Pharmacology Flashcards
Angiotensin converting enzyme inhibitors
Captopril, Enalapril, lisinopril, Ramipril
ACE inhibitor MOA
Inhibit ACE decreasing AT II leading to dilation of efferent arteriole which decreases GFR
ACE inhibitor contraindications
C1 esterase inhibitor deficiency
Bilateral renal artery stenosis - leads to renal failure
ACE inhibitor side effects
Cough, Angioedema, Teratogen, increased Creatinine, Hyperkalemia and Hypotension
Benefit of ACE inhibitor in chronic kidney disease
Decreases intraglomerular pressure slowing GBM thickening
ATII receptor blockers
Losartan, candesartan, valsartan
ATII receptor blockers MOA
Selectively block AT1 receptors
Cause of cough with ACE inhibitors
ACE inhibitors prevent breakdown of bradykinins
Benefit of ATII receptor blockers over ACE inhibitors
Do not increase bradykinin levels
Indications for ACE inhibitors
HTN, HF, proteinuria, diabetic nephropathy
Benefits of ACE inhibitors in heart disease
Decrease mortality in HF and prevent unfavorable heart remodeling as a result of chronic HTN
Indications for ATII receptor blockers
HTN, HF, proteinuria, CKD with ACE inhibitor intolerance
ATII receptor blockers side effects
Hyperkalemia, decreased GFR, HoTN, teratogen
Aliskiren MOA
Blocks conversion AT-I to AT-II by blocking renin
Aliskiren indications
HTN
Aliskiren side effects
Hyperkalemia, decreased GFR, HoTN, angioedema
Aliskiren contraindications
In those already taking ACE inhibitors or ARBs
Thiazide diuretics
Hydrochlorothiazide, chlorthalidone, metolazone
Thiazide diuretics MOA
Inhibit NaCl reabsorption in DCT decreasing diluting capacity of nephron
Thiazide diuretics indications
HTN, HF, idiopathic hypercalciuria, nephrogenic diabetes insipidus, osteoporosis
Thiazide diuretics side effects
Hypokalemic metabolic alkalosis, hyponatremia, hyperglycemia, hyperlipidemia, hyperuricemia, hypercalcemia
Thiazide diuretics contraindications
Sulfa allergy
Potassium sparing diuretics
Spironolactone and Eplerenone; Triamterene and Amiloride
Spironolactone and Eplerenone MOA
Competitive aldosterone receptor antagonists in cortical collecting tubule
Triamterene and Amiloride MOA
Block Na channels in cortical collecting tubule
Potassium sparing diuretics indications
Hyperaldosteronism, K depletion, HF, antiandrogen
Additional indication for spironolactone
Hepatic ascites
Additional indication for amiloride
Nephrogenic diabetes insipidus
Potassium sparing diuretics side effects
Hyperkalemia - causes arrhythmias
Spironolactone side effects
Gynecomastia and antiandrogen effects
What may urine electrolyte may increase with all diuretics
Urine NaCl - serum NaCl decreases too
What may urine electrolyte may increase with thiazide diuretics
Potassium - serum K decreases too
Mechanism for alkalemia in loop diuretics
- Volume contraction - increased AT-II increases Na/H+ exchange in PCT increasing HCO3- reabsorption
- K loss causes H-K shift K out and H+ into cells
- Low K state H+ exchanged for Na - also causes paradoxical aciduria
Mechanism for acidemia in carbonic anhydrase inhibitors
Decreased HCO3 reabsorption
Mechanism for acidemia K-sparing diuretics
Aldosterone blockade prevents K and H+ secretion
Mechanism for acidemia in hyperkalemia
H-K shift moves K in and H+ out of cells
Mechanism for increased urine Ca with loop diuretics
Decreased paracellular Ca reabsorption causes hypocalcemia
Mechanism for decreased urine Ca with thiazide diuretics
Enhanced Ca reabsorption
Osmotic diuretic which increases tubular fluid osmolarity leading to increased urine flow and used to treat increased ICP/intraocular pressure
Mannitol
Indications for mannitol
Drug overdose and increased ICP/intraocular pressure
Mannitol side effects
Pulmonary edema, dehydration
Mannitol contraindications
Anuria and HF
Carbonic anhydrase inhibitor
Acetazolamide
Acetazolamide MOA
Causes self limited NaHCO3 diuresis and decreased total body stores of HCO3- stores
Acetazolamide indications
Glaucoma, urinary alkalinization, metabolic alkalosis, altitude sickness, pseudotumor cerebri
Acetazolamide side effects
Proximal renal tubular acidosis, paresthesias, NH3 toxicity, hypokalemia, sulfa allergy
Loop diuretics
Furosemide, bumetanide, torsemide
Loop diuretics MOA
Sulfonamide loop diuretics inhibit Na/K/2Cl of thick ascending limp of loop of Henle preventing concentration of urine
Loop diuretics side effects
Ototoxicity, Hypokalemia, Hypomagnesemia, Dehydration, Allergy (sulfa), metabolic Alkalosis, Nephritis, Gout
Loop diuretics indications
Edematous state, HTN, hypercalcemia
Non-sulfonamide inhibitor of Na/K/2Cl of thick ascending limb of loop of Henle
Ethacrynic acid
Ethacrynic acid indications
Diuresis of patients allergic to sulfa drugs
Ethacrynic acid side effects
Same as loop diuretics but more ototoxic