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Medication guide

Dutasteride

The referenced approved indication is enlarged prostate. Hair-loss use is off-label and needs prescriber assessment.

Check the name, strength and form on your own prescription or package.

Brand
Avodart
Form
0.5 mg oral capsule
Guidance checked
2026-09-08

About this medication

  • Avodart (dutasteride) helps shrink an enlarged prostate gland in men. It is used alone or together with another medicine to ease urinary symptoms caused by an enlarged prostate, such as a weak stream, frequent urination, or trouble starting to urinate.

The referenced approved indication is enlarged prostate. Hair-loss use is off-label and needs prescriber assessment.

How to use it

  • Swallow the capsule whole with water. Do not chew, break, or open it.
  • You can take this medicine with or without food.
  • Take it at about the same time every day.
  • Do not touch a leaking or broken capsule with bare skin. If you do, wash the area right away with soap and water.

If you miss a dose

  • If you forget a dose, just take your next dose at its regular time. Do not take an extra capsule to make up for the one you missed.

Swallow whole; do not open or chew. Hair-loss dosing cannot be inferred from this prostate monograph.

Pregnancy and breastfeeding

  • This medicine must never be used by women, including during pregnancy or breastfeeding.
  • Men taking this medicine should not donate blood until at least six months after their last dose, so this medicine is not accidentally given to a pregnant woman through a blood transfusion.

Must not be used during pregnancy; avoid contact with leaking capsules.

Before you use it

  • Avodart is only for men. Women and children should never take it.
  • Tell your healthcare professional if you have liver problems.
  • Tell your doctor if you have ever had prostate cancer or another urinary problem, since you should be checked for prostate cancer before starting this medicine.

Important warnings

  • Avodart can pass through skin. If a woman who is pregnant or could become pregnant touches a leaking capsule, it could harm a baby boy in the womb.
  • This medicine may slightly raise the chance of a more serious type of prostate cancer. Your doctor will watch for this with regular checkups.
  • Breast changes such as lumps, swelling, or fluid from the nipple have happened in men taking this medicine. Tell your doctor right away if you notice these changes.
  • Heart failure, when the heart does not pump as well as it should, has happened more often in men taking this medicine together with another prostate medicine called tamsulosin. Tell your doctor if you have swelling in your legs, sudden weight gain, or trouble breathing.

Not for women or children under the referenced label. Keep damaged capsules away from anyone who could be pregnant.

Possible side effects

  • Trouble getting or keeping an erection.
  • Less interest in sex.
  • Changes in ejaculation, such as less semen than usual.
  • Breast swelling or tenderness.
  • Feeling dizzy, especially if you also take tamsulosin.

Reduced libido, erection and ejaculation changes.

When to get help

When to get emergency help

  • Signs of a serious allergic reaction: sudden wheezing or a tight chest, swelling of your face, lips, or eyelids, or a lumpy skin rash or hives anywhere on your body.
  • Severe pain or swelling in a testicle.

When to contact a healthcare professional

  • Any new lump, swelling, or fluid coming from a nipple.
  • Feelings of sadness or depression that are new or getting worse.
  • Swelling in your legs, sudden weight gain, or new shortness of breath.
  • Hair loss on your body or unusual hair growth in new places.

Report breast changes or persistent sexual symptoms; disclose use before PSA testing.

Other medicines and products

  • Tell your doctor or another healthcare professional about all medicines you take, including ones for high blood pressure (like verapamil or diltiazem), HIV (like ritonavir), fungal infections (like ketoconazole), certain infections (like ciprofloxacin), heartburn (like cimetidine), and herbal products like St. John's Wort or milk thistle. These can change how much of this medicine is in your body.
  • Do not eat grapefruit or drink grapefruit juice while taking this medicine, since it can raise the amount of medicine in your blood.
  • You can take this medicine with or without food.

Strong metabolic inhibitors can increase exposure.

Missed doses, storage and accidental exposure

  • Store the capsules at room temperature, away from heat and moisture.
  • Keep this medicine out of the sight and reach of children.
  • Return any cracked, leaking, or unused capsules to the Care365 care team for safe disposal.

Follow your own product’s missed-dose instructions. If you are unsure, ask the Care365 clinical team before taking an extra dose. Contraceptives, injections and modified-release medicines may need a specific plan.

Keep the original packaging and follow its storage, expiry and disposal instructions. Keep medicines away from children and pets. Ask about refrigeration, after-opening limits and safe sharps disposal when relevant.

For suspected overdose or accidental swallowing, contact poison control or urgent medical care promptly. Call emergency services for breathing difficulty, collapse or a seizure.

Key points to remember

  • Do not share this medicine with anyone else.
  • This medicine can lower a blood test called PSA that is used to check for prostate cancer, so always tell any doctor ordering this test that you take dutasteride.
  • It may take up to six months to know if this medicine is working for you.
  • Keep taking this medicine exactly as your doctor or another healthcare professional tells you, and go to all your follow-up appointments.

These practical points come from the Pharmasist patient handout for the same product monograph cited by this guide.

References and product information

Sources checked .

Sources checked 2026-09-08. Safety sections are highlights; consult the full product information for complete warnings and instructions.

Check the Canadian Drug Product Database by product name or DIN for current product information.

This is a plain-language guide, not the complete monograph. Match the name, strength and form on your package before using product-specific directions.

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