Pharm One Liners High Yield Flashcards
Time it takes for amount of drug to fall to half of its value, constant in first order kinetics (majority of drugs)
Half-life (T1/2)
Rifampin, phenobarbital, phenytoin, carbamazepine, St. Johns wort
Inducers of CYP450 (particularly CYP3A4)
Ritonavir (protease inhibitors), cimetadine, macrolides, ketoconazole (azoles), quinidine, amiodarone, grapefruit juice
Inhibitors of CYP450 (particularly CYP3A4)
Ability of drug to produce the maximal biologic effect
Efficacy
Mechanism of action utilizes intracellular receptors
Steroid and hormones
Mechanism of action utilizes transmembrane receptors that have intrinsic enzymatic activity
Insulin, EGF, TGFbeta, PDGF, ANP
Antidote for organophosphate/anticholinesterase poisoning
Atropine, pralidoxime (2-PAM)
Antidote acetaminophen poisoning
N-acetylcysteine
Antidote used for heparin toxicity
Protamine sulfate
Antidote used for warfarin toxicity
Vitamin K1 and fresh frozen plasma
Antidote for tissue plasminogen activator (t-PA), streptokinase
Aminocaproic acid
Antidote for opioid toxicity
Naloxone (IV)
Antidote for benzodiazepine toxicity
Flumazenil
Antidote for methotrexate toxicity
Leucovorin
This agent has greater affinity for muscarinic receptors and used for postoperative and neurogenic ileus and urinary retention
Bethanechol
Toxicity of cholinergics
DUMBELSS (diarrhea, urination, miosis, bronchoconstriction, excitation of skeletal muscle and CNS, lacrimation, salivation, and sweating)
Antimuscarinic that treats Parkinsonism and extrapyramidal disease
Benztropine, trihexyphenidyl
Antimuscarinic for the treatment of motion sickness
Scopolamine
Produce mydriasis and cycloplegia
Atropine, anti-muscarinics
Antimuscarinic that causes bronchodilation in asthma and COPD
Ipratropium, tiotropium
Its ability to vasoconstrict and increase blood pressure makes it useful as local decongestant and for the therapy of spinal shock (temporary maintenance of blood pressure)
Alpha 1 agonists
Alpha 1 agonist toxicity
Hypertension
Selective alpha 1 blocker used for hypertension, benign prostatic hyperplasia, may cause first dose orthostatic hypotension
Prazosin, terazosin, doxazosin
Alpha 1a-selective blocker used for benign prostatic hyperplasia
Tamsulosin
Side effect of alpha blockers
Orthostatic hypotension (especially with first dose) and reflex tachycardia
Selective beta 1 receptor blockers useful for treating cardiac conditions in patients with asthma
Acebutolol, betaxolol, esmolol, atenolol, metoprolol (A BEAM)
Non-selective beta blocker that lacks local anesthetic activity, indicated for glaucoma
Timolol
Side effects of beta blockers
Bradycardia, AV block, impotence, dyslipidemia, exacerbation of COPD
Beta blockers’ effect on the heart in antianginal therapy
Reduce heart rate, blood pressure, contractility, and increase end-diastolic volume
Captopril and enalapril (-PRIL ending) are
ACE inhibitors
Side effects of angiotensin converting enzyme inhibitors
Dry cough, hyperkalemia, angioedema
Inactivated by angiotensin converting enzyme, contributes to dry cough and angioedema
Bradykinin
Angiotensin converting enzyme inhibitors are contraindicated in
Pregnancy, hyperkalemia
Mechanism of action of losartan and valsartan
Block Angiotensin II Type 1 (AT1) Receptors
Side effect associated with angiotensin converting enzyme inhibitors but not angiotensin receptor blockers
Dry cough
Calcium channel blockers with predominate effect on arteriole dilation
Nifedipine, amlodipine, nimodipine (dihydropyridines)
Calcium channel blockers with predominant effect on the heart
Verapamil, diltiazem (non-dihydropyridines)
Side effects of calcium channel blockers
Constipation, peripheral edema, cardiac depression, AV block
Alpha 2 agonist used in pregnant women with hypertension
Methyldopa
Methyldopa is contraindicated in
Geriatrics due to its CNS (depression) effects
Side effect of hydralazine
Lupus-like syndrome
MOA and effect of nitric oxide
Stimulates cGMP, leads to vascular smooth muscle relaxation
Mechanism of action of sildenafil
Inhibits phosphodiesterase-5, which keeps it from degrading cGMP (allowing for smooth muscle relaxation and vasodilation)
Mechanism of action of organic nitrates
Requires an enzymatic process to form NO, relaxes vascular smooth muscle of veins
Mechanism of action of class I antiarrhythmics
Sodium channel blockers
Mechanism of action of class III antiarrhythmics
Potassium channel blockers
Limiting side effect of class Ia and III antiarrhythmics
Prolongs QT interval
Most common side effects of quinidine that limits its use
Cinchonism
Side effect of procainamide
Systemic lupus-like syndrome
Drug of choice for management of acute ventricular tachycardia
Amiodarone
Side effects of Amiodarone
Thyroid dysfunction, corneal deposits, liver damage and pulmonary fibrosis
Life threatening cardiac event that prolong QT leads to
Torsades de pointes
Mechanism of action of statins
inhibits HMG COA reductase
Two side effects of HMG COA reductase inhibitors
Rhabdomyolysis and Hepatotoxicity
Two parameters to obtain before initiation of statins
LFT’s, creatine kinase
How grapefruit juice increases statin effect
Inhibit CYP450 3A4
Fibrates increase activity of
Lipoprotein lipase
Mechanism of action involves indirect reduction of liver triglyceride synthesis
Niacin, fibrates
Side effects of niacin
Cutaneous flush
Side effect of aspirin
GI bleeding
Vitamin K dependent anticoagulant with zero-order kinetics of elimination
Warfarin (PT)
Heparin (PTT) increases activity of
Antithrombin 3
Specific side effect of heparin
Heparin induced thrombocytopenia (HIT)
Mechanism of action of thrombolytics
Lyse thrombi by catalyzing the formation of plasmin which cleaves fibrin
Indications for thrombolytics
Pulmonary embolism, severe deep vein thrombosis
Diuretic used as prophylactic for mountain sickness and glaucoma
Acetazolamide
Side effects of acetazolamide
Alkalization of the urine (precipitate Ca salts), metabolic acidosis, hypokalemia, paresthesias, and encephalopathy in patients with hepatic impairment
Site of action of loop diuretics
Thick ascending limb (NKCC channel)
Side effects of loop diuretics
Hyperuricemia, hypokalemia, metabolic alkalosis and ototoxicity (also hyperglycemia and hypocalcemia)
An electrolyte that is lost in the urine by acute treatment with loop diuretics but can be retained by thiazides
Calcium
Site of action of thiazide diuretics
Early distal convoluted tubule (Na-Cl Symporter)
Side effects of thiazide diuretics
Hyperuricemia, hypokalemia, metabolic alkalosis, hyperlipidemia, and hyperglycemia (also hypercalcemia)
Mechanism of action of amiloride
Inhibit epithelial sodium channels (ENaC) in the distal convoluted tubules and collecting duct
Diuretic used to treat primary aldosteronism
Spironolactone, eplerenone
Side effect of spironolactone
Gynecomastia, hyperkalemia, and impotence
Diuretic used to reduce intracranial pressure
Mannitol