Skip to Content

Flomax

Generic Name: Tamsulosin (tam SOO loe sin)
Brand Name: Flomax

Medically reviewed on September 5, 2018

Uses of Flomax:

  • In men, it is used to treat the signs of an enlarged prostate.
  • It may be given to you for other reasons. Talk with the doctor.

What do I need to tell my doctor BEFORE I take Flomax?

  • If you have an allergy to tamsulosin or any other part of Flomax (tamsulosin).
  • If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Tell your doctor about the allergy and what signs you had, like rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
  • If you take any drugs (prescription or OTC, natural products, vitamins) that must not be taken with Flomax (tamsulosin), like certain drugs that are used for HIV, infections, or depression. There are many drugs that must not be taken with Flomax (tamsulosin). Your doctor or pharmacist can tell you if you are taking a drug that must not be taken with Flomax (tamsulosin).
  • If you are taking or will be taking another drug like this one.

This is not a list of all drugs or health problems that interact with Flomax (tamsulosin).

Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take Flomax (tamsulosin) with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

What are some things I need to know or do while I take Flomax?

  • Tell all of your health care providers that you take Flomax (tamsulosin). This includes your doctors, nurses, pharmacists, and dentists.
  • Avoid driving and doing other tasks or actions that call for you to be alert until you see how Flomax (tamsulosin) affects you.
  • To lower the chance of feeling dizzy or passing out, rise slowly if you have been sitting or lying down. Be careful going up and down stairs.
  • If you are having cataract surgery or other eye procedure, talk with your doctor.
  • Have your blood pressure checked often. Talk with your doctor.
  • If taking for an enlarged prostate, have a rectal exam (to check prostate gland) and blood work (PSA test) as you have been told by the doctor.
  • Talk with your doctor before you drink alcohol.
  • Be careful in hot weather or while being active. Drink lots of fluids to stop fluid loss.
  • This medicine is not approved for use in women. If you are a woman using Flomax (tamsulosin), talk with your doctor if you are pregnant, plan on getting pregnant, or are breast-feeding.

Children:

  • This medicine is not approved for use in children. However, the doctor may decide the benefits of taking Flomax (tamsulosin) outweigh the risks. If your child has been given Flomax (tamsulosin), ask the doctor for information about the benefits and risks. Talk with the doctor if you have questions about giving Flomax (tamsulosin) to your child.

How is this medicine (Flomax) best taken?

Use Flomax (tamsulosin) as ordered by your doctor. Read all information given to you. Follow all instructions closely.

  • Take 30 minutes after the same meal every day.
  • Swallow whole. Do not chew, break, or crush.
  • Do not open the capsules.
  • Drink lots of noncaffeine liquids unless told to drink less liquid by your doctor.

What do I do if I miss a dose?

  • Take a missed dose as soon as you think about it.
  • If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
  • Do not take 2 doses at the same time or extra doses.
  • If you miss taking Flomax (tamsulosin) for a few days in a row, call your doctor before you start taking it again.

See also: Dosage Information (in more detail)

What are some side effects that I need to call my doctor about right away?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

  • Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
  • Very bad dizziness or passing out.
  • Fever or chills.
  • Sore throat.
  • Call your doctor right away if you have a painful erection (hard penis) or an erection that lasts for longer than 4 hours. This may happen even when you are not having sex. If this is not treated right away, it may lead to lasting sex problems and you may not be able to have sex.

What are some other side effects of Flomax?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.

See also: Side effects (in more detail)

If OVERDOSE is suspected:

If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

How do I store and/or throw out Flomax?

  • Store at room temperature.
  • Store in a dry place. Do not store in a bathroom.
  • Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
  • Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.

Consumer information use

  • If your symptoms or health problems do not get better or if they become worse, call your doctor.
  • Do not share your drugs with others and do not take anyone else's drugs.
  • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
  • Talk with the doctor before starting any new drug, including prescription or OTC, natural products, or vitamins.
  • Some drugs may have another patient information leaflet. Check with your pharmacist. If you have any questions about Flomax (tamsulosin), please talk with your doctor, nurse, pharmacist, or other health care provider.
  • If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Hide