Medication Guide App

tamsulosin (Oral route)

Pronunciation

tam-SOO-loe-sin hye-droe-KLOR-ide

Commonly used brand name(s)

In the U.S.

  • Flomax

Available Dosage Forms:

  • Capsule

Therapeutic Class: Benign Prostatic Hypertrophy Agent

Pharmacologic Class: Tamsulosin

Uses For tamsulosin

Tamsulosin is used to treat men who have symptoms of an enlarged prostate gland, which is also known as benign enlargement of the prostate (benign prostatic hyperplasia or BPH). Benign enlargement of the prostate is a problem that can occur in men as they get older. The prostate gland is located below the bladder. As the prostate gland enlarges, certain muscles in the gland may become tight and get in the way of the tube that drains urine from the bladder. This can cause problems in urinating, such as a need to urinate often, a weak stream when urinating, or a feeling of not being able to empty the bladder completely.

Slideshow: How to Manage Your Overactive Bladder

Tamsulosin helps relax the muscles in the prostate and the opening of the bladder. This may help increase the flow of urine or decrease the symptoms. However, tamsulosin will not shrink the prostate. The prostate may continue to get larger. This may cause the symptoms to become worse over time. Therefore, even though tamsulosin may lessen the problems caused by enlarged prostate now, surgery still may be needed in the future.

tamsulosin is available only with your doctor's prescription.

Once a medicine has been approved for marketing for a certain use, experience may show that it is also useful for other medical problems. Although these uses are not included in product labeling, tamsulosin is used in certain patients with the following medical conditions:

  • Ureteric stone (a kidney stone that has moved down into the ureter).

Before Using tamsulosin

In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For tamsulosin, the following should be considered:

Allergies

Tell your doctor if you have ever had any unusual or allergic reaction to tamsulosin or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.

Pediatric

Tamsulosin is not indicated for use in the pediatric population.

Geriatric

Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of tamsulosin in the elderly.

Pregnancy

Pregnancy Category Explanation
All Trimesters B Animal studies have revealed no evidence of harm to the fetus, however, there are no adequate studies in pregnant women OR animal studies have shown an adverse effect, but adequate studies in pregnant women have failed to demonstrate a risk to the fetus.

Breast Feeding

There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.

Interactions with Medicines

Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking tamsulosin, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Using tamsulosin with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.

  • Boceprevir

Using tamsulosin with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

  • Atazanavir
  • Carbamazepine
  • Ceritinib
  • Clarithromycin
  • Cobicistat
  • Conivaptan
  • Dabrafenib
  • Eslicarbazepine Acetate
  • Indinavir
  • Itraconazole
  • Ketoconazole
  • Lopinavir
  • Mitotane
  • Nefazodone
  • Nelfinavir
  • Piperaquine
  • Posaconazole
  • Primidone
  • Ritonavir
  • Saquinavir
  • Siltuximab
  • Tadalafil
  • Telaprevir
  • Telithromycin
  • Voriconazole

Using tamsulosin with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

  • Acebutolol
  • Alprenolol
  • Atenolol
  • Avanafil
  • Betaxolol
  • Bevantolol
  • Bisoprolol
  • Bucindolol
  • Carteolol
  • Carvedilol
  • Celiprolol
  • Cimetidine
  • Dilevalol
  • Esmolol
  • Labetalol
  • Levobunolol
  • Mepindolol
  • Metipranolol
  • Metoprolol
  • Nadolol
  • Nebivolol
  • Oxprenolol
  • Penbutolol
  • Pindolol
  • Propranolol
  • Sildenafil
  • Sotalol
  • Talinolol
  • Tertatolol
  • Timolol
  • Vardenafil

Interactions with Food/Tobacco/Alcohol

Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Other Medical Problems

The presence of other medical problems may affect the use of tamsulosin. Make sure you tell your doctor if you have any other medical problems, especially:

  • Allergy to sulfa drugs (e.g., sulfamethoxazole, sulfasalazine, sulfasoxazole, Azulfidine®, Bactrim®, Septra®)—Increased allergic reaction risk in patients with this condition.
  • Hypotension (low blood pressure)—Use with caution. May make this conditions worse.
  • Kidney disease or
  • Liver disease—Use with caution. The effects may be increased because of slower removal of the medicine from the body.

