Buy Flomax
Flomax

0.74
Relaxes the muscles of the prostate and bladder to make urination easier for men with an enlarged prostate.


Ingredient
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Availability
In Stock
Delivery
Airmail (14-21 days) | EMS trackable (5-9 days)
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Product Sheet

Alternative/Local Brand
Flomax MR
Active Ingredient(s)
Tamsulosin
Primary Category
Prostate Health
Therapeutic Class
Alpha-adrenoceptor antagonist, Alpha-1 selective
Pharmacological Class
Alpha-blockers
Indications
Benign prostatic hyperplasia symptoms, Difficulty urinating
Contraindications
Severe liver failure, Fainting when getting up (orthostatic hypotension)
Minor Side Effects
Headache, Nausea, Runny nose
Moderate Side Effects
Dizziness, Ejaculation disorders, Palpitations
Serious Side Effects
Fainting, Priapism (persistent painful erection), Intraoperative Floppy Iris Syndrome (during eye surgery)
Dosage Forms
Modified-release capsule
Administration Route
Oral
Mechanism of Action
It works by relaxing the muscles in the prostate and the urethra (the tube that carries urine out of the body). This relaxation allows urine to pass more easily and reduces the urge to urinate frequently.
Prescription Status
Rx
Manufacturer
Sanofi
Patient Summary
Relaxes the muscles of the prostate and bladder to make urination easier for men with an enlarged prostate.
Onset Time
4-8 hours
Duration
24 hours
Storage Instructions
Store in the original package at room temperature.
Drug Interactions
Ketoconazole, Other alpha-blockers, Warfarin
Age Restrictions
Adult males over 18
Pregnancy Use
Not intended for use by women.
Alternative Drugs
Alfuzosin, Terazosin, Doxazosin

Flomax: Tamsulosin Overview

Flomax is a brand-name medication that contains tamsulosin as its active ingredient. It belongs to the men’s health category and is marketed as a pill in strengths of 0.2 mg and 0.4 mg. In Hong Kong, Flomax is a prescription (Rx) product regulated by the Department of Health under the Pharmacy and Poisons Ordinance.

How Flomax Works in the Body

Tamsulosin is a selective α1-adrenergic receptor antagonist. By blocking α1-receptors located in the smooth muscle of the prostate, bladder neck, and urethra, it reduces muscle tone in these areas. The result is a relaxation of the urinary outflow tract, which improves urine flow and relieves the symptoms of benign prostatic hyperplasia (BPH).

  • Onset of action: Usually within a few days, with maximal symptom relief observed after several weeks of consistent use.
  • Duration: The effect lasts for the entire dosing interval (once daily).
  • Metabolism: Primarily metabolised by the liver (CYP3A4 and CYP2D6 pathways) and excreted in the urine and feces.

Conditions Treated with Flomax

Flomax is approved in Hong Kong for the treatment of lower urinary tract symptoms (LUTS) associated with benign prostatic hyperplasia. The medication is indicated for adult men who experience urinary frequency, urgency, weak stream, or incomplete bladder emptying due to an enlarged prostate.

Typical patient profiles include:

  • Men aged ≥ 50 years with clinically diagnosed BPH.
  • Individuals whose symptoms interfere with daily activities or quality of life.

Off-Label and Investigational Applications

Evidence-Based Off-Label Uses

  • Facilitation of ureteral stone passage: Small clinical studies suggest that tamsulosin may help relax ureteral smooth muscle, potentially increasing the likelihood of spontaneous stone expulsion. This use is not approved by the Hong Kong regulatory authorities and should be considered only under specialist supervision.

Disclaimer: Off-label use requires medical supervision and an individualized risk assessment.

No other off-label indications have robust peer-reviewed support for routine use.

Who Should (Not) Use Flomax?

Absolute Contraindications

  • Known hypersensitivity to tamsulosin or any tablet excipients.
  • Severe hepatic impairment (Child-Pugh class C).

Relative Contractions

  • Moderate hepatic impairment (Child-Pugh class A or B) - dose may need adjustment (0.2 mg).
  • History of orthostatic hypotension or syncopal episodes.
  • Concurrent use of strong CYP3A4 or CYP2D6 inhibitors (e.g., ketoconazole, quinidine).

Special Populations

  • Pregnancy & lactation: Not indicated; safety not established.
  • Elderly: Start with the lowest effective dose (0.2 mg) and monitor for dizziness or falls.

Safety Profile: Side Effects and Interactions

Common Side Effects

  • Dizziness or light-headedness, especially after the first dose.
  • Ejaculatory disorders (e.g., decreased volume, retrograde ejaculation).
  • Nasal congestion or runny nose.

