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# Tamsulosin
## Overview
Tamsulosin is an alpha-1 adrenergic receptor antagonist.
## Primary Indications
* Benign prostatic hyperplasia (BPH) - to improve urine flow
* Nephrolithiasis (kidney stones) - facilitation of stone passage
## Adult Dosing
* **BPH:** 0.4 mg orally once daily. May increase to 0.8 mg orally once daily if response is inadequate.
* **Nephrolithiasis:** 0.4 mg orally once daily is commonly used off-label. Dosing may vary based on stone size and location, and local protocols.
## Pediatric Dosing
Tamsulosin is not indicated for use in pediatric patients.
## Dose Adjustments
* **Renal Impairment:** No dose adjustment is generally needed for mild to severe renal impairment, as tamsulosin is not significantly removed by dialysis.
* **Hepatic Impairment:** Use with caution in mild to moderate hepatic impairment. Avoid use in severe hepatic impairment.
## Contraindications
* Known 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, abnormal ejaculation (ejaculatory dysfunction), headache, rhinitis, and orthostatic hypotension.
## Key Drug Interactions
* **CYP3A4 Inhibitors (e.g., ketoconazole, ritonavir):** May increase tamsulosin exposure. Consider alternative agents or dose reduction if coadministration is necessary.
* **Other Alpha-1 Blockers:** Additive hypotensive effects.
## Monitoring
* Monitor for signs and symptoms of orthostatic hypotension (dizziness, lightheadedness).
* Assess symptom improvement for BPH.
* For nephrolithiasis, monitor for stone passage or signs of complication (e.g., infection, intractable pain).
## Clinical Pearls
* Tamsulosin has a higher selectivity for alpha-1A and alpha-1D receptors, which are predominantly found in the prostate, potentially leading to fewer cardiovascular side effects compared to non-selective alpha-1 blockers.
* May cause intraoperative floppy iris syndrome (IFIS) during cataract surgery. Inform ophthalmologists of tamsulosin use prior to surgery.
* Patients should be advised to stand or sit up slowly when starting therapy or changing doses to minimize dizziness.
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*Disclaimer: This information is intended for clinical use and does not replace comprehensive drug information resources. Always consult the current prescribing information and relevant clinical guidelines before making therapeutic decisions.*
