Inhibits reabsorption of sodium and chloride at the distal renal tubules (blocking the
chloride pump), increasing the excretion of sodium, chloride, and water by kidneys
Hydrochlorothiazide Indications
-edema w/ HF, cirrhosis, corticosteroid or estrogen therapy, renal dysfunction
-HTN (or w/ combination); 1st line drug to treat HTN!!
Hydrochlorothiazide Pharmacokinetics
-administered via oral route, onset is 2 hours
-peak effects occur 4-6 hours after administered
-lasts up to 12 hrs after administration (6-12 hrs)
-is excreted in urine almost entirely unchanged
Hydrochlorothiazide Adverse Effects
-hypokalemia
,-hypotension
-long-term use: hyperglycemia
-dizziness/vertigo
-orthostatic hypotension
-electrolyte imbalances/alterations
-nausea & vomiting
-anorexia (not eating)
-dry mouth
-diarrhea
-dehydration -> hypovolemia!!
-diarrhea
-polyuria & nocturia
-muscle cramps/spasms (low K-)
Hydrochlorothiazide Half-life
,-5.6 to 14 hours
-metabolized in liver & excreted in urine
Thiazide diuretics end in:
-thiazide
Hydrochlorothiazide Drug-Drug Interactions
-Increased risk of digoxin/quinidine/lithium toxicity
-Decreased effectiveness of antidiabetic agents
Hydrochlorothiazide Contraindications/Cautions
Contraindications:
-allergy to thiazide/sulfonamides
-hypovolemia
-severe renal disease
Cautions:
-SLE
-glucose tolerance abnormalities
, -gout
-liver disease
-hyperparathyroidism
-bipolar disorder
-pregnancy & lactation
Furosemide (Lasix) (prototype)
Loop Diuretic
Loop diuretics end in:
-semide
Furosemide MOA
blocks active reabsorption of sodium & chloride-producing drugs, having a blocking
action on the chloride pump from distal renal tubules and the loop of Henle. Results are
sodium-rich diuresis
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