- This medication contains Tamsulozin. Do not take Flomax if you are allergic to Tamsulozin or any ingredients contained in this drug
- Keep out of reach of children
- In case of overdose, get medical help or contact a Poison Control Center immediately
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Why it’s used
Tamsulozin is used to treat the symptoms of benign prostatic hyperplasia (BPH). BPH is a condition that can occur in men. With BPH, the prostate is enlarged but isn’t cancerous.
Symptoms of BPH include trouble urinating, and a frequent or urgent need to urinate that often occurs at night.
Tamsulozin dosing information
Usual Adult Dose for Benign Prostatic Hyperplasia:
Initial Dose: 0.4 mg orally once a day Maximum Dose: 0.8 mg orally once a day
Comments: -If use is discontinued or interrupted for several days at either the 0.4 mg or 0.8 mg dose, treatment should be initiated again with the 0.4 mg once a day dose.
Use: Treatment of the signs and symptoms of benign prostatic hyperplasia (BPH)
Taking certain antifungals with Tamsulozin can increase the levels of Tamsulozin in your body. This raises your risk of side effects from Tamsulozin. Examples of these drugs include:
- terbinafine (these drugs should be used together cautiously)
- ketoconazole (do not use this drug with Tamsulozin)
Before taking Tamsulozin,
- tell your doctor and pharmacist if you are allergic to Tamsulozin, sulfa medications, or any other medications.
- tell your doctor and pharmacist what prescription and nonprescription medications, vitamins, nutritional supplements and herbal products you are taking or plan to take. Be sure to mention any of the following: other alpha blocker medications such as alfuzosin (Uroxatral), doxazosin (Cardura), prazosin (Minipress), and terazosin (Hytrin); anticoagulants ('blood thinners') such as warfarin (Coumadin); cimetidine (Tagamet); and medications for erectile dysfunction (ED) such as sildenafil (Viagra), tadalafil (Cialis), or vardenafil (Levitra); Your doctor may need to change the doses of your medications or monitor you more carefully for side effects.
- tell your doctor if you have or have ever had prostate cancer or liver or kidney disease.
- you should know that Tamsulozin is only for use in men. Women should not take Tamsulozin, especially if they are pregnant or could become pregnant or are breast-feeding. If a pregnant woman takes Tamsulozin, she should call her doctor.
- if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking Tamsulozin. If you need to have eye surgery at any time during or after your treatment, be sure to tell your doctor that you are taking or have taken Tamsulozin.
- you should know that this medication may make you drowsy or dizzy. Do not drive a car, operate machinery, or perform dangerous tasks until you know how this medication affects you.
- you should know that Tamsulozin may cause dizziness, lightheadedness, a spinning sensation, and fainting, especially when you get up too quickly from a lying position. This is more common when you first start taking Tamsulozin or after your dose is increased. To help avoid this problem, get out of bed slowly, resting your feet on the floor for a few minutes before standing up. Call your doctor if these symptoms are severe or do not go away.
More common side effects
The more common side effects that can occur with Tamsulozin include:
- runny nose
- decreased semen
- loss of energy or muscle strength
- sore throat or trouble swallowing
- back or chest pain
If these side effects are mild, they may go away within a few days or a couple of weeks. If they’re more severe or don’t go away, talk to your doctor or pharmacist.
Before taking Tamsulozin, 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, especially of: low blood pressure, certain eye problems (cataracts, glaucoma).
This drug may make you dizzy or drowsy. Alcohol or marijuana (cannabis) can make you more dizzy or drowsy. Do not drive, use machinery, or do anything that needs alertness until you can do it safely. Limit alcoholic beverages. Talk to your doctor if you are using marijuana (cannabis).
Before having surgery (including cataract/glaucoma eye surgery), tell your doctor or dentist if you are taking or have ever taken this medication, and about all the other products you use (including prescription drugs, nonprescription drugs, and herbal products).
Older adults may be more sensitive to the side effects of this drug, especially dizziness and low blood pressure when getting up from a sitting or lying position. These side effects can increase the risk of falling.
During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.
It is unknown if this medication passes into breast milk. Consult your doctor before breast-feeding.
Dosage for benign prostatic hyperplasia (BPH)
- Form: oral capsule
- Strength: 0.4 mg
- Form: oral capsule
- Strength: 0.4 mg
Adult dosage (ages 18–64 years)
Typical dosage: 0.4-mg capsule daily.
Dosage increase: If your body doesn’t respond to the 0.4-mg dose after two to four weeks, your dosage may be increased to 0.8 mg daily.
Senior dosage (ages 65 years and older)
Your body may process this drug more slowly. Your doctor may start you on a lowered dosage so that levels of the drug don’t build up too high in your body. High levels of this drug in your body can be dangerous.
Disclaimer: Our goal is to provide you with the most relevant and current information. However, because drugs affect each person differently, we cannot guarantee that this list includes all possible dosages. This information is not a substitute for medical advice. Always speak with your doctor or pharmacist about dosages that are right for you.
Tamsulozin oral capsule is used for long-term treatment. It comes with risks if you don’t take it as prescribed.
If you stop taking the drug suddenly or don’t take it at all: Your BPH symptoms won’t improve. If you stop taking this drug for several days, talk to your doctor before starting again.
