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Alpha-blockerPrescription only · Schedule H

Tamsulosin

Uses, side effects, interactions and warnings

Reviewed by Dr. Vikram Sethi, DNB (Urology) · Updated
Generic nameTamsulosin
Drug classAlpha-blocker
FormModified-release capsule
PrescriptionRequired
Starts workingA few days to 2 weeks
Lasts up to24 hours
Quick answer

Tamsulosin is a prescription medicine for urinary symptoms caused by an enlarged prostate (BPH), such as a weak stream or getting up at night. It relaxes muscles in the prostate and bladder neck. It can cause dizziness and reduce the amount of semen during ejaculation.

What is tamsulosin used for?

  • Urinary symptoms of benign prostatic hyperplasia (enlarged prostate)
  • Helping kidney stones pass (off-label)

How does tamsulosin work?

Tamsulosin blocks alpha-1 receptors in the smooth muscle of the prostate and bladder neck. This relaxes the muscle so urine flows more easily. It does not shrink the prostate.

How is tamsulosin taken?

It is usually taken as one 0.4 mg capsule a day, about 30 minutes after the same meal each day. Swallow the capsule whole. Your doctor will decide if it is right for you and review your symptoms after a few weeks.

What are the side effects of tamsulosin?

Common
  • Dizziness, especially on standing
  • Less or no semen during ejaculation
  • Runny or blocked nose
  • Headache
  • Tiredness
Get medical help right away
  • Fainting
  • Erection lasting more than 4 hours
  • Severe allergic reaction
  • Skin rash with blisters

Which medicines interact with tamsulosin?

Other alpha-blockers (doxazosin, prazosin)AvoidToo much blood pressure lowering.
PDE5 inhibitors (tadalafil, sildenafil)CautionIncrease the risk of dizziness and low blood pressure.
Ketoconazole, ritonavirCautionRaise tamsulosin levels.

Who should be careful with tamsulosin?

Tell your eye surgeon you take tamsulosin before cataract surgery, as it can affect the iris during the operation. Get up slowly from sitting or lying, especially when starting treatment. Tell your doctor about low blood pressure or severe liver or kidney disease.

Frequently asked questions

Why is there less semen when I take tamsulosin?

Tamsulosin can reduce or stop semen coming out during ejaculation. It is harmless and goes away if you stop the medicine.

Can tamsulosin be taken with tadalafil?

Sometimes, under medical supervision. Both lower blood pressure, so your doctor may start low and adjust.

Does tamsulosin shrink the prostate?

No. It relaxes the muscle to ease urine flow. Other medicines such as finasteride can shrink the prostate over months.

This information does not replace advice from your doctor or pharmacist. SexologistIndia.com does not sell medicines.