiazepines enhance GABA's calming effect on brain functions, used for anxiety, sleep, and seizures.
These drugs enhance the effect of GABA, a neurotransmitter that has a calming effect on the central nervous system. They have potential for addiction and are DEA Schedule IV. Examples include alprazolam (Xanax), clonazepam (Klonopin), lorazepam (Ativan), diazepam (Valium), and temazepam (Restoril). Many end in the suffix 'am'.
Beta Blockers
Beta blockers block beta receptors, reducing heart rate, blood pressure, and eye pressure.
Prescribed for high blood pressure, irregular heartbeat, and glaucoma, beta blockers block beta receptors of the sympathetic nervous system, decreasing norepinephrine and epinephrine binding. This lowers blood pressure and heart rate. Examples include propranolol (Inderal), metoprolol (Lopressor), carvedilol (Coreg), atenolol (Tenormin), and timolol (Timoptic) for glaucoma. The common suffix is 'olol'.
Beta-2 Agonists
Beta-2 agonists stimulate beta-2 receptors in the lungs to relax bronchial smooth muscle.
Used for asthma and other lung diseases, these drugs bind to beta-2 receptors in the lungs, promoting bronchodilation and increasing airflow. Examples include albuterol (Proventil, Ventolin) and formoterol (Foradil). Many have the suffix 'terol'.
Biguanides
Biguanides decrease liver glucose production and intestinal absorption, improving insulin sensitivity.
This class of medication is used for diabetes. Biguanides reduce the amount of sugar produced by the liver and absorbed by the intestines, while also increasing insulin sensitivity, leading to better blood sugar control. The primary example is metformin (Glucophage).
Bisphosphonates
Bisphosphonates slow down bone breakdown, maintaining bone density and strength.
Used for osteoporosis prevention and treatment, bisphosphonates slow the body's resorption of old bone, helping to maintain bone density. Examples include alendronate (Fosamax) and ibandronate (Boniva). They often end in the suffix 'dronate'.
Calcium Channel Blockers (Dihydropyridines)
Dihydropyridine CCBs block calcium channels in arterial blood vessels, causing vasodilation.
These are used for high blood pressure. They block calcium from entering voltage-gated calcium channels specifically in arterial blood vessels, causing arteries to widen and lower blood pressure. Examples include nifedipine (Procardia, Adalat CC) and amlodipine (Norvasc). They end in the suffix 'dipine'.
Calcium Channel Blockers (Non-dihydropyridines)
Non-dihydropyridine CCBs block calcium channels in arteries and the heart, lowering BP and heart rate.
Used for high blood pressure, rapid heart rate, and abnormal rhythms, these block calcium channels in both arterial blood vessels and the heart. This widens arteries to lower BP and slows the heart's contractions. Examples include diltiazem (Cardizem) and verapamil (Calan, Verelan).
Cardiac Glycosides
Cardiac glycosides inhibit sodium-potassium ATPase, increasing intracellular calcium and force of heart contraction.
Used for heart failure and irregular heartbeat, these drugs inhibit the sodium-potassium ATPase enzyme in the heart. This increases intracellular sodium, which then increases calcium, leading to a stronger heart contraction. An example is digoxin (Lanoxin).
Cephalosporins
Cephalosporins are beta-lactam antibiotics that damage bacterial cell walls, causing death.
These are beta-lactam antibiotics used for various bacterial infections. They work by damaging the bacterial cell wall, which is bactericidal (kills bacteria). Examples include cephalexin (Keflex) and cefdinir (Omnicef). They often have a prefix of 'cef' or 'ceph'.
DPP-4 Inhibitors
DPP-4 inhibitors block DPP-4, slowing the breakdown of incretin hormones and increasing insulin release.
Used for diabetes, these inhibitors block the enzyme dipeptidyl peptidase-4 (DPP-4), which slows the inactivation of incretin hormones like GLP-1. This leads to increased insulin release from the pancreas, lowering blood sugar. Examples include sitagliptin (Januvia) and saxagliptin (Onglyza). Many end in 'gliptin'.
Dopamine Agonists
Dopamine agonists bind to and activate dopamine receptors in the brain to reduce Parkinson's symptoms.
Used for Parkinson's disease and restless leg syndrome, these drugs bind to dopamine receptors in the brain, mimicking dopamine's effects to reduce symptoms like tremor and rigidity. Examples include pramipexole (Mirapex) and ropinirole (Requip). They often end in 'ole'.
Factor Xa Inhibitors
Factor Xa inhibitors directly block clotting Factor Xa, preventing thrombin formation and clot production.