These effects are usually mild and often improve with continued therapy.

Serious Adverse Events

  • Hypotension leading to fainting or falls.
  • Severe allergic reactions (rash, swelling, airway compromise).
  • Interstitial nephritis (rare).

If any of these occur, seek immediate medical attention.

Drug Interactions

  • Major: Concurrent strong CYP3A4 inhibitors (ketoconazole, itraconazole) can increase tamsulosin plasma levels, raising the risk of hypotension.
  • Moderate: Drugs affecting blood pressure (e.g., antihypertensives, nitrates) may have additive hypotensive effects; dose adjustments or monitoring may be necessary.
  • Other: No clinically relevant interaction with most over-the-counter analgesics, but always inform the prescriber of all medicines, supplements, and herbal products.

Food and Lifestyle Interactions

  • Take Flomax after the same meal each day to minimise fluctuations in absorption.
  • Alcohol may enhance dizziness; limit excessive intake.
  • Operating heavy machinery or driving is generally safe, but avoid these activities until you know how the medication affects you.

How to Take Flomax

  • Standard dose: 0.4 mg (one pill) taken once daily after a meal.
  • Reduced dose: 0.2 mg may be prescribed for patients with moderate liver impairment or those who experience pronounced dizziness.
  • Swallow the pill whole; do not crush or chew.
  • If you miss a dose, take it as soon as you remember unless it is near the time of the next scheduled dose; do not double the dose.
  • Overdose: Symptoms may include severe hypotension, fainting, or rapid heart rate. Seek emergency medical care; supportive measures (IV fluids, monitoring) are the mainstay of treatment.

Tapering: Flomax does not require a taper; it can be stopped abruptly under medical guidance, though symptom recurrence may be noticed.

Monitoring and Follow-Up

  • Blood pressure: Check periodically, especially after dose initiation or when adding other blood-pressure-lowering agents.
  • Renal and hepatic function: Baseline labs are advisable; repeat if clinically indicated.
  • Symptom assessment: Evaluate improvement in urinary flow and any adverse effects at each follow-up visit (typically 4-6 weeks after starting therapy).

Storage and Handling

  • Store Flomax tablets at room temperature (15-30 °C), away from excess moisture and direct sunlight.
  • Keep the container tightly closed and out of reach of children.
  • Do not use tablets past the expiration date printed on the packaging.

Medication-Specific Glossary

α1-Adrenergic Receptor Antagonist
A drug that blocks α1 receptors, reducing smooth-muscle contraction in the prostate and bladder neck, thereby improving urinary flow.
Orthostatic Hypotension
A drop in blood pressure that occurs when standing up quickly, which can cause dizziness or fainting.
Child-Pugh Classification
A scoring system used to assess the severity of chronic liver disease and guide medication dosing.

Medical Disclaimer

This article provides educational information about Flomax and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.

Flomax FAQ

What is the difference between the 0.2 mg and 0.4 mg strengths of Flomax?

The 0.4 mg dose is the standard starting dose for most adult men with BPH, providing effective prostate smooth-muscle relaxation. The 0.2 mg dose is reserved for patients with moderate liver impairment or those who experience significant dizziness at the higher dose.

Can Flomax be taken with other blood-pressure medications?

Yes, but combined use may increase the risk of low blood pressure. Your doctor may adjust the dose of either medication or monitor you more closely to avoid hypotension.

Why should Flomax be taken after the same meal each day?

Food influences the absorption of tamsulosin; taking it consistently after the same meal helps maintain stable blood levels and reduces variability in symptom control.

Is retrograde ejaculation a permanent side effect of Flomax?

Retrograde ejaculation is typically reversible and resolves after the medication is discontinued, though it may persist in some individuals.

Can Flomax help dissolve kidney stones?

Tamsulosin can relax the ureter, potentially facilitating the passage of small stones, but this use is off-label and should only be considered under specialist supervision.

What should I do if I feel dizzy after the first dose?

Sit or lie down until the dizziness passes, avoid sudden standing, and inform your prescriber. They may recommend starting with the 0.2 mg dose or adjusting other medications.

Are there any dietary restrictions while on Flomax?

No specific foods must be avoided, but maintaining a consistent meal schedule around dosing helps keep drug absorption steady.

How long does it take to notice improvement in urinary symptoms?

Most men experience symptom relief within a few days, with maximal benefit usually observed after 2-4 weeks of continuous therapy.

Will Flomax affect my ability to drive?

If you experience dizziness or low blood pressure, you should refrain from driving until you know how the medication affects you. Most patients can drive safely once stabilized.

Return unused pills to a pharmacy’s medication-take-back program or follow local hazardous-waste disposal guidelines. Do not flush them down the toilet.

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