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Flomax Prescription
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Generic Name: tamsulosin (tam soo LOE sin)
Brand Names: Flomax
Flomax (tamsulosin) is used to improve urination in men with benign prostatic hyperplasia. Includes Flomax side effects, interactions and indications. Average Savings for tamsulosin hydrochloride (generic): 51%
Generic Name: tamsulosin (tam soo LOE sin)
Brand Names: Flomax
Flomax (tamsulosin) is used to improve urination in men with benign prostatic hyperplasia. Includes Flomax side effects, interactions and indications. Average Savings for tamsulosin hydrochloride (generic): 51%
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30 tablets of Flomax 40 mg
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Flomax Drug Information:

Flomax (tamsulosin) is an alpha-blocker that relaxes the muscles in the prostate and bladder neck, making it easier to urinate. Flomax is used to improve urination in men with benign prostatic hyperplasia (enlarged prostate). Flomax is not approved for use in women or children. You should not use Flomax if you are allergic to tamsulosin. Do not take tamsulosin with other similar medicines such as alfuzosin (Uroxatral), Doxazosin (Cardura), prazosin (Minipress), Silodosin (Rapaflo), or terazosin (Hytrin). Learn more

Flomax Side Effects

Note: This document contains side effect information about tamsulosin. Some of the dosage forms listed on this page may not apply to the brand name Flomax.

In Summary

Common side effects of Flomax include: dizziness, nasal congestion, paranasal sinus congestion, rhinitis, rhinorrhea, and seasonal allergic rhinitis. Other side effects include: drowsiness. See below for a comprehensive list of adverse effects.

For the Consumer

Applies to tamsulosin: oral capsule

Along with its needed effects, tamsulosin (the active ingredient contained in Flomax) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking tamsulosin:

More common

  • Cough or hoarseness
  • fever or chills
  • lower back or side pain
  • painful or difficult urination

Less common

  • Chest pain


  • Dizziness or lightheadedness
  • dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  • fainting
  • feeling of constant movement of self or surroundings
  • painful or prolonged erection of the penis
  • sensation of spinning

Incidence not known

  • Blistering, peeling, or loosening of the skin
  • blurred vision
  • confusion
  • diarrhea
  • difficult or labored breathing
  • fast, pounding, or irregular heartbeat or pulse
  • itching
  • joint or muscle pain
  • large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
  • red skin lesions, often with a purple center
  • red, irritated eyes
  • sore throat
  • sores, ulcers, or white spots in the mouth or on the lips
  • sweating
  • tightness of the chest
  • unusual tiredness or weakness

Some side effects of tamsulosin may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

  • Abnormal ejaculation
  • back pain
  • body aches or pain
  • congestion
  • headache
  • lack or loss of strength
  • sneezing
  • stuffy or runny nose
  • tender, swollen glands in the neck
  • trouble swallowing
  • voice changes

Less common

  • Decreased interest in sexual intercourse
  • decreased sexual drive or performance
  • drowsiness
  • inability to have or keep an erection
  • increased cough
  • loss in sexual ability, desire, drive, or performance
  • nausea
  • pain or tenderness around the eyes and cheekbones
  • sleepiness or unusual drowsiness
  • tooth disorder
  • trouble sleeping

Incidence not known

  • Constipation
  • hives or welts, skin rash
  • redness of the skin
  • vomiting

For Healthcare Professionals

Applies to tamsulosin: oral capsule


The most commonly reported side effects were abnormal ejaculation, influenza-like symptoms, headache, dizziness, and rhinitis.


Very common (10% or more): Infection (up to 10.8%)

Uncommon (0.1% to 1%): Flu like symptoms

Rare (less than 0.1%): Angioedema


Common (1% to 10%): Chest pain

Uncommon (0.1% to 1%): Orthostatic hypotension

Postmarketing reports: Palpitations, hypotension, atrial fibrillation, arrhythmia, tachycardia


Uncommon (0.1% to 1%): Rash, pruritus, urticaria

Postmarketing reports: Stevens-Johnson syndrome, erythema multiforme, exfoliative dermatitis, skin desquamation

Nervous system

Very common (10% or more): Headache (up to 21.1%), dizziness (up to 17.1%)

Common (1% to 10%): Somnolence, insomnia

Rare (less than 0.1%): Syncope

Frequency not reported: Vertigo


Very common (10% or more): Abnormal ejaculation (up to 18.1%)

Common (1% to 10%): Ejaculation disorders, including retrograde ejaculation and ejaculation failure

Uncommon (0.1% to 1%): Semen volume reduced, ejaculation delayed

Postmarketing reports: Priapism


Very common (10% or more): Rhinitis (up to 17.9%)

Common (1% to 10%): Pharyngitis, Increased cough, sinusitis

Uncommon (0.1% to 1%): Nasal congestion

Postmarketing reports: Dyspnea, epistaxis


Common (1% to 10%): Back pain


Common (1% to 10%): Diarrhea, nausea, tooth disorder

Uncommon (0.1% to 1%): Constipation, vomiting

Frequency not reported: Dry mouth


Common (1% to 10%): Blurred vision

Postmarketing reports: Visual impairment, intraoperative Floppy Iris Syndrome (IFIS)


Common (1% to 10%): Asthenia, decreased libido

Uncommon (0.1% to 1%): Fatigue


Common (1% to 10%): Insomnia

Editorial References and Review

Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/3/2022.

Source: Drugs.com Flomax (www.drugs.com/flomax.html).