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CARDIOVASCULAR SYSTEM › BETA BLOCKING AGENTS › BETA BLOCKING AGENTS AND THIAZIDES › Beta blocking agents, non-selective, and thiazides
sotalol and thiazides
C07BA07
Forms & Strengths
- Fixed-dose combination products containing sotalol hydrochloride and a thiazide diuretic (e.g., hydrochlorothiazide) are not standard globally; sotalol is typically available as oral tablets (80 mg, 120 mg, 160 mg, 240 mg) and IV formulation, co-prescribed with thiazides.
- Thiazide diuretics are commonly available as oral tablets (e.g., hydrochlorothiazide 12.5 mg, 25 mg, 50 mg).
Adult Dosing
- Sotalol: Initial 80 mg orally twice daily, titrated up to 160 to 320 mg/twice daily in 2-3 divided doses based on QT interval and clinical response.
- Thiazide diuretic (e.g., hydrochlorothiazide): 12.5 mg to 50 mg orally once daily for hypertension or edema.
Pediatric Dosing
- Safety and efficacy in pediatric patients have not been established; use is generally not recommended.
- If used off-label for pediatric arrhythmias, sotalol dosing is weight-based (e.g., 30 to 210 mg/m²/day divided into 2-3 doses).
Indications
- Management of symptomatic ventricular arrhythmias (e.g., sustained ventricular tachycardia).
- Maintenance of normal sinus rhythm in patients with symptomatic atrial fibrillation/flutter.
Mechanism of Action
- Sotalol: Non-cardioselective beta-adrenergic receptor blocker (Class II) and potassium channel blocker (Class III antiarrhythmic), prolonging cardiac repolarization and action potential duration.
- Thiazide diuretics: Inhibit sodium and chloride reabsorption in the distal convoluted tubules, leading to increased excretion of sodium, water, potassium, and hydrogen ions.
Contraindications
- Hypersensitivity to sotalol, sulfonamides, or thiazides.
- Bronchial asthma or severe chronic obstructive pulmonary disease.
- Sinus bradycardia (<50 bpm), sick sinus syndrome, or second/third-degree AV block without a pacemaker.
- Congenital or acquired long QT syndromes.
- Cardiogenic shock and decompensated heart failure.
- Severe renal impairment (CrCl < 40 mL/min for sotalol; anuria for thiazides).
Adverse Reactions
- Torsades de pointes and excessive QT prolongation.
- Bradycardia, hypotension, and exacerbation of heart failure.
- Fatigue, dizziness, and dyspnea.
- Electrolyte disturbances including hypokalemia, hypomagnesemia, hyponatremia, and hyperuricemia (due to the thiazide component).
Drug Interactions
- Concomitant administration of thiazides causes hypokalemia and hypomagnesemia, significantly increasing the risk of sotalol-induced Torsades de pointes.
- Other QT-prolonging drugs (e.g., antipsychotics, macrolides, fluoroquinolones) amplify arrhythmia risk.
- Calcium channel blockers (verapamil, diltiazem) increase the risk of bradycardia and AV block.
- NSAIDs may decrease the antihypertensive efficacy of thiazides and increase nephrotoxicity.
Curated Content: Needs Vetting Before Put to Clinical Use