Flomax Side Effects

Generic Name: tamsulosin

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

Not all side effects for Flomax may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

For the Consumer

Applies to tamsulosin: oral capsule

In addition to its needed effects, some unwanted effects may be caused by tamsulosin (the active ingredient contained in Flomax). In the event that any of these side effects do occur, they may require medical attention.

You should check with your doctor immediately if any of these side effects occur when taking tamsulosin:

More common
  • Cough or hoarseness
  • fever or chills
  • lower back or side pain
  • painful or difficult urination
Less common
  • Chest pain
Rare
  • 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 of the side effects that can occur with tamsulosin may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

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
  • redness of the skin
  • skin rash
  • vomiting

For Healthcare Professionals

Applies to tamsulosin: oral capsule

General

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

Immunologic

Very common (10% or more): Infection (up to 10.8%)
Uncommon (0.1% to 1%): Flu like symptoms
Rare (less than 0.1%): Angioedema[Ref]

Cardiovascular

Common (1% to 10%): Chest pain
Uncommon (0.1% to 1%): Orthostatic hypotension
Postmarketing reports: Palpitations, hypotension, atrial fibrillation, arrhythmia, tachycardia[Ref]

Dermatologic

Uncommon (0.1% to 1%): Rash, pruritus, urticaria
Postmarketing reports: Stevens-Johnson syndrome, erythema multiforme, exfoliative dermatitis, skin desquamation[Ref]

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[Ref]

Genitourinary

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[Ref]

Respiratory

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[Ref]

Musculoskeletal

Common (1% to 10%): Back pain[Ref]

Gastrointestinal

Common (1% to 10%): Diarrhea, nausea, tooth disorder
Uncommon (0.1% to 1%): Constipation, vomiting
Frequency not reported: Dry mouth[Ref]

Ocular

Common (1% to 10%): Blurred vision
Postmarketing reports: Visual impairment, intraoperative Floppy Iris Syndrome (IFIS)[Ref]

Other

Common (1% to 10%): Asthenia, decreased libido
Uncommon (0.1% to 1%): Fatigue[Ref]

Psychiatric

Common (1% to 10%): Insomnia[Ref]

References

1. Cerner Multum, Inc. "Australian Product Information." O 0

2. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0

3. "Product Information. Flomax (tamsulosin)." Boehringer-Ingelheim, Ridgefield, CT.

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