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Finasteride

Drug Class: Commonly Known As: Category:
5 Alpha Reductase Inhibitor Proscar

Finasteride - Side Effects, Precautions, and Contraindications

What side effects can Finasteride cause?

  • ​Unable to get or keep an erection firm enough to have sexual intercourse
  • Decreased libido (sex drive); less desire to have sex
  • Difficulty with ejaculation

These side effects may disappear after a while if you continue to take the medication. If not, they usually go away after stopping the medication. Discuss with your doctor if you are unsure or these side effects become bothersome to you.

The symptoms of a drug allergy include one or more of the following:

  • Swollen face/eyes/lips/tongue
  • Difficulty in breathing
  • Itchy skin rashes over your whole body

Changes in your breast tissue such as lumps, pain, enlargement or nipple discharge.

Pain in your testicle

If you experience any of these symptoms, you should stop your medication and see your healthcare professional immediately.

Before taking Finasteride, what precautions must I follow?

  • ​Use a condom during sexual intercourse as your semen could contain the medication. If your partner is or may be pregnant, you must avoid exposing her to your semen as it may affect the normal development of the baby’s sex organs.
  • Avoid donating blood during treatment or for 1 month after you stopped the treatment as there may be a risk that your blood may be given to a pregnant female transfusion recipient.

Inform your healthcare professional if:

  • You are allergic to this medication or any of the other ingredients of this medication
  • You have heart or liver problem
  • You are taking this medication as it may affect prostate specific antigen (PSA), a lab test to monitor the effectiveness of the medication as well as the condition.

What food or medicine must I avoid when I take Finasteride?

​Inform your healthcare professional if you are taking or intend to take any other medication, supplements, traditional medications or herbal remedies.

Finasteride - Additional Information

  • Updated on Monday, September 30, 2019
  • Article contributed by PSS National Medication Information Workgroup

    The information provided is not intended as medical advice. Terms of use. Information provided by SingHealth

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