Drugs Flashcards
Procainamide
- Ia
- Blocks INa and partially blocks IKr, slowing the action potential upstroke and prolonging the action potential duration
- Termination of sustained ventricular tachycardia (not first line). Ventricular tachycardia after MI (rarely used for this).
- Drug-induced lupus, only during long term oral use (not available PO in USA). Fever. Agranulocytosis
Quinidine
- Ia
- Blocks INa and partially blocks IKr, slowing the action potential upstroke and prolonging the action potential duration. Also binds the M2 muscarinic receptor for vagolytic effects
- Converts atrial fibrillation or flutter to sinus rhythm (rarely used for this). Maintain sinus rhythm in patients with atrial fibrillation (but can raise mortality)
- Cinchonism (CNS toxicity: tinnitus, hearing loss, delirium, and psychosis). Nausea, vomiting, diarrhea
Disopyramide
- Ia
- Blocks INa and blocks IKr, slowing the action potential upstroke and prolonging the action potential duration. Also binds the M2 muscarinic receptor for vagolytic effects (stronger than quinidine)
- Hypertrophic obstructive cardiomyopathy (but not commonly used)
- Antimuscarinic side effects (urinary retention, constipation, blurred vision, dry mouth, closed-angle glaucoma)
Lidocaine
- Ib
- Binds INa+ channel in active and inactive states, but not in the resting state. So it has little effect in normal tissue, but does exert effects in sick (ischemic) tissue.
- Ventricular arrhythmias, particular post-MI
- CNS toxicity: confusion, delirium, paresthesias, grand mal seizures
Mexiletine
- Ib
- Binds INa+ channel in active and inactive states, but not in the resting state. So it has little effect in normal tissue, but does exert effects in sick (ischemic) tissue.
- Chronic suppression of ventricular arrhythmias (not first line, but sometimes)
- Nausea, vomiting
Flecainide
- Ic
- Sodium channel blocker, prolongs conduction time. Has negative inotropic effects
- Acute conversion of atrial fibrillation to sinus rhythm. Maintenance of sinus rhythm in atrial fibrillation. Suppression of premature ventricular contractions (rarely used for this, raises mortality).
- Confusion, irritabilityIcSodium channel blocker, prolongs conduction time. Has negative inotropic effects
- Acute conversion of atrial fibrillation to sinus rhythm. Maintenance of sinus rhythm in atrial fibrillation. Suppression of premature ventricular contractions (rarely used for this, raises mortality).Confusion, irritability
Propafenone
- Ic
- Sodium channel blocker, some β-blocking activity, negative inotropic effects
- Acute conversion of atrial fibrillation to sinus rhythm. Maintenance of sinus rhythm in atrial fibrillation. Suppression of premature ventricular contractions (rarely used for this, raises mortality).
- Can exacerbate bronchospasm (β-blocker…)
Beta-blockers
- II
- Decrease slope of phase 4 in the SA node, and decrease the upstroke velocity in the SA and AV node, slowing conduction
- Slowing of ventricular response in atrial fibrillation. Disrupting reentrant arrhythmias. Suppressing premature ventricular contractions or atrial premature beats
- Bronchospasm, depression, cognitive impairment, hypotension
Amiodarone
- III
- Blocks potassium channels, increases action potential duration and effective refractory period. Also blocks Na+ channels, β receptors, and Ca2+ channels (class I, II, and IV-like effects). Most effective, but has significant side effects.
- Suppression of ventricular tachycardia (defibrillators more effective). Maintenance of sinus rhythm in atrial fibrillation/flutter. Acute conversion from atrial fibrillation to sinus rhythm.
- Hyperthyroidism and hypothyroidism. Pulmonary fibrosis, liver toxicity, photodermatitis (grayish-blue skin discoloration). Dronedarone, a congener, has fewer side effects.
Sotalol
- III
- Blocks K+ channels with some β-blocking activity
- Maintenance of sinus rhythm in atrial fibrillation/flutter. Prevention of AVNRT, AVRT. Ventricular tachyarrhythmias.
- Similar side effects to β-blockers: bronchospasm, depression, hypotension, cognitive impairment
Dofetilide
- III
- Blocks K+ channels, and some Na+ channel blocking activity
- Maintenance of sinus rhythm in atrial fibrillation/flutter
- Headaches, GI complaints
Ibutilide
- III
- K+ channel blocker
- Acute termination of atrial fibrillation and atrial flutter
- Few extracardiac effects other than GI complaints
Verapamil
- IV
- Ca2+ channel blockers, block L-type channels and prolong conduction time and refractory periods in the AV node
- Heart rate control in atrial fibrillation/flutter. Can be used to terminate supraventricular tachycardias.
