Finasteride: Uses, Side Effects, and FAQs
Finasteride is an FDA-approved oral treatment for male pattern baldness (androgenetic alopecia)—the most common cause of hair loss in men, affecting a majority of men at some point in their lives.
Sold under brand names like Propecia, it’s one of the most widely prescribed and clinically studied hair loss treatments available, and remains a first-line option for men looking to slow thinning.
This guide explains how Finasteride works, how to take it properly, possible side effects, and who it’s for.
How Finasteride Works
Finasteride works by blocking an enzyme called 5-alpha-reductase, which converts testosterone into DHT (dihydrotestosterone).
DHT is the hormone primarily responsible for male pattern baldness.
It binds to hair follicles, causing them to shrink, produce thinner hairs, and eventually stop growing hair altogether.
By lowering DHT, Finasteride helps protect follicles from this process.
With less DHT reaching your scalp, follicles stay healthier for longer thus slowing hair loss and supporting regrowth, especially at the crown and mid-scalp.1
How to Take Finasteride
Finasteride is taken orally once a day. It’s important to take it consistently to maintain results.
Standard instructions:
- Take one 1 mg tablet per day.
- You can take it with or without food.
- Try to take it at the same time each day.
- Do not take more than one tablet in 24 hours.
If you miss a dose:
- Take it as soon as you remember.
- If it’s almost time for your next dose, skip the missed one.
- Do not double up — taking more won’t speed up results and may increase side effects.
Who Can Take Finasteride
Finasteride is intended for adult men aged 18 and above experiencing male pattern hair loss.
It is not recommended for:
- Women, especially those who are or may become pregnant.
- Children and adolescents under 18 years old.
- Men with a known allergy or hypersensitivity to Finasteride.
- Individuals with a history of certain prostate conditions (consultation required).
As with any medication, consult a healthcare provider before starting Finasteride, especially if you have underlying medical conditions or are taking other medications.
Side Effects of Finasteride
Finasteride is generally well tolerated, but some users may experience side effects.
Common side effects include:
- Decreased libido, difficulty achieving or maintaining an erection, and difficulty ejaculating.
- Breast tenderness or slight enlargement.
- Mood changes such as anxiety, irritability, or low mood (less common).
Most side effects are mild and may improve with continued use or after stopping treatment.2
If any symptoms persist or worsen, consult a healthcare provider.
Medicines You Should Not Use with Finasteride
Finasteride doesn’t have any well-known or major drug interactions.
Still, it’s important to tell your doctor about all other medications or supplements you’re taking before starting treatment.
Avoid using it alongside other hormonal or prostate-related treatments unless specifically recommended by a healthcare professional.
Where can I get Finasteride?
Finasteride is a prescription-only medication, so it can’t be obtained without proper medical oversight.
Through GoRocky, this process works as follows: you complete an online health assessment covering your medical history and relevant symptoms. Note: Prescription treatment is only available to men over the age of 18.
If your assessment meets these criteria, Finasteride is prescribed and shipped directly to you, with follow-up support available from the medical team for questions during treatment.
Finasteride isn’t suitable for everyone.
If you’re experiencing hair loss and want to find out if Finasteride is an option for you, you can complete the assessment here.
Frequently Asked Questions
Most users start noticing visible improvements within 3 to 6 months of consistent Finasteride use, and more significant improvements at 6 to 12 months.3 This gradual timeline reflects the natural hair growth cycle, since existing follicles need time to respond to lower DHT levels before new, thicker hairs become visible. While on Finasteride, you may see less hair fall and may even experience the appearance of fine new hairs in thinning areas. Sticking with daily use during this waiting period is important, since stopping early — even if results aren’t yet visible — can undo the progress that’s building beneath the surface.
Some users may notice a slight drop in sex drive, along with breast tenderness or mild changes in mood. These side effects are uncommon, usually mild, and often go away with continued use or after stopping the medication. Research suggests that only a small percentage of men experience these effects, and for many, they resolve on their own within the first few months of treatment. If side effects do occur and feel bothersome or persistent, it’s worth discussing them with your doctor, since dose adjustments or alternative approaches may help.
No. Finasteride is not recommended for women, especially those who are or may become pregnant, as it may cause serious birth defects in male babies. This risk exists even through skin contact with crushed or broken tablets, so pregnant women should avoid handling them altogether. Finasteride’s mechanism — lowering DHT — also isn’t typically effective for the pattern of hair loss most women experience, which is part of why it isn’t prescribed for this population.
Take one 1 mg tablet of Finasteride once a day, with or without food. Try to take it at the same time daily to keep hormone levels stable, since consistent timing helps maintain steady DHT suppression rather than allowing it to fluctuate. Many users find it helpful to pair the dose with an existing daily habit, like brushing their teeth, to avoid missed days. Skipping doses or taking it irregularly can slow down or limit the results you’re working toward.
Yes. Some users experience temporary shedding in the first few weeks of Finasteride treatment. This is often a sign that older hairs are being shed to make way for new growth, as the hair cycle resets and follicles transition into a healthier growth phase. This shedding phase is usually short-lived, typically resolving within a few weeks to a couple of months. If shedding continues well beyond this window or seems unusually heavy, it’s a good idea to check in with your doctor to rule out other causes.
At GoRocky, we're here to help men take charge of their health — confidently, discreetly, and without judgment.
We provide access to experts who can perform medical consultations that can assess for common issues like erectile dysfunction, while guiding you through real concerns about men's health.
Our goal? A world where men are healthier, happier, and more confident — starting with you. No stress, no shame, just straightforward care that works.
For more information, reach out at [email protected] or call +63 966 952 8623.
[1] McClellan KJ, Markham A. Finasteride: a review of its use in male pattern hair loss. Drugs. 1999;57(1):111-126. doi:10.2165/00003495-199957010-00014.
[2] Finasteride. Drugs.com. Updated June 5, 2024. Accessed May 9, 2025. https://www.drugs.com/finasteride.html.
[3] Barat J. How Long Does it Take Finasteride (Propecia) to Work For Hair Loss? Plus 7 More FAQs. GoodRX. Updated February 16, 2024. Accessed May 9, 2025. https://www.goodrx.com/finasteride/how-long-to-see-results-from-finasteride.