Flomax

DRUG DESCRIPTION

Tamsulosin hydrochloride is an antagonist of alpha1A adrenoceptors in the prostate.

Tamsulosin hydrochloride is (-)-(R)-5-[2-[[2-(o-Ethoxyphenoxy) ethyl]amino]propyl]-2-methoxybenzenesulfonamide, monohydrochloride. Tamsulosin hydrochloride is a white crystalline powder that melts with decomposition at approximately 230°C. It is sparingly soluble in water and methanol, slightly soluble in glacial acetic acid and ethanol, and practically insoluble in ether.

The empirical formula of tamsulosin hydrochloride is C20H28N2O5S• HCl. The molecular weight of tamsulosin hydrochloride is 444.98. Its structural formula is:

Flomax® (tamsulosin hydrochloride) Structural Formula Illustration

Each FLOMAX capsule for oral administration contains tamsulosin hydrochloride 0.4 mg, and the following inactive ingredients: methacrylic acid copolymer dispersion, NF; microcrystalline cellulose, NF; triacetin, USP; calcium stearate, NF; talc, USP; FD&C blue No. 2; titanium dioxide; ferric oxide; gelatin, and trace amounts of black edible ink.

What are the possible side effects of tamsulosin (Flomax)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using tamsulosin and call your doctor at once if you have any of these serious side effects:

  • penis erection that is painful or lasts 4 hours or longer;
  • severe dizziness; or
  • fainting.

Less serious side effects may include:

  • mild dizziness or drowsiness;
  • sleep problems (insomnia);
  • abnormal...

Read All Potential Side Effects and See Pictures of Flomax »

What are the precautions when taking tamsulosin hydrochloride (Flomax)?

Before taking tamsulosin, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history.

This drug may make you dizzy or drowsy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.

To reduce the risk of dizziness, lightheadedness, or fainting, get up slowly when rising from a sitting or lying position, especially when you first start taking this drug or if your doctor changes your dose. If dizziness occurs,...

Read All Potential Precautions of Flomax »


Flomax Consumer (continued)

SIDE EFFECTS: Dizziness, lightheadedness, drowsiness, runny/stuffy nose, or ejaculation problems may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if this rare but serious side effect occurs: fainting.

Rarely, males may have a painful or prolonged erection lasting 4 or more hours. If this occurs, stop using this drug and get medical help right away, or permanent problems could occur.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

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

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

PRECAUTIONS: Before taking tamsulosin, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history.

This drug may make you dizzy or drowsy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.

To reduce the risk of dizziness, lightheadedness, or fainting, get up slowly when rising from a sitting or lying position, especially when you first start taking this drug or if your doctor changes your dose. If dizziness occurs, sit or lie down until you feel better. Also, when you first start taking this drug, avoid situations where you may be injured if you faint.

Before having surgery (including cataract eye surgery), tell your doctor or dentist that you are taking this medication and about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

This medication is not usually used in women. Therefore, it is unlikely to be used during pregnancy or breast-feeding. Consult your doctor if you have any questions about this medication.


Flomax Patient Information Including Side Effects

Brand Names: Flomax

Generic Name: tamsulosin (oral) (Pronunciation: tam soo LO sin)

  • What is tamsulosin (Flomax)?
  • What are the possible side effects of tamsulosin (Flomax)?
  • What is the most important information I should know about tamsulosin (Flomax)?
  • What should I discuss with my healthcare provider before taking tamsulosin (Flomax)?
  • How should I take tamsulosin (Flomax)?
  • What happens if I miss a dose (Flomax)?
  • What happens if I overdose (Flomax)?
  • What should I avoid while taking tamsulosin (Flomax)?
  • What other drugs will affect tamsulosin (Flomax)?
  • Where can I get more information?

What is tamsulosin (Flomax)?

Tamsulosin is in a group of drugs called alpha-adrenergic (AL-fa ad-ren-ER-jik) blockers. Tamsulosin relaxes your veins and arteries so that blood can more easily pass through them. It also relaxes the muscles in the prostate and bladder neck, making it easier to urinate.

Tamsulosin is used to improve urination in men with benign prostatic hyperplasia (enlarged prostate).

Tamsulosin may also be used for other purposes not listed in this medication guide.

What are the possible side effects of tamsulosin (Flomax)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using tamsulosin and call your doctor at once if you have any of these serious side effects:

  • penis erection that is painful or lasts 4 hours or longer;
  • severe dizziness; or
  • fainting.

Less serious side effects may include:

  • mild dizziness or drowsiness;
  • sleep problems (insomnia);
  • abnormal ejaculation, decreased sex drive; or
  • runny or stuffy nose, sore throat.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about tamsulosin (Flomax)?

Tamsulosin can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert. You may feel dizzy when getting up from a sitting or lying position. Avoid standing up too quickly to keep from falling.

Avoid drinking alcohol. It may increase dizziness caused by tamsulosin.

Before taking tamsulosin, tell your doctor if you are allergic to sulfa drugs. You may also be allergic to tamsulosin.

Tamsulosin can affect the pupils of your eyes during cataract surgery. If you have cataract surgery during your treatment with tamsulosin, tell the surgeon ahead of time that you are using this medication. Do not stop using tamsulosin before surgery unless your surgeon tells you to.

Stop using tamsulosin and call your doctor at once if you feel like you might pass out, or if you have an erection of your penis that is painful or lasts longer than 4 hours.

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