- Constipation and peripheral edema (from smooth muscle interference in gut and vasodilation, respectively), hypotension
Adenosine
- Unclassified
- Interacts directly with A1 adenosine receptors in the heart, activating K+ channel, indirectly decreasing L-type Ca2+ channel activity and the funny current, If. Causes marked hyperpolarization and transient elective heart block.
- Diagnosis and termination of supraventricular tachycardias by producing transient heart block. Effective in terminating reentrant rhythms (acts as a reset button).
- Transient flushing, chest pressure, and chest burning
Digoxin
- Unclassified
- Complicated mechanism: direct membrane effects (mediated by blocking Na+/K+ ATPase), and indirect effects (vagomimetic). Slows conduction, mainly in the SA node, atria, and AV node.
- Control of ventricular response in atrial fibrillation/flutter (usually with a β-blocker or Ca2+ channel blocker)
- Yellow vision, anorexia, nausea, vomiting, disorientation, hallucination. Toxicity treated with anti-digoxin antibody fragments
Aspirin
- Platelet aggregation inhibitor
- Acetylates cyclooxygenase, irreversibly inhibiting it. Prevents production of ThromboxaneA2 (platelet activator)
- Function returns to normal after 7-10 days when new platelets appear in circulation.
NSAIDs
- Platelet aggregation inhibitor
- Reversibly inhibits cyclooxygenase, function returns when drug concentration falls.
Clopidogrel
- Platelet aggregation inhibitor
- P2Y12 ADP receptor blocking agent, can be used with aspirin. Needs to be activate, some people resistant.
- Trade name: Plavix
Ticlopidine
- Platelet aggregation inhibitor
- ADP receptor blocking agent
- Trade name: Ticlid, use is associated with increased incidence of Thrombotic Thrombocytopenic Purpura (TTP) in 1:2000-4000 patients
Prasugrel
- Platelet aggregation inhibitor
- ADP receptor blocking agent, used in patients resistant to clopidogrel
- Trade name: Efient
Ticagrelor
- Platelet aggregation inhibitor
- ADP receptor blocking agent, used in patients resistant to clopidogrel
- Trade name: Brilinta
Abciximab
- Platelet aggregation inhibitor
- Humanized murine Fab monoclonal antibody binds to and inhibits GP IIb/IIIa function
- Trade name: ReoPro
Dipyridamole
- Platelet aggregation inhibitor
- Inhibits adenosine uptake, acts on PLA2, causes increased platelet cAMP, leading to inhibition
- Trade name: Persantine
Warfarin
- Vitamin K Antagonist
- Inhibits vitamin K epoxide reductase (VKORC1)Anticoagulant
- Trade name: Coumadin
Low Molecular Weight Heparin
- Heparin
- Enhanced inactivation of factor Xa relative to heparin
- Anticoagulant
- Reduced incidence of heparin induced thrombocytopenia, and reduced risk of osteoporosis. Can also be self-administered.
Heparin
- Heparin
- Lower molecular weight inhibits Xa, higher molecular weight inhibits thrombin and binds platelets. All enhance antithrombin activity.
- Anticoagulant
- Can cause heparin induced thrombocytopenia, and osteoporosis (when used chronically), can be self administered.
Fondaparinux
- Synthetic heparin analog
- Enhances ability of antithrombin to inhibit factor Xa, but no anti-thrombin activity.
- Anticoagulant
- Trade name: Arixtra. No thrombocytopenia, but cannot be used in patients in renal failure.
Rivaroxaban
- Direct Factor Xa Inhibitor
- Small molecule inhibitor of factor Xa (free and bound)
- Anticoagulant
- Trade name: Xarelto, monitoring not required
Apixiban
- Direct Factor Xa Inhibitor
- Small molecule inhibitor of factor Xa (free and bound)
- Anticoagulant
- Trade name: Eliquis, monitoring not required
Hirudin
- Direct Thrombin Inhibitor
- Binds both the active pocket site and fibrinogen binding exosite on thrombin.
