What is finasteride used for?
Finasteride is a prescription medicine that lowers levels of the hormone dihydrotestosterone (DHT) by blocking the enzyme 5-alpha-reductase. It’s used for a few common conditions:
- Benign prostatic hyperplasia (BPH): Finasteride helps shrink an enlarged prostate and can improve urinary symptoms related to BPH and reduce the risk of urinary retention or need for prostate surgery.[1]
- Male pattern hair loss (androgenetic alopecia): Finasteride can slow hair loss and promote hair growth in men with androgen-driven hair thinning.[2]
What doses are used for hair loss vs prostate problems?
The finasteride dose depends on the condition:
- BPH is typically treated with a higher daily dose than hair loss.[1]
- Male pattern hair loss is treated with a lower daily dose.[2]
If you’re comparing products, check the strength on the label and follow the prescriber’s instructions, since the same ingredient at different doses is used for different indications.
How does finasteride work in the body?
Finasteride blocks 5-alpha-reductase, which reduces conversion of testosterone to DHT. Lower DHT is the main reason it helps with prostate enlargement and androgenetic hair loss.[1][2]
How long does it take to work?
For hair loss, results usually take months to show because hair growth cycles are slow. For BPH, symptom improvement also takes time and varies by patient. Your clinician can give expectations based on your diagnosis and dose.[1][2]
What other conditions is finasteride sometimes discussed for?
People may search finasteride for related androgen-dependent conditions, but the key widely used, established uses are BPH and male pattern hair loss. If you’re considering it for an off-label purpose, discuss benefits and risks with a clinician.
What side effects are people most concerned about?
Common concerns include sexual side effects (such as reduced libido or erectile/ejaculatory changes) and mood-related effects. If you experience troubling symptoms, contact the prescriber promptly—don’t stop the medicine without medical advice.[1][2]
Sources:
1. https://www.drugs.com/finasteride.html
2. https://www.drugs.com/monograph/finasteride.html