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# Tamsulosin
## Overview
Tamsulosin is an alpha-1 adrenergic receptor antagonist.
## Primary Indications
* Benign prostatic hyperplasia (BPH): To improve signs and symptoms of BPH.
* Nephrolithiasis: Facilitate passage of kidney stones.
## Adult Dosing
* **BPH:** 0.4 mg orally once daily. May be increased to 0.8 mg orally once daily after 2-4 weeks if symptoms do not adequately improve.
* **Nephrolithiasis:** 0.4 mg orally once daily. Typically prescribed for up to 4 weeks, or until stone passage is confirmed.
## Pediatric Dosing
There are no established pediatric indications or dosing for tamsulosin.
## Dose Adjustments
* **Renal Impairment:** No dose adjustment is typically required for mild to moderate renal impairment. Use with caution in severe renal impairment.
* **Hepatic Impairment:** Use with caution in patients with hepatic impairment; no specific dose adjustments are available.
## Contraindications
* Hypersensitivity to tamsulosin or any component of the formulation.
* Concomitant use with other alpha-1 adrenergic receptor antagonists.
## Adverse Effects
Common adverse effects include dizziness, headache, orthostatic hypotension, abnormal ejaculation (e.g., retrograde ejaculation, ejaculatory failure), nasal congestion, and fatigue.
## Key Drug Interactions
* **Other Alpha-1 Blockers:** Increased risk of hypotension.
* **CYP3A4 Inhibitors (e.g., ketoconazole, ritonavir):** May increase tamsulosin plasma concentrations, potentially increasing adverse effects.
* **CYP2D6 Inhibitors (e.g., paroxetine):** May increase tamsulosin plasma concentrations.
* **Erectile Dysfunction Agents (e.g., sildenafil, tadalafil):** Use with caution; potential for additive hypotensive effects.
## Monitoring
* Blood pressure, especially orthostatic changes, upon initiation and dosage adjustments.
* Symptoms of BPH.
* Potential for medication overuse headache if used for nephrolithiasis.
## Clinical Pearls
* Tamsulosin is formulated as a modified-release capsule and should not be crushed, chewed, or opened.
* Patients should be counselled regarding the risk of dizziness and orthostatic hypotension, especially when standing up. Advise to rise slowly.
* Intraoperative Floppy Iris Syndrome (IFIS) has been observed during cataract surgery in patients taking or previously taking tamsulosin. Inform ophthalmologists prior to surgery.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the current prescribing information and relevant institutional protocols for complete and up-to-date guidance.*
