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CARDIOVASCULAR SYSTEM › BETA BLOCKING AGENTS › BETA BLOCKING AGENTS AND THIAZIDES › Beta blocking agents, non-selective, and thiazides
propranolol and thiazides
C07BA05
Forms & Strengths
- Fixed-dose combination tablets containing propranolol hydrochloride and a thiazide diuretic (e.g., hydrochlorothiazide)
- Available in various fixed ratios depending on regional and manufacturer specifications (e.g., 40 mg/25 mg, 80 mg/25 mg)
Adult Dosing
- Hypertension: 1 tablet daily to twice daily, titrated based on individual blood pressure response and tolerability
- Maximum daily dose limited by the thiazide component to avoid hypokalemia and other electrolyte disturbances
Pediatric Dosing
- Safety and efficacy in pediatric patients have not been established; fixed-dose combinations are generally not recommended in children
Indications
- Management of essential hypertension where combination therapy with a beta-blocker and a thiazide diuretic is appropriate
Mechanism of Action
- Propranolol is a non-selective beta-adrenergic receptor blocker that decreases heart rate, myocardial contractility, and cardiac output, and reduces renin release
- Thiazide diuretics inhibit sodium and chloride reabsorption in the distal convoluted tubules, leading to initial diuresis and sustained reduction in peripheral vascular resistance
Contraindications
- Bronchospastic conditions, including bronchial asthma or severe chronic obstructive pulmonary disease
- Sinus bradycardia and greater than first-degree heart block
- Cardiogenic shock and overt cardiac failure
- Anuria or hypersensitivity to sulfonamide-derived drugs and propranolol
Adverse Reactions
- Bradycardia, hypotension, and cold extremities from the beta-blocker
- Fatigue, dizziness, sleep disturbances, and depression
- Hypokalemia, hyponatremia, hyperuricemia, and hyperglycemia from the thiazide component
- Increased lipid parameters and gastrointestinal disturbances
Drug Interactions
- Enhanced hypotensive effects with other antihypertensive agents, vasodilators, and alcohol
- Thiazides may induce hypokalemia, increasing the toxicity risk of digitalis glycosides
- NSAIDs may blunt the antihypertensive efficacy of both beta-blockers and thiazides
- Concomitant use with calcium channel blockers (e.g., verapamil, diltiazem) increases the risk of bradycardia and heart block
Curated Content: Needs Vetting Before Put to Clinical Use