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Drug Class Examples Mechanism of Action Indications Contraindications
ARNI Sacubitril-Valsartan Inhibits neprilysin + blocks angiotensin II HFrEF ACEi within 36h (washout period), angioedema
ACE/ARBs Ramipril, Perindopril, Telmisartan, Losartan Inhibits RAAS HTN, HF, post-MI, CKD Pregnancy, angioedema, bilateral RAS
MRA Spironolactone Aldosterone receptor antagonist HFrEF, hyperaldosteronism, resistant HTN Hyperkalemia, renal failure
SGLT2 Inhibitors Dapagliflozin, Empagliflozin, Canagliflozin Blocks glucose reabsorption in proximal tubule HFrEF, T2DM, CKD Recurrent UTIs, DKA, severe renal impairment
DOACs Apixaban, Rivaroxaban, Edoxaban Direct Xa or thrombin inhibition AF, DVT/PE Mechanical valve, severe renal/liver disease
Warfarin Warfarin Vitamin K epoxide reductase inhibitor AF, DVT/PE, mechanical valves Pregnancy, bleeding, poor adherence
Heparins (UFH/LMWH) Heparin, Enoxaparin, Dalteparin Potentiates antithrombin III ACS, VTE, bridging HIT, active bleeding, AKI (for LMWHH)
Antiplatelets Aspirin, Ticagrelor, Clopidogrel, Prasugrel Inhibits platelet aggregation (COX-1, P2Y12) ACS, post-PCI, stroke prevention Active bleeding, ASA allergy
CCB (DHP & non-DHP) Amlodipine, Verapamil, Diltiazem Blocks L-type calcium channels HTN (DHP), AF (non-DHP), angina HFrEF (non-DHP), bradycardia
Loop Diuretics Furosemide Inhibits Na-K-2Cl in thick ascending loop HF, volume overload, hyperkalemia Hypovolemia, severe electrolyte disturbance
Thiazides Diuretics Hydrochlorothiazide, Indapamide Inhibits Na-Cl in DCT HTN, mild edema Gout, hyponatremia, sulfa allergy
K-Sparing Diuretics Amiloride Blocks ENaC or aldosterone receptor K-sparing combo with loop/thiazide diuretics Hyperkalemia, renal impairment
Class I Antiarrhythmic (Na-Blockers) Flecainide, Procainamide Blocks fast Na channels in myocardium AF, VT (selected cases) Structural heart disease, QT prolongation
Class II Antiarrhtymic (Beta Blockers) Metoprolol, Carvedilol, Bisoprolol Blocks β-adrenergic receptors HTN, HF, angina, arrhythmias, post-MI Asthma, bradycardia, heart block
Class III Antiarrhythmic (K-Blockers) Amiodarone, Sotalol Blocks K+ channels → prolongs repolarization AF, VT, VF Thyroid/lung disease (amio), QT prolongation
Class IV Antiarrhythmic (CCB - non-DHP) Verapamil, Diltiazem Blocks L-type Ca channels in AV node Rate control in AF HFrEF, bradycardia, AV block
Statins Atorvastatin, Rosuvastatin Inhibits HMG-CoA reductase Dyslipidemia, ASCVD prevention Pregnancy, liver disease
Ezetimibe Ezetimibe Inhibits intestinal cholesterol absorption Add-on to statins Liver disease
PCSK9 Inhibitors Evolocumab, Alirocumab ↑ LDL receptor recycling → ↓ LDL Familial hypercholesterolemia, high-risk ASCVD Hypersensitivity, cost
Inotropes Dobutamine, Dopamine β-agonists → ↑ contractility Cardiogenic shock, acute HF Tachyarrhythmias
Inodilators Milrinone PDE-3 inhibition → ↑ inotropy + vasodilation Decompensated HF Hypotension, arrhythmias
Vasodilators Nitroglycerin, Hydralazine Smooth muscle relaxation → ↓ preload/afterload Angina, HTN, acute HF Hypotension, PDE-5 inhibitor use
Vasopressors Norepinephrine, Epinephrine α/β stimulation → ↑ SVR and/or CO Shock (e.g., septic, cardiogenic) Untreated hypovolemia