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MEDICAL INFORMATION
Flomax Key Facts
What is Flomax?
Flomax is the brand name for tamsulosin and is available as an oral capsule.
What dosages is Flomax available in?
Flomax is available as a 0.4mg oral capsule.
What is Flomax used for?
Flomax is an alpha-1 blocker that is used to treat an enlarged prostate (benign prostatic hyperplasia, BPH).
How does Flomax work?
Flomax is an alpha-1 blocker. It blocks a specific type of receptor found in the prostate. By blocking these receptors, the medication works by relaxing the muscles in your prostate and bladder, which relieves symptoms of BPH by making it easier to urinate.
How do I take Flomax?
Flomax is typically taken by mouth as 0.4 mg once a day, 30 minutes after the same meal each day. The maximum daily dose is 0.8 mg once a day.
Is it safe for me to take Flomax?
Flomax is a safe and effective treatment when used for FDA licensed indications. However, like all medications, they may give you unwanted side effects. You should always discuss potential side effects with your physician to ensure the medication is suitable and right for you.
Flomax Common Side Effects
Common side effects of Flomax include:
- Headache
- Dizziness
- Stuffy nose
- Abnormal ejaculation
- Diarrhea
- Back pain
Flomax Serious Side Effects
Serious side effects are rare with Flomax. Contact your healthcare provider immediately if you experience any of the following.
- Serious allergic reactions: rash, hives, trouble breathing, swelling of your face, lips, tongue, or throat
Effects of other drugs, drug classes and over-the-counter products on Flomax
The following medications may interact with Flomax:
- Flomax should not be used with strong inhibitors of CYP3A4 (e.g., ketoconazole)
- Flomax capsules should be used with caution in combination with moderate inhibitors of CYP3A4 (e.g., erythomycin), in combination with strong (e.g.,paroxetine) or moderate (e.g.,terbinafine) inhibitors of CYP2D6, or in patients known to be CYP2D6 poor metabolizers, particularly at a dose higher than 0.4 mg (e.g., 0.8 mg)
- Concomitant use of PDE5 inhibitors with tamsulosin can potentially cause symptomatic hypotension
Who makes Flomax?
Boehringer Ingelheim Pharmaceuticals, Inc.
Is Flomax safe in pregnancy?
It is not known if Flomax will harm your unborn baby. You should talk to your healthcare provider before taking this medication if you are pregnant.
What is the generic name for Flomax?
Medical Disclaimer
NowPatient has taken all reasonable steps to ensure that all material is factually accurate, complete, and current. However, the knowledge and experience of a qualified healthcare professional should always be sought after instead of using the information on this page. Before taking any drug, you should always speak to your doctor or another qualified healthcare provider.
The information provided here about medications is subject to change and is not meant to include all uses, precautions, warnings, directions, drug interactions, allergic reactions, or negative effects. The absence of warnings or other information for a particular medication does not imply that the medication or medication combination is appropriate for all patients or for all possible purposes.
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Report to Yellow Card (UK) or MedWatch (US)
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Meet Our Medical Team
We are a broad skilled and passionate group of clinicians with experience of operating in health systems in the United Kingdom & United States. Providing excellent care and advice is at the heart of everything we do. You can read more about our medical team by visiting the medical team page or learn more about how we curate content by visiting our editorial process
Navin Khosla
UK Responsible Person (UKRP), Pharmacist Independent Prescriber, Clinical Safety Officer (CSO), Pharmacist
Ketan Patel
Pharmacist Independent Prescriber, Pharmacist
Aseel Hamoud Bedan
Hospital Consultant
Jamie Winn
US Board Certified Pharmacist
Daniel Cheung
Pharmacist Independent Prescriber, Pharmacist
Amish Patel
Pharmacist Independent Prescriber, Superintendant Pharmacist, Pharmacist
Monica Khosla
Medical Writer
Rajive Patel
Medical Writer
Ihtesham Sabri
Medical Director
Stefano Mirabello
Pharmacist Independent Prescriber, Clinical Safety Officer (CSO), Pharmacist
DeLon Canterbury
US Board Certified Pharmacist/PGX & Deprescribing Specialist