If you miss doses or don’t take the drug on schedule: Your medication may not work as well or may stop working completely. For this drug to work well, a certain amount needs to be in your body at all times.
If you take too much: Taking too much of this drug can cause low blood pressure. This can be dangerous.
If you think you’ve taken too much of this drug, call your doctor or seek guidance from the American Association of Poison Control Centers at 1-800-222-1222 or through their online tool. But if your symptoms are severe, call 911 or go to the nearest emergency room right away.
What to do if you miss a dose: Take your dose as soon as you remember. But if you remember just a few hours before your next scheduled dose, take only one dose. Never try to catch up by taking two doses at once. This could result in dangerous side effects.
How to tell if the drug is working: You should see a decrease in the symptoms of BPH. You may need to urinate less often, have less urgency to urinate, or have a stronger urine stream.
As with all medications, the costs of Tamsulozin can vary. To find current prices for your area, check out GoodRx.com.
Keep these considerations in mind if your doctor prescribes Tamsulozin for you.
What other drugs will affect Tamsulozin?
Tell your doctor about all medicines you use, and those you start or stop using during your treatment with, especially:
blood pressure medicine.
This list is not complete. Other drugs may interact with Tamsulozin, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.
What are the possible side effects of Tamsulozin (Flomax)?
Get emergency medical help if you have signs of an allergic reaction (hives, difficult breathing, swelling in your face or throat) or a severe skin reaction (fever, sore throat, burning eyes, skin pain, red or purple skin rash with blistering and peeling).
Stop using Tamsulozin and call your doctor at once if you have:
- a light-headed feeling, like you might pass out; or
- penis erection that is painful or lasts 4 hours or longer.
Tamsulozin lowers blood pressure and may cause dizziness or fainting, especially when you first start taking it. You may feel very dizzy when you first wake up. Avoid getting up too fast from a sitting or lying position, or you may feel dizzy.
Common side effects may include:
- abnormal ejaculation, decreased amount of semen;
- dizziness, drowsiness, weakness;
- runny nose, cough;
- back pain, chest pain;
- nausea, diarrhea;
- tooth problems;
- blurred vision;
- sleep problems (insomnia); or
- decreased interest in sex.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
How should I take Tamsulozin (Flomax)?
Your doctor may test your prostate specific antigen (PSA) to check for prostate cancer before you take Tamsulozin.
Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.
Tamsulozin is usually taken once a day, approximately 30 minutes after the same meal each day.
Swallow the capsule whole and do not crush, chew, break, or open it.
Your blood pressure will need to be checked often.
Some things can cause your blood pressure to get too low. This includes vomiting, diarrhea, or heavy sweating. Call your doctor if you are sick with vomiting or diarrhea.
Store at room temperature away from moisture and heat.
If you stop taking Tamsulozin for any reason, call your doctor before you start taking it again. You may need a dose adjustment.
What are the side effects of Flomax (Tamsulozin)?
The most common adverse effects of Flomax are
Other side effects include
More serious side effects of Flomax
The following have been observed in male patients during Flomax treatment:
- orthostatic hypotension (low blood pressure when rising from sitting or lying down position),
- priapism (prolonged erection), and an eye problem called intraoperative floppy iris syndrome (IFIS).
BPH can occur with more serious conditions such as prostate cancer. Before starting treatment with Tamsulozin, talk to your doctor about being screened for prostate cancer.
You will have regular checkups with your doctor. During these visits, your doctor will check whether your symptoms of BPH have improved.
There are other drugs available to treat your condition. Some may be better suited for you than others. Talk to your doctor about other options that may work for you.
How long does it take Tamsulozin to work?
Most people notice symptoms of BPH starting to improve within a week of taking Tamsulozin. This is the time it takes for the drug to build up in your body to a level that works. If urinating doesn’t get easier for you or you don’t have fewer urges to urinate within 2 weeks after starting this drug, tell your doctor. Your doctor may need to change your dosage or have you take another drug.
Healthline Medical Team Answers represent the opinions of our medical experts. All content is strictly informational and should not be considered medical advice.
Answers represent the opinions of our medical experts. All content is strictly informational and should not be considered medical advice.
- Low blood pressure warning: Tamsulozin can cause you to feel dizzy or cause a drop in your blood pressure when you stand up after sitting or lying down. After taking your first dose or an increased dose, be sure you’re aware of how Tamsulozin affects you before you perform any activity that could cause injury.
- Priapism warning: Rarely, Tamsulozin can cause priapism. This is a persistent, painful erection that isn’t related to sexual activity. If you have priapism, contact your doctor right away. If priapism isn’t treated, it could lead to permanent impotence (not being able to have an erection).
- Skin reactions warning: Though rare, this drug can cause severe skin reactions, including a serious condition called Stevens-Johnson syndrome. These skin reactions can cause raised welts, facial swelling, fever, and trouble breathing. See a doctor right away or call 911 if you have signs of a sudden or severe skin reaction after taking this drug.
- Intraoperative floppy iris syndrome (IFIS) warning: IFIS is a complication that can occur during surgery for cataracts or glaucoma. Although rare, this problem has been reported with people taking Tamsulozin. If you need to have cataract or glaucoma surgery, be sure to tell your doctor or surgeon that you’re taking Tamsulozin.
This drug comes with several warnings.