Finasteride
Proscar (finasteride 5mg) is a prescription medication primarily used to treat benign prostatic hyperplasia (BPH), a condition where the prostate gland becomes enlarged in men. It works by inhibiting the enzyme 5-alpha reductase, which reduces levels of dihydrotestosterone (DHT), a hormone that contributes to prostate growth. This medication is for use in men only and is available by prescription.
Proscar is a prescription medication for men that treats enlarged prostate by reducing hormone levels that cause prostate growth.
Key facts at a glance
- RxNorm
- 196476
- Generic
- Proscar
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Proscar is FDA-approved for the treatment of benign prostatic hyperplasia (BPH) to improve symptoms, reduce the risk of acute urinary retention, and decrease the need for surgery. It may also be prescribed off-label for other conditions as determined by a healthcare provider.
Proscar belongs to a class of drugs called 5-alpha reductase inhibitors. It works by blocking the conversion of testosterone to dihydrotestosterone (DHT), a more potent androgen hormone that drives prostate tissue growth. By lowering DHT levels, it can shrink the prostate gland over time.
Proscar is for use in men only. Women, especially those who are or may become pregnant, should avoid handling crushed or broken tablets due to risk of birth defects. Common side effects may include decreased libido, erectile dysfunction, and ejaculation disorders. Regular follow-up with a healthcare provider is important while taking this medication. Do not donate blood while taking Proscar to avoid potential harm to pregnant recipients.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 9, 2026. · Read our editorial policy