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# Urimax (tamsulosin)
## Overview
Tamsulosin is a selective alpha-1 adrenergic receptor antagonist that preferentially binds to alpha-1A receptors in the prostate, bladder neck, and urethra, promoting smooth muscle relaxation and improving urinary flow.
## Primary Indications
* Treatment of signs and symptoms of benign prostatic hyperplasia (BPH).
* Off-label: Medical expulsive therapy for ureteral calculi.
## Adult Dosing
* **BPH:** 0.4 mg orally once daily.
* If no response after 2–4 weeks at 0.4 mg, the dose may be increased to 0.8 mg orally once daily.
* **Maximum Dose:** 0.8 mg daily.
## Pediatric Dosing
* **Not established:** Tamsulosin is generally not indicated for pediatric use.
## Dose Adjustments
* **Renal Impairment:** No dosage adjustment needed for mild to moderate impairment. Use caution in severe impairment.
* **Hepatic Impairment:** Not recommended in severe hepatic impairment.
* **CYP3A4/2D6 Inhibitors:** Avoid or exercise caution with potent inhibitors (e.g., ketoconazole, paroxetine) due to increased exposure.
## Contraindications
* Hypersensitivity to tamsulosin.
## Adverse Effects
* **Common:** Orthostatic hypotension, dizziness, headache, abnormal ejaculation (retrograde ejaculation), rhinitis.
* **Serious:** Intraoperative Floppy Iris Syndrome (IFIS) during cataract surgery, priapism, syncope, severe allergic reactions (angioedema, Stevens-Johnson syndrome).
## Key Drug Interactions
* **PDE-5 Inhibitors (e.g., sildenafil, tadalafil):** Increases risk of symptomatic hypotension; initiate at lowest dose of PDE-5 inhibitor if co-administered.
* **Strong CYP3A4 inhibitors (e.g., clarithromycin, ritonavir):** Significantly increase tamsulosin plasma concentrations.
* **Antihypertensives:** Potential for additive hypotensive effects.
## Monitoring
* Monitor blood pressure periodically, especially upon initiation or during dose titration.
* Assess symptom improvement (e.g., AUA Symptom Score).
* Screen for cataract surgery; advise ophthalmologist of current or past tamsulosin use.
## Clinical Pearls
* **Administration:** Should be administered 30 minutes after the same meal each day to ensure consistent bioavailability. Swallow capsule whole; do not crush, chew, or open.
* **First-dose effect:** Patients may experience orthostatic hypotension, particularly after the first dose or a dose increase. Advise patients to rise slowly from a sitting or lying position.
* **IFIS:** The risk of Intraoperative Floppy Iris Syndrome persists even if tamsulosin is discontinued prior to surgery.
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**Educational Disclaimer:** This information is for educational purposes only and does not constitute medical advice. Always verify current prescribing information, local clinical guidelines, and patient-specific factors with a qualified healthcare professional before prescribing or administering medication.
