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# Tamsulosin (Urimax)
## Overview
Tamsulosin is an alpha-1 adrenergic receptor antagonist.
## Primary Indications
* Benign Prostatic Hyperplasia (BPH)
## Adult Dosing
* For BPH: 0.4 mg orally once daily.
* If insufficient response after 2-4 weeks, may increase to 0.8 mg orally once daily.
* Consider dose reduction in patients with hepatic impairment.
## Pediatric Dosing
* Tamsulosin is not indicated for use in pediatric patients.
## Dose Adjustments
* **Renal impairment:** No dose adjustment is generally required for mild to moderate renal impairment. Extreme caution and potential dose reduction are advised in severe renal impairment.
* **Hepatic impairment:** No dose adjustment is generally required for mild to moderate hepatic impairment, but caution is advised. Dose reduction should be considered.
## Contraindications
* Hypersensitivity to tamsulosin or any component of the formulation.
* History of angioedema with tamsulosin.
* Concomitant use with other alpha-1 adrenergic receptor antagonists.
## Adverse Effects
Common adverse effects include:
* Dizziness
* Headache
* Abnormal ejaculation (e.g., retrograde ejaculation, ejaculatory failure)
* Nasal congestion
* Rhinorrhea
* Gastrointestinal upset
Serious adverse effects include:
* Orthostatic hypotension
* Syncope
* Intraoperative Floppy Iris Syndrome (IFIS) during cataract surgery – patients should inform their ophthalmologist they are taking tamsulosin.
* Angioedema
## Key Drug Interactions
* **Other antihypertensives and alcohol:** Increased risk of dizziness and orthostatic hypotension.
* **CYP3A4 inhibitors (e.g., ketoconazole, ritonavir):** May increase tamsulosin exposure. Dose reduction may be considered.
* **CYP2D6 inhibitors (e.g., paroxetine):** May increase tamsulosin exposure. Dose reduction may be considered.
## Monitoring
* Blood pressure, particularly upon initiation or dose increase, to assess for orthostatic hypotension.
* Signs and symptoms of BPH.
* Patients undergoing cataract surgery should inform their ophthalmologist if taking tamsulosin.
## Clinical Pearls
* Tamsulosin should be taken at the same time every day, preferably in the morning.
* It may be taken with or without food.
* Instruct patients to rise slowly from a seated or lying position to minimize the risk of dizziness and orthostatic hypotension.
* The risk of IFIS is increased in patients taking tamsulosin.
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*It is essential to verify the most current prescribing information and local protocols for definitive guidance.*
