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# Tamsulosin
## Overview
Tamsulosin is an alpha-1 selective adrenergic antagonist used to treat the symptoms of benign prostatic hyperplasia (BPH). It relaxes the smooth muscle in the prostate and bladder neck, improving urine flow.
## Primary Indications
* Symptoms of benign prostatic hyperplasia (BPH).
## Adult Dosing
* **BPH:** The typical dose is 0.4 mg orally once daily.
* If symptoms are not adequately controlled after 2-4 weeks, the dose may be increased to 0.8 mg orally once daily.
* **Note:** The 0.4 mg dose should be taken approximately 30 minutes after the same meal each day. The 0.8 mg dose is typically in a modified-release formulation and can be taken as prescribed without regard to meals.
## Pediatric Dosing
Tamsulosin is **not** indicated for use in the pediatric population.
## Dose Adjustments
* **Renal Impairment:** No dose adjustment is generally needed for mild to moderate renal impairment. Use with caution in severe renal impairment (CrCl < 10 mL/min), although specific dose reductions are not established.
* **Hepatic Impairment:** Use with caution in patients with moderate hepatic impairment. Tamsulosin is contraindicated in severe hepatic impairment.
## Contraindications
* Hypersensitivity to tamsulosin or any component of the formulation.
* History of orthostatic hypotension.
* Concurrent use with other alpha-1 adrenergic antagonists.
* Severe hepatic impairment.
## Adverse Effects
Common side effects include dizziness, headache, abnormal ejaculation (including retrograde ejaculation and ejaculatory failure), orthostatic hypotension, rhinitis, and somnolence. Less common but serious effects include priapism and intraoperative floppy iris syndrome (IFIS) during cataract surgery.
## Key Drug Interactions
* **Other Alpha-1 Blockers (e.g., doxazosin, terazosin):** Increased risk of hypotension.
* **Phosphodiesterase-5 (PDE5) Inhibitors (e.g., sildenafil, tadalafil):** Increased risk of symptomatic hypotension. Use with caution, monitor blood pressure.
* **Strong CYP3A4 Inhibitors (e.g., ketoconazole, ritonavir):** May increase tamsulosin exposure. Use with caution.
* **Beta-Blockers:** Increased risk of orthostatic hypotension.
## Monitoring
* Monitor for symptoms of BPH improvement.
* Monitor for adverse effects, particularly dizziness and orthostatic hypotension.
* Inform patients of the risk of IFIS during cataract surgery and advise them to inform their ophthalmologist prior to surgery.
## Clinical Pearls
* Onset of action for symptom relief is typically within 1-2 weeks.
* Dizziness and orthostatic hypotension are more likely when initiating therapy or increasing the dose. Advise patients to sit or lie down if they experience dizziness.
* DO NOT crush or chew extended-release capsules.
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**Disclaimer:** This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and relevant clinical guidelines for complete details before making any treatment decisions.