- Anticoagulant
- Originally derived from leeches, now made with recombinant DNA technology
Bivalirudin
- Direct Thrombin Inhibitor
- Binds both the active pocket site and fibrinogen binding exosite on thrombin, but is a truncated version of hirudin
- Anticoagulant
- Need to test activated clotting time at 45 minutes, avoid in renal failure
Argatroban
- Direct Thrombin Inhibitor
- Binds only the active site pocket on thrombin
- Anticoagulant
- Need to test APTT at 2 hours, avoid in liver failure
Dabigatran
- Direct Thrombin Inhibitor
- Binds only the active site pocket on thrombin
- Anticoagulant
- Dabigatran etexilate (trade name: Pradaxa) is a prodrug that is converted to dabigatran in the gut, does not need to be monitored
Lepirudin
- Direct Thrombin Inhibitor
- Binds only the active site pocket on thrombin
- Anticoagulant
- Need to test APTT at 2 hours, avoid in renal failure
Atorvastatin
- Statin
- Inhibits HMG CoA Reductase, decreasing cholesterol synthesis. Leads to increased LDL receptors
- High intensity (40/80 mg/day), moderate intensity (10 mg/day)CYP3A4
Rosuvastatin
- Statin
- Inhibits HMG CoA Reductase, decreasing cholesterol synthesis. Leads to increased LDL receptors
- High intensity (20/40 mg/day), moderate intensity (5/10 mg/day)
- Minimally metabolized by CYP2C9
Pravastatin
- Statin
- Inhibits HMG CoA Reductase, decreasing cholesterol synthesis. Leads to increased LDL receptors
- Moderate intensity (40 mg/day)
- Not metabolized by CYPs
Simvastatin
- Statin
- Inhibits HMG CoA Reductase, decreasing cholesterol synthesis. Leads to increased LDL receptors
- Moderate intensity (40 mg/day)CYP3A4
Fluvastatin
- Statin
- Inhibits HMG CoA Reductase, decreasing cholesterol synthesis. Leads to increased LDL receptors
- Moderate intensity (40/80XL mg/day)
- CYP2C9
Pitavastatin
- Statin
- Inhibits HMG CoA Reductase, decreasing cholesterol synthesis. Leads to increased LDL receptors
- Moderate intensity (2-4 mg/day)Longest half-life, tolerated in HIV patients, not well studied
Lovastatin
- Statin
- Inhibits HMG CoA Reductase, decreasing cholesterol synthesis. Leads to increased LDL receptors
- Moderate intensity
Cholestryamine
- Bile Acid Binding Sequestrant (resin)
- Binds bile acids in the gut, causing depletion of hepatic cholesterol pools and increased production of LDL receptors. Lower LDL ~20%
- Very safe, non-systemic, but cannot be used if triglycerides >250
Colestipol
- Bile Acid Binding Sequestrant (resin)
- Lower LDL ~20%
- Very safe, non-systemic, but cannot be used if triglycerides >250
Colesevelam
- Bile Acid Binding Sequestrant (gel)
- Lower LDL ~20%
- Very safe, non-systemic, but cannot be used if triglycerides >250
Ezetimibe
- Cholesterol absorption inhibitor
- Absorbed, glucuronidated, and then localizes to the intestinal villi, preventing absorption of cholesterol
- Lower LDL ~20%
- Useful in combination with a moderate intensity statin
Stanol ester
- Plant Stanol/Sterol Ester
- Inhibit micellar cholesterol absorption
- Lower LDL 10-14%
Niacin
- Vitamin B3
- Potent inhibitor of adipose tissue lipolysis by activating GPR109A (a GPCR). This decreases flux of free fatty acids to the liver for VLDL production
- Lowers LDL and VLDL, raises HDL
- No measurable benefit when added to a statin. Take aspirin before niacin to avoid cutaneous vasodilation and flushing.
Gemfibrozil
- Fibrate
- Doubt we need, he cited a paper
- Lowers LDL if LDL is high alone. LDL elevated if not high already. Increases HDL if baseline levels are low.
- Can cause cholelithiasis and mild GI symptoms
Fenofibrate
- Fibrate
- Doubt we need, he cited a paper
- Lowers LDL if LDL is high alone. LDL elevated if not high already. Increases HDL if baseline levels are low.
- Can cause cholelithiasis and mild GI symptoms
Omega 3 Fatty Acids
- Inhibit hepatic production and utilization of triglyceride rich particles
- Lower TG in a dose-dependent fashion (up to 50% in pt with very high TG). Slightly increase HDL, do nothing for LDL.
