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# Urimax (Tamsulosin)
## Overview
Tamsulosin is a selective α1-adrenoceptor antagonist that acts predominantly on α1A receptors in the prostate and bladder neck, causing smooth muscle relaxation and increasing urine flow.
## Primary Indications
* Treatment of signs and symptoms of benign prostatic hyperplasia (BPH).
* Off-label: Medical expulsive therapy (MET) for ureteral calculi.
## Adult Dosing
* **BPH:** 0.4 mg orally once daily.
* **Maximum Dose:** 0.8 mg daily. If no response at 0.4 mg after 2–4 weeks, the dose may be increased to 0.8 mg once daily.
* **Administration:** Take 30 minutes after the same meal each day. Swallow whole; do not crush or chew.
## Pediatric Dosing
* Not indicated for pediatric use. Safety and efficacy are not established.
## Dose Adjustments
* **Renal Impairment:** No dosage adjustment indicated for mild to moderate impairment. Use caution in severe impairment (CrCl < 10 mL/min); data are limited.
* **Hepatic Impairment:** No dosage adjustment indicated for mild to moderate impairment. Use is not recommended in severe impairment (Child-Pugh Class C).
## Contraindications
* Hypersensitivity to tamsulosin or any component of the formulation.
* History of angioedema with tamsulosin.
## Adverse Effects
* **Common:** Dizziness, headache, abnormal ejaculation (ejaculatory dysfunction).
* **Serious:** Orthostatic hypotension (rarely syncope), intraoperative floppy iris syndrome (IFIS) during cataract surgery, priapism (rare).
## Key Drug Interactions
* **Strong CYP3A4 inhibitors (e.g., ketoconazole, clarithromycin):** May significantly increase tamsulosin exposure. Avoid or use with caution.
* **Other α-blockers:** Concomitant use increases risk of hypotension.
* **PDE5 inhibitors (e.g., sildenafil, tadalafil):** Potential for additive blood pressure lowering; initiate with lowest doses.
## Monitoring
* Monitor blood pressure periodically, especially upon initiation or dose escalation.
* Assess for relief of BPH symptoms (e.g., I-PSS score).
* Evaluate for potential prostate malignancy prior to initiation.
## Clinical Pearls
* **Cataract Surgery:** Advise patients to inform their ophthalmologist of current or past tamsulosin use, as it increases the risk of IFIS.
* **Orthostasis:** Risk is highest shortly after the first dose or after increasing the dosage. Advise patients to rise slowly from a sitting or lying position.
* **Ejaculatory Dysfunction:** Counsel patients that this is a recognized side effect, which may improve if the medication is discontinued.
* **Ureteral Calculi (Off-label):** Common off-label dosing for stone expulsion is 0.4 mg daily for up to 4 weeks.
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*Disclaimer: This information is for educational purposes only. Clinical practice protocols vary. Always verify current prescribing information, dosage, and safety guidelines with institutional resources or the most recent package insert before prescribing or administering medication.*