These direct oral anticoagulants treat and prevent blood clots by selectively blocking clotting Factor Xa, which prevents thrombin formation. Unlike warfarin, they don't require Vitamin K monitoring or frequent INR testing. Examples include apixaban (Eliquis) and rivaroxaban (Xarelto). The suffix is often 'xaban'.
Fluoroquinolones
Fluoroquinolones inhibit bacterial DNA replication enzymes, leading to bacterial death.
These powerful antibiotics are typically used for resistant bacterial infections. They inhibit enzymes crucial for bacterial DNA replication, making them bactericidal. Examples include ciprofloxacin (Cipro) and levofloxacin (Levaquin). The common suffix is 'floxacin'.
GLP-1 Analogues
GLP-1 analogues mimic the incretin hormone GLP-1 to stimulate insulin release after meals.
These injectable, non-insulin diabetes medications mimic the action of the natural incretin hormone GLP-1, released after eating. This stimulates insulin secretion from the pancreas. Examples include liraglutide (Victoza), dulaglutide (Trulicity), and semaglutide (Ozempic, Wegovy). They often have the suffix 'glutide' or 'atide'.
H1 Blockers (Antihistamines)
H1 blockers block histamine's effects at H1 receptors, treating allergy symptoms.
These are commonly called antihistamines and are used to treat allergy symptoms like itching, runny nose, and watery eyes by blocking histamine at H1 receptors. Examples include hydroxyzine (Atarax), diphenhydramine (Benadryl), cetirizine (Zyrtec), and loratadine (Claritin).
H2 Blockers
H2 blockers inhibit histamine at H2 receptors on stomach cells, reducing acid production.
Used for ulcers and acid reflux (GERD), these drugs block histamine from binding to H2 receptors on stomach parietal cells, reducing stomach acid production. Examples include famotidine (Pepcid) and cimetidine (Tagamet). Cimetidine is less common due to drug interactions. The suffix is 'tidine'.
HMG-CoA Reductase Inhibitors (Statins)
Statins block the HMG-CoA reductase enzyme, reducing the liver's cholesterol production.
These drugs lower high cholesterol levels by inhibiting the HMG-CoA reductase enzyme, which is crucial for cholesterol synthesis in the liver. Examples include atorvastatin (Lipitor), simvastatin (Zocor), rosuvastatin (Crestor), pravastatin (Pravachol), and lovastatin (Mevacor). The suffix is 'statin'.
Potassium-Sparing Diuretics
Potassium-sparing diuretics increase sodium and water excretion while preventing potassium loss.
Used for high blood pressure and heart failure, these diuretics promote the excretion of sodium and water via urine but crucially prevent the loss of potassium, which often occurs with other diuretics. Examples include spironolactone (Aldactone) and triamterene (Dyrenium).
Leukotriene Receptor Antagonists
Leukotriene antagonists block leukotrienes, which are released during allergic reactions in airways.
These medications are used for allergies and asthma. They work by blocking leukotrienes, substances released by the body during an allergic air pathway reaction, thus reducing inflammation and constriction. An example is montelukast (Singulair). The suffix is 'lukast'.
Loop Diuretics
Loop diuretics block electrolyte reabsorption in the Loop of Henle, increasing urine output.
These diuretics are used to reduce swelling associated with various diseases. They work by blocking electrolytes from being reabsorbed in the Loop of Henle in the kidneys, causing more fluid to be excreted as urine. Examples include furosemide (Lasix) and torsemide (Demadex).
Lincosamides
Lincosamides inhibit bacterial protein synthesis reversibly, slowing bacterial growth (bacteriostatic).
These are antibiotics used for anaerobic bacterial infections. They inhibit protein synthesis required for bacterial replication in a reversible manner, making them bacteriostatic. An example is clindamycin (Cleocin). The suffix is 'mycin', same as macrolides but a different class.
Macrolides
Macrolides inhibit bacterial protein synthesis reversibly, slowing bacterial growth (bacteriostatic).
These are antibiotics used for various bacterial infections. They inhibit protein synthesis required for bacterial replication in a reversible manner, making them bacteriostatic. Examples include azithromycin (Zithromax) and erythromycin (Ery-Tab). The suffix is 'mycin', same as lincosamides but a different class.
NDRIs (Norepinephrine-Dopamine Reuptake Inhibitors)
NDRIs selectively block the reuptake of norepinephrine and dopamine, used for depression and smoking cessation.
Used for depression and smoking cessation, NDRIs selectively block the reabsorption of norepinephrine and dopamine. An example is bupropion (Wellbutrin for depression, Zyban for smoking cessation).
SSRIs (Selective Serotonin Reuptake Inhibitors)
SSRIs selectively block the reuptake of serotonin, used for depression and anxiety disorders.
