Tamsulosin
Tamsulosin hydrochloride · Say it: tam-SOO-loh-sin hy-droh-KLOR-ide
A prescription capsule taken once a day to ease the urinary symptoms of an enlarged prostate (benign prostatic hyperplasia).
Used for
The label says it is used to treat the signs and symptoms of benign prostatic hyperplasia (BPH), a condition the doctor may call an enlarged prostate. The label says it is not indicated for treating high blood pressure. It is not for women or children.
Comes as
0.4 mg hard gelatin capsules (white cap and body with 0.4 mg printed on it, filled with white to off-white pellets); Supplied in bottles of 90 and 500 capsules
Common side effects
Headache, Dizziness, Runny or stuffy nose (rhinitis)
| Generic name | Tamsulosin hydrochloride |
|---|---|
| Brand names | — |
| Type of medicine | An alpha-blocker medicine. The label calls it an alpha 1 adrenoceptor antagonist that acts on the prostate. The FDA class is not listed. |
| How it is sold | Prescription capsule taken by mouth |
| Comes as | 0.4 mg hard gelatin capsules (white cap and body with 0.4 mg printed on it, filled with white to off-white pellets); Supplied in bottles of 90 and 500 capsules |
| Route | oral |
| Boxed warning | No |
| Label date | 2026-01-01 |
💊 What is Tamsulosin used for?
- The label says it is used to treat the signs and symptoms of benign prostatic hyperplasia (BPH), a condition the doctor may call an enlarged prostate. The label says it is not indicated for treating high blood pressure. It is not for women or children.
How it works
The label describes tamsulosin as an antagonist (blocker) of alpha 1A adrenoceptors in the prostate. Blocking these receptors is the way the medicine is described as working in the prostate.
How it is usually taken
- The label says to take it once a day, about 30 minutes after the same meal each day. The capsule should be swallowed whole. It should not be crushed, chewed, or opened. The label says the dose may be increased for people who do not respond after 2 to 4 weeks, and that therapy should restart at the starting dose if it has been stopped or interrupted for several days. Follow the instructions from your prescriber or pharmacist.
Comes as
- 0.4 mg hard gelatin capsules (white cap and body with 0.4 mg printed on it, filled with white to off-white pellets)
- Supplied in bottles of 90 and 500 capsules
⚠️ Tamsulosin side effects
Common side effects
- Headache
- Dizziness
- Runny or stuffy nose (rhinitis)
- Infection
- Abnormal ejaculation
- Weakness (asthenia)
- Back pain
- Diarrhea
- Sore throat (pharyngitis)
- Chest pain
- Increased cough
- Sleepiness (somnolence)
- Nausea
- Sinus infection (sinusitis)
- Trouble sleeping (insomnia)
- Decreased sex drive (libido)
Get medical help right away if
- Get medical help right away if you faint or have dizziness, lightheadedness, or severe symptoms that do not improve. The label says that if symptoms are severe or do not improve, you should call your doctor.
- Get medical help right away if you have swelling of the face, tongue, or throat.
- Get medical help right away if you have difficulty breathing.
- Get medical help right away if you have blistering of the skin.
- Get medical help right away if you have a painful erection that will not go away (priapism). The label says this is extremely rare, but if it is not treated promptly it can lead to permanent erectile dysfunction (impotence).
🛑 Who should not take Tamsulosin, and who should be careful
The label says not to take it if
- You are allergic to tamsulosin or any of its ingredients. The label lists skin rash, hives, itching, swelling, and breathing symptoms as reactions seen with this allergy.
- You are already taking certain blood pressure medicines. The label says you should not take tamsulosin in that case.
- You are taking a strong CYP3A4 inhibitor, such as ketoconazole. The label says it should not be used with these.
- You are taking other alpha-adrenergic blocking agents. The label says these should not be used together.
- The label says it is not for women or children.
Tell your doctor before taking it if
- Tell your doctor about any kidney or liver problems.
- Tell your doctor if you have had low blood pressure.
- Tell your doctor about any allergies to sulfa or other medicines.
- Tell your doctor if you are planning cataract or glaucoma surgery. The label says to tell the eye surgeon (ophthalmologist) that you have taken this medicine.
- Tell your doctor about all medicines you take, including prescription, non-prescription, vitamins, and herbal supplements, especially blood pressure medicines.
- Know that the label says to change positions slowly, because the medicine can cause a sudden drop in blood pressure when standing. The label also says to be careful about driving, operating machinery, or doing hazardous tasks.
- The label says you should be screened for prostate cancer before treatment and at regular intervals afterwards, because prostate cancer and BPH often occur together.
🔀 Tamsulosin with other medicines, food and alcohol
The label says to discuss these with your doctor or pharmacist
- Strong CYP3A4 inhibitors, such as ketoconazole: should not be used together.
- Moderate CYP3A4 inhibitors, such as erythromycin: use only with caution.
- Strong or moderate CYP2D6 inhibitors, such as paroxetine and terbinafine: use only with caution.
- Cimetidine: use only with caution.
- PDE5 inhibitors: the label says these can together cause symptomatic low blood pressure, so caution is advised.
- Warfarin: caution is advised with this combination.
- Other alpha-adrenergic blockers: should not be used together.
- Blood pressure medicines: tell your doctor, as the label says some may affect how tamsulosin works.
Alcohol and food
The label does not mention alcohol. It does say to take the capsule about 30 minutes after the same meal each day.
