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# Tamsulosin ## Overview Tamsulosin is a selective alpha-1A adrenergic receptor antagonist. ## Primary Indications * Benign Prostatic Hyperplasia (BPH): To improve the signs and symptoms of BPH. * Nephrolithiasis: To facilitate ureteral stone passage. ## Adult Dosing * **BPH:** 0.4 mg once daily. May increase to 0.8 mg once daily after 2-4 weeks if not adequately responsive. * **Nephrolithiasis:** 0.4 mg once daily. Dosing duration is variable and depends on stone size and location. ## Pediatric Dosing There is no established use of tamsulosin in pediatric patients. ## Dose Adjustments No specific dose adjustments are recommended for renal or hepatic impairment, though caution may be advised in severe impairment. ## Contraindications * Hypersensitivity to tamsulosin or any component of the formulation. * Concomitant use with other alpha-blockers. * History of severe allergic reactions to sulfonamides is sometimes cited as a relative contraindication, although evidence is limited and this is debated. ## Adverse Effects Common adverse effects include dizziness, headache, abnormal ejaculation (including retrograde ejaculation and ejaculatory failure), rhinitis, blurred vision, and postural hypotension. ## Key Drug Interactions * **CYP3A4 Inhibitors (e.g., ketoconazole, ritonavir):** May increase tamsulosin concentrations, potentially increasing the risk of adverse effects. Use with caution. * **CYP2D6 Inhibitors (e.g., fluoxetine, paroxetine):** May increase tamsulosin concentrations. Use with caution. *