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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 SummaryCommon 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 ConsumerApplies 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
Less common
Rare
Incidence not known
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
Less common
Incidence not known
For Healthcare Professionals
Applies to tamsulosin: oral capsule
GeneralThe most commonly reported side effects were abnormal ejaculation, influenza-like symptoms, headache, dizziness, and rhinitis.
ImmunologicVery common (10% or more): Infection (up to 10.8%)
Uncommon (0.1% to 1%): Flu like symptoms
Rare (less than 0.1%): Angioedema
CardiovascularCommon (1% to 10%): Chest pain
Uncommon (0.1% to 1%): Orthostatic hypotension
Postmarketing reports: Palpitations, hypotension, atrial fibrillation, arrhythmia, tachycardia
DermatologicUncommon (0.1% to 1%): Rash, pruritus, urticaria
Postmarketing reports: Stevens-Johnson syndrome, erythema multiforme, exfoliative dermatitis, skin desquamation
Nervous systemVery 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
GenitourinaryVery 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
RespiratoryVery 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
MusculoskeletalCommon (1% to 10%): Back pain
GastrointestinalCommon (1% to 10%): Diarrhea, nausea, tooth disorder
Uncommon (0.1% to 1%): Constipation, vomiting
Frequency not reported: Dry mouth
OcularCommon (1% to 10%): Blurred vision
Postmarketing reports: Visual impairment, intraoperative Floppy Iris Syndrome (IFIS)
OtherCommon (1% to 10%): Asthenia, decreased libido
Uncommon (0.1% to 1%): Fatigue
PsychiatricCommon (1% to 10%): Insomnia
Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/3/2022.
Source: Drugs.com Flomax (www.drugs.com/flomax.html).
February 8, 2021
July 1, 2020
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May 24, 2022