Flomax Capsules (Tamsulosin)

(℞) Prescription Required

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Tamsulosin 0.4mg

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Manufactured by: UK Various Generics
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Tamsulosin 0.4mg
Product of United Kingdom
Manufactured by UK Various Generics
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Flomax Capsules 0.4mg

Product of Turkey
Manufactured by: Astellas Pharma Ltd
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Flomax Capsules 0.4mg
Product of Turkey
Manufactured by Astellas Pharma Ltd
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Flomax (Tamsulosin) Medication Information


Flomax is an alpha antagonist used for the treatment of the signs and symptoms of benign prostatic hyperplasia or BPH.


The Flomax capsules are available in 0.4 mg strength. 

Side Effects

The most common side effects of Flomax include:

  • Headache
  • Dizziness
  • Rhinitis
  • Infection
  • Abnormal ejaculation
  • Asthenia
  • Back pain
  • Diarrhea
  • Somnolence
  • Nausea

For a full list of side effects that apply to you, do not hesitate to contact your pharmacist or doctor.


Advise patients about the possibility of symptoms related to postural low blood pressure.

Patients should be advised about the possibility and seriousness of priapism.

Intraoperative Floppy Iris Syndrome has been seen during cataract surgery in some patients. Patients considering cataract surgery should tell their ophthalmologist that they have taken Flomax. 

Advise patients to be screened for prostate cancer before treatment and at regular intervals afterward.


Common medications that interact with Flomax are listed:

  • Ketoconazole
  • Erythromycin
  • Paroxetine
  • Terbinafine
  • Sildenafil
  • Warfarin 

For more information, do not hesitate to ask your doctor or pharmacist.


Store at controlled room temperature (77ºF). 

Pharmacist Tips

  • Low blood pressure with position changes can occur, a symptom of this includes dizziness. Use caution when driving, or performing hazardous tasks.
  • Priapism is a possibility and if this occurs seek immediate medical attention.
  • If you are having cataract surgery tell your ophthalmologist that you have been taking Flomax.

Tamsulosin FAQs

Should this be taken with or without food?

The dose should be taken 30 minutes after the same meal every day.


Can I crush this medication?

No, you cannot crush or chew the capsule.


Does Flomax keep you from ejaculating?

One of the side effects seen with Flomax is abnormal ejaculation, which can be the inability to ejaculate or have trouble ejaculating


Does Flomax make you pee more?

Tamsulosin relieves the pressure on the bladder muscles, so you can pee more easily.


How long does it take to work?

BPH relief can be seen in as little as one week, with the effect being seen up to 13 weeks after starting Flomax


Is Flomax worth taking?

Tamsulosin can help with enlarged prostates, but it does have side effects as with any medication. Speak with your doctor or pharmacist to get more answers and information.


Related Drugs


Flomax {package insert}. Deerfield, IL: Boehringer Ingelheim Pharmaceuticals, Inc.; 2009.


PharmD Medical Writer

Author: Dr. Larisa Roybal, PharmD

Dr. Roybal is a board-certified pharmacotherapy specialist who has practiced in both ambulatory and acute care settings. Her pharmacy interests include oncology and general inpatient pharmacy.

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The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

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