Proper Use of tamsulosin

Take tamsulosin exactly as directed by your doctor. Do not take more of it, do not take it more often, and do not take it for a longer time than your doctor ordered.

tamsulosin comes with a patient information insert. Read and follow the instructions in the insert carefully. Ask your doctor if you have any questions.

Take the capsule approximately 30 minutes after the same meal each day. Swallow the capsule whole. Do not crush, chew, or open it.

Dosing

The dose of tamsulosin will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of tamsulosin. If your dose is different, do not change it unless your doctor tells you to do so.

The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.

  • For oral dosage form (capsules):
    • For benign prostatic hyperplasia:
      • Adults—At first, 0.4 milligram (mg) once a day. Your doctor may increase your dose if needed.
      • Children—Use is not recommended.

Missed Dose

If you miss a dose of tamsulosin, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.

Storage

Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.

Keep out of the reach of children.

Do not keep outdated medicine or medicine no longer needed.

Ask your healthcare professional how you should dispose of any medicine you do not use.

Precautions While Using tamsulosin

It is very important that your doctor check your progress at regular visits to make sure that tamsulosin is working properly and to check for unwanted effects.

Dizziness, lightheadedness, or fainting may occur after you take tamsulosin, especially when you get up from a lying or sitting position. Getting up slowly may help lessen this problem. If you feel dizzy, lie down so you do not faint. Then sit for a few moments before standing to prevent the dizziness from returning.

Because tamsulosin may cause some people to become dizzy or feel faint, make sure you know how you react to tamsulosin before you drive, use machines, or do anything else that could be dangerous if you are dizzy or not alert.

This medication may rarely cause a severe allergic reaction (swelling of face, tongue, or throat, difficulty breathing, and blistering of the skin. Check with your doctor immediately if this occurs.

You should seek medical attention right away if you experience a prolonged erection while using tamsulosin. This is an extremely rare unwanted effect that must be treated right away to prevent permanent erectile damage (impotence).

If you plan to have cataract surgery, tell your eye doctor (ophthalmologist) that you are taking tamsulosin or that you used tamsulosin in the past 9 months. A serious eye problem called Intraoperative Floppy Iris Syndrome (IFIS) has occurred in some patients who were taking tamsulosin or who had recently taken tamsulosin when they had cataract surgery.

Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.

tamsulosin Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

More common
  • Cough or hoarseness
  • fever or chills
  • lower back or side pain
  • painful or difficult urination
Less common
  • Chest pain
Rare
  • Dizziness or lightheadedness
  • dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  • fainting
  • feeling of constant movement of self or surroundings
  • painful or prolonged erection of the penis
  • sensation of spinning
Incidence not known
  • Blistering, peeling, or loosening of the skin
  • blurred vision
  • confusion
  • diarrhea
  • difficult or labored breathing
  • fast, pounding, or irregular heartbeat or pulse
  • itching
  • joint or muscle pain
  • large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
  • red skin lesions, often with a purple center
  • red, irritated eyes
  • sore throat
  • sores, ulcers, or white spots in the mouth or on the lips
  • sweating
  • tightness of the chest
  • unusual tiredness or weakness

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common
  • Abnormal ejaculation
  • back pain
  • body aches or pain
  • congestion
  • headache
  • lack or loss of strength
  • sneezing
  • stuffy or runny nose
  • tender, swollen glands in the neck
  • trouble swallowing
  • voice changes
Less common
  • Decreased interest in sexual intercourse
  • decreased sexual drive or performance
  • drowsiness
  • inability to have or keep an erection
  • increased cough
  • loss in sexual ability, desire, drive, or performance
  • nausea
  • pain or tenderness around the eyes and cheekbones
  • sleepiness or unusual drowsiness
  • tooth disorder
  • trouble sleeping
Incidence not known
  • Constipation
  • hives or welts
  • redness of the skin
  • skin rash
  • vomiting

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

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

See also: Side effects (in more detail)

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