Medication Guide App

Tamsulosin Dosage

The information at is not a substitute for medical advice. ALWAYS consult your doctor or pharmacist.

Usual Adult Dose for:

Additional dosage information:

Usual Adult Dose for Benign Prostatic Hyperplasia

0.4 mg orally once daily one-half hour following the same meal each day

Renal Dose Adjustments

Patients with CrCl greater than 10 mL/min do not need dosage adjustment.

Patients with CrCl less than 10 ml/min have not been studied.

Liver Dose Adjustments

No dosage adjustment necessary in patients with moderate hepatic dysfunction.

Patients with severe hepatic impairment have not been studied.

Dose Adjustments

For patients who fail to respond to the 0.4 mg dose after 2 to 4 weeks of dosing, the dose may be increased to 0.8 mg orally once daily one-half hour following the same meal each day.


If tamsulosin administration is discontinued or interrupted for several days at either the 0.4 mg or 0.8 mg dose, therapy should be started again with the 0.4 mg once-daily dose.

Safety and effectiveness have not been established in pediatric patients (less than 18 years old).


Tamsulosin is 94% to 99% protein bound and unlikely to be dialyzed.

Other Comments

Capsules should be swallowed whole, not chewed, crushed, or opened.

Patients should be cautioned about orthostatic hypotension and syncope, especially when driving, operating machinery, or performing hazardous tasks.

Patients should seek immediate medical attention if priapism occurs.