- No consistent evidence in RCT
Furosemide
- Loop Diuretic
- Inhibit the Na-K-2Cl symporter in the thick ascending loop of Henle
- Rapid diuresis, HTN in CKD
- Hypokalemia, hypocalcemia, hypomagnesemia, increased LDL and triglycerides, hyperglycemia
Torsemide
- Loop Diuretic
- Inhibit the Na-K-2Cl symporter in the thick ascending loop of Henle
- Rapid diuresis, HTN in CKD
- Hypokalemia, hypocalcemia, hypomagnesemia, increased LDL and triglycerides, hyperglycemia
Ethycrinic Acid
- Loop Diuretic
- Inhibit the Na-K-2Cl symporter in the thick ascending loop of Henle
- Rapid diuresis, HTN in CKD
- Ototoxicity, hypokalemia, hypocalcemia, hypomagnesemia, increased LDL and triglycerides, hyperglycemia
Hydrochlorothiazide (HCTZ)
- Thiazide Diuretic
- Inhibit the Na-Cl symporter in the distal convoluted tubule
- First line hypertension
- Hypokalemia, hyponatremia, hypercalcemia, impotence, impaired glucose tolerance, increased cholesterol
Chlorthalidone
- Thiazide Diuretic
- Inhibit the Na-Cl symporter in the distal convoluted tubule
- First line hypertension
- Hypokalemia, hyponatremia, hypercalcemia, impotence, impaired glucose tolerance, increased cholesterol
Chlorthiazide, metolazone
- Thiazide Diuretic
- Inhibit the Na-Cl symporter in the distal convoluted tubule
- First line hypertension
- Hypokalemia, hyponatremia, hypercalcemia, impotence, impaired glucose tolerance, increased cholesterol
Trimterene
- Potassium Sparing Diuretic
- Inhibits renal epithelial Na channels in the late distal tubule and collecting duct
- Diuretic, generally an add-on therapy with another diuretic class
- Hyperkalemia, nausea, vomiting
Spironolactone
- Potassium Sparing Diuretic
- Antagonizes the mineralcorticoid (aldosterone) receptor on epithelial cells in the late distal tubule and cortical collecting duct
- Diuretic, generally an add-on therapy with another diuretic class
- Hyperkalemia, gynecomastia
Eplerenone
- Potassium Sparing Diuretic
- Antagonizes the mineralcorticoid receptor (aldosterone) on epithelial cells in the late distal tubule and cortical collecting duct
- Diuretic, generally an add-on therapy with another diuretic class
Amiloride
- Potassium Sparing Diuretic
- Inhibits renal epithelial Na channels in the late distal tubule and collecting duct
- Diuretic, generally an add-on therapy with another diuretic class
- Hyperkalemia, nausea, vomiting
Nitroglycerin
- IV Vasodilator
- Primarily a venodilator
Nitroprusside
- IV Vasodilator
- Metabolized by blood vessels to nitric oxide, causing vasodilation.
- Lower blood pressure in difficult patients or emergencies. Mixed venous and arterial vasodilator
- Hypotension, cyanide and thiocyanate toxicity. IV only
Nesiritide
- IV Vasodilator
- Primarily an arteriolar dilator
Minoxidil
- Peripheral vasodilator
- Activates a potassium channel in vascular smooth muscle, causing K efflux. This hyperpolarizes the cell and relaxes it.
- Lower blood pressure in difficult patients
- Water and sodium retention, tachycardia/angina/heart failure, hypertrichosis, effusions
Hydralzaine
- Oral Vasodilator
- Causes arteriolar smooth muscle to relax
- Lower blood pressure in difficult patients or emergencies. Pure arterial vasodilator
- Headache, nausea, flushing, dizziness, angina, edema. Can cause reflex tachycardia. Drug induced lupus. IV or oral
Nitrates
- Oral Vasodilator
- Pure venodilator
- Can cause reflex tachycardia
ACE inhibitors (-opril/-april/-epril/-ipril)
- Oral Vasodilator
- Block conversion of angiotensin I to angiotensin II, decreasing sympathetic activation, relaxing smooth muscles, causing diuresis, and increasing bradykinin (vasodilation)
- Cough, hyperkalemia, renal failure, angioedema, teratogenic!
Angiotensin receptor blocker (-artan)
- Oral Vasodilator
- Block the angiotensin II receptor (AT1), decreasing sympathetic activation, relaxing smooth muscles, and causing diuresis
- Hyperkalemia, renal failure, teratogenic!
Dobutamine
- Inotrope
- Beta I and B2 agonist
Dopamine
- Inotrope
- B1 agonist
Norepinephrine
- Inotrope
- B1 agonist
Milrinone
- Inotrope
- Phsophodiesterase inhibitor
Digoxin
- Inotrope
- Complicated mechanism: direct membrane effects (mediated by blocking Na+/K+ ATPase), and indirect effects (vagomimetic). Slows conduction, mainly in the SA node, atria, and AV node.
