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# Tamsulosin
## Overview
Tamsulosin is an alpha-1 adrenergic receptor antagonist.
## Primary Indications
* Treatment of signs and symptoms of benign prostatic hyperplasia (BPH).
## Adult Dosing
* **BPH:** 0.4 mg orally once daily. Some patients may benefit from an increase to 0.8 mg orally once daily.
* Take the dose at the same time each day.
* Do not crush, chew, or open the capsules.
## Pediatric Dosing
Tamsulosin is not indicated for use in the pediatric population.
## Dose Adjustments
* **Hepatic Impairment:** Mild to moderate hepatic impairment generally does not require dose adjustment. Use with caution in severe hepatic impairment, as data is limited.
* **Renal Impairment:** Mild to moderate renal impairment generally does not require dose adjustment. Dose adjustment is not recommended in severe renal impairment, though caution is advised.
## Contraindications
* Hypersensitivity to tamsulosin or any component of the formulation.
## Adverse Effects
* **Common:** Dizziness, abnormal ejaculation (e.g., retrograde ejaculation, ejaculation failure), somnolence, rhinitis, headache.
* **Serious:** Intraoperative Floppy Iris Syndrome (IFIS) during cataract surgery, potential for syncope.
## Key Drug Interactions
* **CYP3A4 Inhibitors:** Strong CYP3A4 inhibitors (e.g., ketoconazole, ritonavir) can increase tamsulosin exposure, potentially increasing the risk of adverse effects. Use with caution; dose reduction may be considered if necessary, though specific recommendations vary.
* **Alpha-blockers (other):** Concomitant use with other alpha-blockers may lead to additive pharmacodynamic effects and an increased risk of hypotension and dizziness. This combination is generally not recommended.
* **Antihypertensives:** Additive hypotensive effects may occur. Monitor blood pressure.
* **PDE5 Inhibitors:** Use with caution due to potential additive hypotensive effects.
## Monitoring
* Monitor for signs and symptoms of orthostatic hypotension (e.g., dizziness, lightheadedness), especially upon initiation or dose increase.
* Assess for improvement in BPH symptoms.
* Patients undergoing cataract surgery should inform their ophthalmologist they are taking tamsulosin.
## Clinical Pearls
* Tamsulosin has a higher selectivity for alpha-1A and alpha-1D receptors, which are predominant in the prostate, compared to other alpha-blockers.
* The extended-release capsules are designed to release the drug slowly over time. Do not crush, chew, or open them to avoid rapid release of the drug, which can lead to increased side effects.
* Dizziness and syncope are significant risks, especially in the elderly or when combined with other blood pressure-lowering medications or alcohol.
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*This information is intended for clinical use and does not substitute for professional medical advice. Always consult the most current prescribing information for complete details and to ensure adherence to local protocols.*
