Compare Avodart vs. Flomax

Head-to-head comparisons of medication uses, side effects, ratings, and more.


Avodart (dutasteride)

Prescription only

Flomax (tamsulosin)

Prescription only
Improves prostate symptoms and lowers the urgency to urinate.

Avodart (dutasteride) reduces prostate size and relieves symptoms, but can lower sex drive when first starting on it.

Makes it easier to urinate.

Flomax (tamsulosin) is a good treatment for an enlarged prostate if medical treatment is needed, but it can reduce your sex drive and takes time to kick in.

3.4/ 5 average rating with 85 reviewsforFlomax
  • Avodart (dutasteride) improves prostate symptoms to reduce the need for prostate-related surgery.
  • Most side effects go away after your body gets used to Avodart (dutasteride).
  • Avodart (dutasteride) can be used alone or in combination with Flomax (tamsulosin) to further improve symptoms.
  • Flomax (tamsulosin) works just as well as similar medications but with fewer and less severe side effects.
  • Helps make urinating easier.
  • Available in generic.
  • Also available in a combination form with another medication to treat severe symptoms of enlarged prostate.
  • Simple once daily dosing.
  • Pregnant women or women of childbearing age should avoid exposure to Avodart (dutasteride) from sexual intercourse (use a condom) and blood transfusion.
  • You need to take Avodart (dutasteride) for at least 6 months before your prostate gets small enough for symptoms to improve.
  • Avodart (dutasteride) lowers Prostate-Specific Antigen (PSA) levels and can hide symptoms of prostate cancer.
  • Avodart (dutasteride) may affect sperm in men and their ability to father a child.
  • Flomax (tamsulosin) only treats the symptoms of enlarged prostate. It doesn't make the prostate smaller or stop it from getting bigger.
  • Has to be taken at the same time every day.
  • It can take up to one month to see the full effects of Flomax (tamsulosin).
  • Can reduce sex drive.
  • Flomax (tamsulosin) can't be stopped suddenly, so you'll need to talk to your doctor about how to stop taking it safely.
Used for
  • Enlarged prostate (BPH)
  • Improve urine flow due to nerve issues, radiation therapy, and bladder outlet blockage
  • Promote kidney stone passage
Dosage forms
  • Pill
  • Pill
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85 reviews so far
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Side effects
2possible side effects
  • Erectile dysfunction
  • Decreased libido
See more detailed side effects
15possible side effects
  • Headache
  • Dizziness
  • Runny nose/ nasal congestion
  • Infection
  • Weakness
  • Abnormal ejaculation
  • Back pain
  • Sore Throat
  • Diarrhea
  • Chest pain
  • Drowsiness
  • Cough increased
  • Nausea
  • Insomnia
  • Sinus infection
See more detailed side effects
Risks and risk factors
  • Prostate cancer
    • Men age 55 or older
  • Other diseases of the male urinary tract system and reproductive organs
  • Pregnancy risk and fetal harm
    • Women of childbearing age
    • Breastfeeding
  • Sexual problems
    • Men who are older
    • Taking medicines that cause sexual side effects
    • Medical conditions that cause sexual side effects
  • Blood donation
  • Prostate-specific antigen (PSA) levels
    • Avodart (dutasteride) use for 3 months or longer
See more detailed risks and warnings
  • Low blood pressure
    • Taking medications for high blood pressure
  • Rash
    • History of "sulfa" allergies
  • Floppy iris syndrome
    • Cataract or glaucoma surgery
  • Heat stroke
    • Alcohol use
    • Heavy exercise
    • Hot weather
  • Sexual problems and prolonged erections
  • Drug interactions
See more detailed risks and warnings