Skip to main content

Tamsulosin (By mouth)

Tamsulosin Hydrochloride (tam-SOO-loe-sin hye-droe-KLOR-ide)

Treats problems with urination caused by an enlarged prostate (benign prostatic hyperplasia or BPH). This medicine is an alpha-blocker.

Brand Name(s):

Flomax

There may be other brand names for this medicine.

When This Medicine Should Not Be Used:

You should not use this medicine if you have had an allergic reaction to tamsulosin.

How to Use This Medicine:

Capsule

  • Take your medicine as directed. Your dose may need to be changed several times to find what works best for you.
  • Take this medicine 30 minutes after the same meal each day. Swallow the capsule whole. Do not crush, chew, or open it.
  • Read and follow the patient instructions that come with this medicine. Talk to your doctor or pharmacist if you have any questions.

If a dose is missed:

  • Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.

How to Store and Dispose of This Medicine:

  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.
  • Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.
  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

Drugs and Foods to Avoid:

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

  • Make sure your doctor knows if you are also using other alpha-blocker medicines such as doxazosin (Cardura®), prazosin (Minipress®, Minizide®), or terazosin (Hytrin®).
  • Tell your doctor if you are also using cimetidine (Tagamet®), erythromycin (Ery-Tab®), fluoxetine (Prozac®), ketoconazole (Nizoral®), paroxetine (Paxil®), terbinafine (Lamisil®), medicine for erectile dysfunction (such as sildenafil, tadalafil, vardenafil, Cialis®, Levitra®, or Viagra®), or a blood thinner (such as warfarin, Coumadin®).

Warnings While Using This Medicine:

  • Make sure your doctor knows if you have kidney disease, liver disease, low blood pressure, prostate cancer, or an allergy to sulfa drugs such as sulfamethoxazole, sulfasalazine, sulfasoxazole, Azulfidine®, Bactrim®, or Septra®.
  • This medicine may make you dizzy or drowsy. Avoid driving, using machines, or doing anything else that could be dangerous if you are not alert.
  • Dizziness, lightheadedness, or fainting may occur after you take this medicine, especially when you get up suddenly from a lying or sitting position. Getting up slowly may help. If you feel dizzy, lie down so you do not faint. Then sit for a few moments before standing to keep the dizziness from returning.
  • If you plan to have cataract surgery, tell your eye doctor (ophthalmologist) if you have used this medicine in the past 9 months. A serious eye problem called intraoperative floppy iris syndrome (IFIS) has occurred in some patients who were taking this medicine or who had recently taken this medicine when they had cataract surgery.
  • Seek medical attention right away if you experience a prolonged erection while using this medicine. This is an extremely rare unwanted effect that must be treated right away to prevent permanent erectile damage (impotence).
  • Your doctor will check your progress and the effects of this medicine at regular visits. Keep all appointments.

Possible Side Effects While Using This Medicine:

Call your doctor right away if you notice any of these side effects:

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
  • Blistering, peeling, red skin rash
  • Lightheadedness, dizziness, fainting
  • Painful, prolonged erection of the penis not caused by sexual arousal

If you notice these less serious side effects, talk with your doctor:

  • Decrease or change in your sexual desire
  • Problems with ejaculation
  • Runny or stuffy nose

If you notice other side effects that you think are caused by this medicine, tell your doctor

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088


Last Updated: 4/4/2014

Copyright © 1984- Thomson Micromedex. All rights reserved.

Thomson & A.D.A.M