🤰 Tamsulosin in pregnancy and breastfeeding
Pregnancy
The label says tamsulosin is not indicated for use in women. It also says there are no adequate data on the developmental risk in pregnant women. Animal studies in rats and rabbits did not show adverse developmental effects.
Breastfeeding
The label does not say.
🗓️ Storage, missed doses and taking too much
Storage
Store at 25°C (77°F). Short excursions between 15°C and 30°C (59°F to 86°F) are permitted. Keep this medicine and all medicines out of reach of children.
If a dose is missed
The label says to take a missed dose as soon as you remember. If you miss the whole day, continue with your next dose on your regular schedule. Do not take two doses at the same time. If you stop or forget to take it for several days, talk with your doctor before starting again.
If too much is taken
The label says that if you take more than prescribed, you should call your doctor right away. In the label's section for healthcare providers, overdose that causes low blood pressure is managed by supporting the cardiovascular system, including keeping the patient lying down and considering IV fluids. The label also says dialysis is unlikely to help, because the drug is highly protein bound.
🗒️ Questions to ask about Tamsulosin
🎯 Check what you understood
1. According to the label, when should tamsulosin be taken each day?
2. What does the label say about crushing or opening the capsule?
3. Which of these does the label say is NOT an approved use of tamsulosin?
❓ Tamsulosin: frequently asked questions
What is tamsulosin used for?
The label says it treats the signs and symptoms of benign prostatic hyperplasia, a condition sometimes called an enlarged prostate. It is not indicated for high blood pressure.
Can I take tamsulosin with ketoconazole?
The label says tamsulosin should not be used with strong CYP3A4 inhibitors such as ketoconazole. Ask your prescriber or pharmacist about your own medicines.
What should I do if I feel dizzy after taking tamsulosin?
The label says to sit or lie down until you feel better. If the symptoms are severe or do not improve, call your doctor.
Is tamsulosin safe during pregnancy?
The label says it is not indicated for use in women and that there are no adequate data on developmental risk in pregnant women. Talk with your prescriber about any questions.
What should I do if I miss a dose?
The label says to take it as soon as you remember. If it is almost time for the next dose or you missed the whole day, continue on your regular schedule and do not take two doses at once.
🧪 Tests and reports linked to Tamsulosin
The label text mentions these. If you have one of these reports, get every line of it explained.
- Kidney function tests
a test or report linked to this medicine
- Metabolic panel (BMP, CMP)
a test or report linked to this medicine
- Culture and sensitivity
a test or report linked to this medicine
- Urinalysis
a test or report linked to this medicine
- Liver function tests
a test or report linked to this medicine
- Pregnancy hCG test
a test or report linked to this medicine
📖 Medical words used on this page
- Allergic reaction
An allergic reaction is when the immune system overreacts to something harmless, such as a medicine or food, causing symptoms from a rash to swelling.
- Alpha-blocker
An alpha-blocker is a medicine that relaxes certain muscles, used to ease urine flow in an enlarged prostate and sometimes to lower blood pressure.
- Angina
Angina is chest pain or tightness caused by the heart muscle not getting enough blood and oxygen, usually from narrowed heart arteries.
- Benign
Benign means not cancer. A benign growth does not spread to other parts of the body.
- Benign prostatic hyperplasia
Benign prostatic hyperplasia (BPH) is non-cancerous growth of the prostate gland, common with age, which can make passing urine harder.
- Cataract
A cataract is clouding of the normally clear lens inside the eye, causing blurred or dim vision.
- CYP3A
CYP3A is a family of enzymes, mainly in the liver and gut, that break down a large share of commonly used medicines.
- CYP3A Inhibitor
A CYP3A inhibitor is a medicine or food that slows the liver enzyme CYP3A, which can make other medicines build up in the body.
- CYP3A4
CYP3A4 is a liver and gut enzyme that breaks down many medicines. Drugs or foods that block or boost it can change medicine levels.
- Dialysis
Dialysis is a treatment that removes waste and extra fluid from the blood when the kidneys can no longer do this well enough.
- Edema
Edema is swelling caused by extra fluid trapped in the body's tissues, often in the feet, ankles and legs.
- Erectile dysfunction
Erectile dysfunction (ED) means difficulty getting or keeping an erection firm enough for sex. It is common and often treatable.
- Glaucoma
Glaucoma is a group of eye conditions where the optic nerve is damaged, often linked to raised pressure inside the eye, which can affect sight.
- Hypertension
Hypertension means high blood pressure: the force of blood against artery walls stays higher than it should over time.
📖 Medical words on this page
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Have the leaflet or prescription in front of you?
Explain my leafletDecode my prescription🔗 Trusted sources about Tamsulosin
- Full official label on DailyMed ↗
US National Library of Medicine: the complete FDA label this page is based on
- Tamsulosin on MedlinePlus ↗
US National Library of Medicine's patient drug information
- Tamsulosin on the NHS website ↗
UK National Health Service medicine guide
Report a side effect or check safety alerts
- Report a side effect in the US (FDA MedWatch) ↗
- Report a side effect in the UK (Yellow Card) ↗
- FDA recalls and safety alerts ↗
Explain your own documents
Source: official FDA drug label (label updated 2026-01-01). Read the full label on DailyMed
MedicDecode explains the official label in plain words. It is not medical advice and does not replace your doctor or pharmacist. Never start, stop or change a medicine because of what you read here.