These are widely used for depression and various anxiety disorders. SSRIs selectively block the reabsorption of serotonin. Examples include sertraline (Zoloft), fluoxetine (Prozac), paroxetine (Paxil), citalopram (Celexa), and escitalopram (Lexapro).
SNRIs (Serotonin-Norepinephrine Reuptake Inhibitors)
SNRIs block the reuptake of both serotonin and norepinephrine, used for depression, anxiety, and pain.
Used for depression, anxiety disorders, nerve pain, and fibromyalgia, SNRIs work by selectively blocking the reabsorption of both serotonin and norepinephrine. Examples include venlafaxine (Effexor), duloxetine (Cymbalta), and desvenlafaxine (Pristiq).
Nitrate Vasodilators
Nitrate vasodilators relax and widen blood vessels, improving blood flow to the heart.
Used for the treatment and prevention of chest pain (angina), these drugs relax and widen blood vessels, enhancing blood flow to the heart. Examples include nitroglycerin (Nitrostat, Nitro-Dur), isosorbide mononitrate (Imdur), and isosorbide dinitrate (Isordil).
Nitrofurans
Nitrofurans disrupt bacterial cell wall, RNA, and DNA synthesis, making them bactericidal in urine.
These antibiotics are specifically for urinary tract infections (UTIs). They disrupt bacterial cell wall, RNA, and DNA synthesis. In the urinary tract, they are bactericidal. Nitrofurantoin (Macrodantin, Macrobid) is an example, notable for its macrocrystal form allowing high urine concentration.
Nitroimidazoles
Nitroimidazoles inhibit bacterial nucleic acid synthesis, disrupting DNA and causing bacterial death.
These antibiotics also have antiprotozoal activity, used for anaerobic and parasitic infections. They inhibit bacterial nucleic acid synthesis, disrupting DNA, and are bactericidal. Metronidazole (Flagyl) is a common example.
NMDA Antagonists
NMDA antagonists prevent glutamate binding in nerve cells, slowing brain cell damage in Alzheimer's.
Used to improve mental function in Alzheimer's patients, NMDA antagonists prevent the binding of glutamate, a neurotransmitter. This reduces calcium release into nerve cells, slowing the nerve cell damage characteristic of Alzheimer's disease. Memantine (Namenda) is an example.
NSAIDs (Non-Steroidal Anti-Inflammatory Drugs)
NSAIDs reduce prostaglandin production by blocking the COX enzyme, relieving pain and inflammation.
Used for pain and inflammation, NSAIDs reduce the production of prostaglandins by blocking the cyclooxygenase (COX) enzyme. Examples include ibuprofen (Advil, Motrin), naproxen (Naprosyn, Anaprox), diclofenac (Voltaren, Cataflam), indomethacin (Indocin), and meloxicam (Mobic).
Opioids
Opioids bind to opioid receptors in the brain and spinal cord to reduce pain perception.
These drugs treat moderate to severe pain by binding to opioid receptors in the brain and spinal cord, reducing the transmission and perception of pain signals. Examples include tramadol (Ultram), hydrocodone/acetaminophen (Norco), oxycodone (OxyContin, Roxicodone), morphine (Roxanol), and oxycodone/acetaminophen (Percocet). Many are DEA Schedule II and have addiction potential.
Penicillins
Penicillins are beta-lactam antibiotics that damage bacterial cell walls, causing death.
These beta-lactam antibiotics treat a wide range of bacterial infections by damaging the bacterial cell wall, making them bactericidal. Penicillin was the first antibiotic. Examples include amoxicillin (Amoxil) and amoxicillin/clavulanate (Augmentin). Clavulanate inhibits enzymes that break down penicillin. The suffix is 'cillin'.
PPIs (Proton Pump Inhibitors)
PPIs irreversibly block proton pumps in gastric cells, blocking the final step of stomach acid production.
Used for ulcers and GERD, PPIs block the final step in stomach acid production by irreversibly binding to proton pumps on gastric parietal cells. Examples include omeprazole (Prilosec), pantoprazole (Protonix), and esomeprazole (Nexium). The suffix is 'prazole'.
Prostaglandin Analogues
Prostaglandin analogues increase aqueous outflow in the eye, decreasing intraocular pressure.
These are used for glaucoma to lower pressure in the eye. They bind to prostaglandin receptors, increasing the outflow of aqueous humor from the eye, thereby reducing intraocular pressure (IOP). Examples include latanoprost (Xalatan), travoprost (Travatan), and bimatoprost (Lumigan). The suffix is 'prost'.
