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## Tamsulosin
### Overview
Tamsulosin is an alpha-1 adrenergic receptor antagonist.
### Primary Indications
* Symptomatic benign prostatic hyperplasia (BPH).
* Facilitation of passage of kidney stones.
### Adult Dosing
* **BPH:** 0.4 mg orally once daily. May increase to 0.8 mg orally once daily after 2-4 weeks if insufficient response.
* **Kidney Stones:** 0.4 mg orally once daily. Duration of treatment varies and is typically guided by stone size and location, often for up to 4 weeks.
### Pediatric Dosing
There is no established safe and effective use of tamsulosin in pediatric patients.
### Dose Adjustments
* **Renal Impairment:** No dose adjustment is generally required for mild to moderate renal impairment. Caution is advised in severe renal impairment, though no specific dose reduction is recommended.
* **Hepatic Impairment:** No dose adjustment is recommended for mild to moderate hepatic impairment. Use with caution in severe hepatic impairment as tamsulosin is metabolized by CYP3A4 and CYP2D6.
### Contraindications
* Known hypersensitivity to tamsulosin or any component of the formulation.
* History of angioedema related to tamsulosin.
* Concomitant use with strong CYP3A4 inhibitors (e.g., ketoconazole, ritonavir, nelfinavir) is generally not recommended, especially for patients who do not tolerate the drug at lower doses.
### Adverse Effects
Common adverse effects include dizziness, headache, abnormal ejaculation (including retrograde ejaculation and ejaculatory dysfunction), rhinitis, and fatigue. Hypotension (including orthostatic hypotension) can occur. Intraoperative Floppy Iris Syndrome (IFIS) is a risk during cataract surgery.
### Key Drug Interactions
* **CYP3A4 Inhibitors (e.g., ketoconazole, ritonavir):** Increased tamsulosin exposure. Use with caution, particularly strong inhibitors, and consider a lower starting dose or avoiding concomitant use if possible.
* **CYP2D6 Inhibitors (e.g., fluoxetine, paroxetine):** May increase tamsulosin exposure.
* **Other Antihypertensives:** Additive hypotensive effects. Monitor blood pressure closely.
* **Erectile Dysfunction Agents (PDE5 inhibitors):** Use with caution due to potential for additive hypotensive effects.
### Monitoring
* Blood pressure, especially upon initiation or dose titration, and in patients taking concomitant antihypertensives.
* Symptoms of BPH.
* Efficacy in kidney stone passage.
* Ophthalmologists should be aware of tamsulosin use prior to cataract surgery.
### Clinical Pearls
* Tamsulosin is generally taken 30 minutes after the same meal each day to help minimize dizziness and orthostatic hypotension.
* Unlike some other alpha-blockers, tamsulosin has a higher selectivity for alpha-1A receptors, which are predominant in the prostate, potentially leading to fewer cardiovascular side effects.
* Tamsulosin can cause retrograde ejaculation, which is usually harmless but may affect fertility.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional protocols for definitive guidance.*