- Control of ventricular response in atrial fibrillation/flutter (usually with a β-blocker or Ca2+ channel blocker)
- Yellow vision, anorexia, nausea, vomiting, disorientation, hallucination. Toxicity treated with anti-digoxin antibody fragments
Atenolol
- Beta blocker
- Cardioselective, blocks the B1 receptor
- Basically, decrease CO. Decreasing HR, decreased contractility, and decreased renin release. Used in patients with CAD, and for hypertension (but not as the sole agent)
- Bradycardia, hyperkalemia, fatigue, cold extremeties, bronchospasm.
Metoprolol
- Beta blocker
- Cardioselective, blocks the B1 receptor
- Basically, decrease CO. Decreasing HR, decreased contractility, and decreased renin release. Used in patients with CAD, and for hypertension (but not as the sole agent)
- Bradycardia, hyperkalemia, fatigue, cold extremeties, bronchospasm.
Propanolol
- Beta blocker
- Blocks the B1 and B2 receptors
- Basically decrease CO. Decreasing HR, decreased contractility, and decreased renin release. Also causes vasoconstriction and a slight increase in PVR. Used in patients with CAD, and for hypertension (but not as the sole agent)
- Bradycardia, hyperkalemia, fatigue, cold extremeties, bronchospasm.
Timolol
- Beta blocker
- Blocks the B1 and B2 receptors
- Basically decrease CO. Decreasing HR, decreased contractility, and decreased renin release. Also causes vasoconstriction and a slight increase in PVR. Used in patients with CAD, and for hypertension (but not as the sole agent)
- Bradycardia, hyperkalemia, fatigue, cold extremeties, bronchospasm.
Methyldopa
- Centrally acting agent
- Replaces norepinephrine in secretory vesicles in adrenergic neurons. Acts centrally on the brain to inhibit central adrenergic outflow.
- Useful for hypertension in pregnancy, but many side effects
- Sedation, dry mouth, fatigue, depression, liver toxicity
Clonidine
- Centrally acting agent
- Stimulates a2 receptors in the brain, decreasing PVR to lower BP
- Used adjunctively due to side effects, has few interactions with other drugs
- Sedation, dry mouth, sleepiness, bradycardia, fatigue, depression, liver toxicity. Can get withdrawal symptoms if stopped suddenly.
a1 blockers (-zosin)
- a1 blocker
- Blocks the a1 receptor (postsynaptic), causing vasodilation.
- Hypertension, decreases total peripheral resistance and BP
Verapamil
- Calcium channel blocker (phenylalkylamine)
- Block the L-type calcium channel (mostly cardiac), relaxing smooth muscle
- Hypertension, greatly reduces PVR. Good in patients with diabetes, renal insufficiency, lipid problems, and asthma.Constipation, dizziness, nausea, bradycardia
Diltiazem
- Calcium channel blocker (Benzothiazepine)
- Block the L-type calcium channel (vascular and cardiac), relaxing smooth muscle
- Hypertension, decreases cardiac output and PVR. Good in patients with diabetes, renal insufficiency, lipid problems, and asthma.
- Edema, headache, nausea, dizziness, diarrhea, bradycardia
Nifedipine
- Calcium channel blocker (Dihydropyridine)
- Block the L-type calcium channel (primarily in smooth muscle), relaxing smooth muscle
- Hypertension, decreases cardiac output and PVR. Good in patients with diabetes, renal insufficiency, lipid problems, and asthma.
- Peripheral edema, headaches, flushing, dizziness, GERD, constipation
Amlodipine
- Calcium channel blocker (Dihydropyridine)
- Block the L-type calcium channel (primarily in smooth muscle), relaxing smooth muscle
- Hypertension, decreases cardiac output and PVR. Good in patients with diabetes, renal insufficiency, lipid problems, and asthma.
- Peripheral edema, headaches, flushing, dizziness, GERD, constipation
PCSK9 Inhibitors
- Disinhibit LDLR
- Dec LDL
- Myalgias, Delerium, Dementia
Alteplase (tPa)
- Act plasminogenShort t1/2
- Higher fibrin specificity
- Direct plasminogen activation
Tenecteplase (TNK-tPa)
- Act plasminogen
- Higher fibrin specificity
- Direct plasminogen activation
Streptokinase
- Act plasminogen
- Antigenic
Ranolazine
- Inhibit late, inward Na current -> less Na/Ca exchange in ischemic tissue -> less Ca overload
- Safe with other anti-ischemic drugs and if low HR/BP
Aliskiren
Inhibit renin