SGLT2 Inhibitors
SGLT2 inhibitors cause glucose to be excreted in the urine instead of being reabsorbed.
These diabetes medications work by causing more glucose to be filtered out into the urine rather than being reabsorbed back into the body. Examples include canagliflozin (Invokana) and dapagliflozin (Jardiance). They have the suffix 'gliflozin'.
5-HT1B/1D Agonists (Triptans)
Triptans constrict cranial blood vessels by binding to specific serotonin receptors.
Used for migraine headaches, these agonists bind to serotonin (5-HT) 1B and 1D receptors on cranial blood vessels, causing vasoconstriction, which relieves migraine pain. Examples include sumatriptan (Imitrex) and rizatriptan (Maxalt). The suffix is 'triptan'.
5-HT3 Antagonists
5-HT3 antagonists block serotonin receptors in the brainstem that trigger nausea and vomiting.
These drugs are used to treat nausea and vomiting. They work by blocking serotonin receptors in the brainstem that can induce these symptoms. An example is ondansetron (Zofran).
Sulfonamides
Sulfonamides inhibit bacteria's folic acid synthesis, making them bacteriostatic.
These are sulfa antibiotics used for various bacterial infections. They inhibit the bacteria's ability to synthesize folic acid, which is essential for reproduction, making them bacteriostatic. A common example is sulfamethoxazole with trimethoprim (Bactrim, Septra), where the combination is bactericidal.
Sulfonylureas
Sulfonylureas increase insulin release from the pancreas's beta cells.
Used for diabetes, these drugs stimulate the beta cells in the pancreas to release more insulin. Examples include glipizide (Glucotrol) and glyburide (Diabeta, Glynase).
Thiazides
Thiazide diuretics decrease sodium and fluid reabsorption in the kidneys, increasing urine output.
These diuretics are used for high blood pressure and swelling. They work by reducing sodium reabsorption in the kidneys, which also decreases fluid reabsorption, leading to increased urine output and lower blood pressure. Examples include hydrochlorothiazide (Microzide) and chlorthalidone (Hygroton).
TNF Inhibitors
TNF inhibitors block the action of tumor necrosis factor, reducing inflammation in autoimmune diseases.
These biologics are used for inflammatory conditions like psoriasis, rheumatoid arthritis, and Crohn's disease. They block the action of TNF, an inflammatory cytokine produced early in the immune response, thereby reducing inflammation. Many end in 'mab' (monoclonal antibody), like adalimumab (Humira) and infliximab (Remicade).
TCAs (Tricyclic Antidepressants)
TCAs block serotonin and norepinephrine reuptake and also affect acetylcholine and histamine.
Used for depression, nerve pain, and migraine prevention, TCAs block the reuptake of serotonin and norepinephrine. They also affect acetylcholine and histamine levels, which contribute to their use in other conditions. Examples include amitriptyline (Elavil) and nortriptyline (Pamelor).
Tetracyclic Antidepressants (TeCAs)
TeCAs increase levels of serotonin or norepinephrine and affect other neurotransmitters.
Used for depression, these drugs increase levels of serotonin or norepinephrine and also influence other neurotransmitters like histamine. Mianserin (Remeron) is an example.
Tetracyclines
Tetracyclines disrupt bacterial protein synthesis, inhibiting bacterial growth.
These antibiotics are used for a wide range of bacterial infections. They disrupt bacterial protein synthesis. Doxycycline (Vibramycin, Doryx) is a common example.
Tubulin Disruptors
Tubulin disruptors block neutrophil-mediated inflammatory responses in gout.
Used for the prevention and treatment of gout, these drugs block the neutrophil-mediated inflammatory response caused by uric acid. Colchicine (Colcrys) is an example.
TZDs (Thiazolidinediones)
TZDs increase cellular sensitivity to insulin, thus decreasing insulin resistance.
Used for diabetes, TZDs work by increasing the sensitivity of body cells to insulin, thereby decreasing insulin resistance. Examples include pioglitazone (Actos) and rosiglitazone (Avandia). They end in the suffix 'glitazone'.
Vitamin K Antagonists
Vitamin K antagonists block vitamin K's role in the blood clotting process.
Used for the prevention and treatment of blood clots, these drugs interfere with vitamin K, which is essential for the blood clotting cascade. Warfarin (Coumadin) is the primary example. Dietary vitamin K intake and regular INR testing are critical for effective and safe use.
Xanthine Oxidase Inhibitors
Xanthine oxidase inhibitors reduce the body's production of uric acid.
These drugs are used for the prevention of gout. They work by decreasing the amount of uric acid the body produces. Allopurinol (Zyloprim) is a common example.
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