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What is Proscar?

Proscar, also known by its generic name finasteride, is a medication used to shrink an enlarged prostate in adult men. This drug is used in a treatment plan with other medications to reduce symptoms of benign prostatic hyperplasia (BPH). BPH is a condition that affects older men and it can cause uncomfortable urinary symptoms as well as bladder, urinary tract or kidney problems.

How does Proscar work?

Finasteride blocks the conversion of testosterone and the hormone dihydrotestosterone. Dihydrotestosterone is partly responsible for making the prostate enlarge, so this drug reduces the amount of this hormone, which prevents the hormone from enlarging.

Always read the medication information and instructions before using this medication.
Always follow your doctor’s directions.

  • This medication is taken once daily, most often in a 5mg tablet.
  • Take Proscar before or after a meal.
  • Take your drug at the same time every day.
  • It may take 6-12 months to notice a benefit.


Make sure to tell your doctor:

  • If you have a medical history of liver disease, prostate cancer, infections, or urinary problems.
  • Finasteride should not be used in children.
  • If you have any allergic reactions to any medicine.

This drug can be absorbed through the skin, so do not handle the broken tablet if you are pregnant or planning to become pregnant. Exposing an infant male to this drug can result in abnormalities. Tell your doctor if you are exposed to it if you are pregnant or breastfeeding.

Side effects of Proscar

Side effects of Proscar include but are not limited to:

  • Decreased sexual ability/desire
  • An increased amount of semen released during sex
  • May increase hair growth

Tell your doctor right away if you experience:

  • Lumps in the breast
  • Nipple discharge
  • Breast enlargement, pain, or tenderness
  • Pain in the testicles
  • Inability to urinate


How to store this medication?

Store this medication at room temperature below 86 degrees Fahrenheit. Keep Proscar away from light and moisture in a tightly closed container. Do not store it in the bathroom and keep it away from children and pets. Do not flush medications down the toilet.

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