Consumer Information Side Effects: Tamsulosin


Tamsulosin is used for:

Treating enlarged prostate (benign prostatic hyperplasia [BPH]). It may also be used for other conditions as determined by your doctor.

Tamsulosin is an alpha-blocker. It works by relaxing muscles in the prostate and bladder, which helps to improve urine flow and reduce symptoms of BPH.

Do NOT use Tamsulosin if:

  • you are allergic to any ingredient in Tamsulosin
  • you are taking another alpha-blocker (eg, prazosin), certain azole antifungals (eg, itraconazole, ketoconazole, posaconazole), certain macrolide antibiotics (eg, clarithromycin), HIV protease inhibitors (eg, ritonavir), nefazodone, or telithromycin

Contact your doctor or health care provider right away if any of these apply to you.

Before using Tamsulosin:

Some medical conditions may interact with Tamsulosin. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

  • if you are pregnant, planning to become pregnant, or are breast-feeding
  • if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
  • if you have allergies to medicines or other substances
  • if you have had a severe allergic reaction (eg, severe rash, hives, difficulty breathing, dizziness) to any sulfonamide (sulfa) medicine, such as acetazolamide, celecoxib, certain diuretics (eg, hydrochlorothiazide), sulfonylureas (eg, glyburide), probenecid, sulfamethoxazole, valdecoxib, or zonisamide
  • if you have a history of liver or kidney problems, high or low blood pressure, or prostate cancer
  • if you will be having a certain type of eye surgery (cataract surgery)

Some MEDICINES MAY INTERACT with Tamsulosin. Tell your health care provider if you are taking any other medicines, especially any of the following:

  • Alpha-blockers (eg, prazosin) or phosphodiesterase type 5 (PDE5) inhibitors (eg, sildenafil) because symptoms of low blood pressure (eg, severe dizziness, lightheadedness, fainting) may occur
  • Azole antifungals (eg, fluconazole, itraconazole, ketoconazole, posaconazole), cimetidine, HIV protease inhibitors (eg, ritonavir), macrolide antibiotics (eg, clarithromycin, erythromycin), nefazodone, serotonin specific reuptake inhibitors (eg, fluoxetine, paroxetine), telithromycin, or terbinafine because they may increase the risk of Tamsulosin’s side effects
  • Warfarin because the risk of side effects may be increased

This may not be a complete list of all interactions that may occur. Ask your health care provider if Tamsulosin may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.


Shares