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# Tamsulosin
## Overview
Tamsulosin is an alpha-1 adrenergic receptor antagonist.
## Primary Indications
* Benign prostatic hyperplasia (BPH): To improve the signs and symptoms of BPH.
* Ureteral stones: To facilitate the passage of kidney stones.
## Adult Dosing
* **BPH:** 0.4 mg orally once daily. May increase to 0.8 mg orally once daily after 2 to 4 weeks if needed.
* **Ureteral stones:** 0.4 mg orally once daily. Duration of treatment is typically up to 4 weeks.
## Pediatric Dosing
Tamsulosin is not indicated for use in the pediatric population.
## Dose Adjustments
* **Renal impairment:** No dose adjustment is generally required for mild to moderate renal impairment. Use with caution in severe renal impairment.
* **Hepatic impairment:** Use with caution in patients with moderate hepatic impairment, as tamsulosin is extensively metabolized by the liver. Avoid in severe hepatic impairment.
## Contraindications
* Known hypersensitivity to tamsulosin or its components.
## Adverse Effects
Common adverse effects include dizziness, abnormal ejaculation (e.g., retrograde ejaculation, ejaculation failure), orthostatic hypotension, headache, and nasopharyngitis.
## Key Drug Interactions
* **CYP3A4 inhibitors (e.g., ketoconazole, ritonavir):** May increase tamsulosin exposure and the risk of adverse effects. Consider a lower dose of tamsulosin or alternative agent.
* **CYP2D6 inhibitors (e.g., paroxetine):** May increase tamsulosin exposure.
* **Other alpha-blockers (e.g., terazosin, doxazosin):** Additive hypotensive effects may occur. Concurrent use is generally not recommended.
* **Erectile dysfunction agents (e.g., sildenafil):** Potential for additive hypotensive effects. Monitor blood pressure.
## Monitoring
* Blood pressure, especially with initiation of therapy or dose changes, and in patients taking antihypertensive medications.
* Signs and symptoms of BPH or ureteral stone passage.
* For intraoperative floppy iris syndrome (IFIS) awareness in patients undergoing cataract surgery.
## Clinical Pearls
* Tamsulosin is generally taken at the same time each day, 30 minutes after a meal.
* The 0.4 mg capsules are designed to provide modified release. Do not chew, crush, or open the capsules.
* Dizziness and syncope can occur, particularly with the first dose. Advise patients to rise slowly from a sitting or lying position.
* Inform patients undergoing cataract surgery about the risk of IFIS and to inform their ophthalmologist that they are taking tamsulosin.
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*Please verify current prescribing information for the most up-to-date recommendations.*
