Finasteride is a once-daily pill taken at the same time each day, with or without food. The 1 mg dose treats male pattern hair loss, while the 5 mg dose treats an enlarged prostate. Most people searching for how to use it are starting it for hair loss, so here’s what you need to know to take it correctly and set realistic expectations.
How Finasteride Works
Your body converts testosterone into a more potent hormone called DHT, which shrinks hair follicles over time in men genetically prone to hair loss. Finasteride blocks the specific enzyme responsible for that conversion. The result is a significant drop in DHT levels, which slows follicle shrinkage and, in many cases, allows weakened follicles to recover and produce thicker hair again.
Daily Dose and Timing
For hair loss, the standard dose is 1 mg once a day. You can take it in the morning or at night, and it doesn’t matter whether you’ve eaten. What does matter is consistency. Pick a time that fits your routine and stick with it. Many people pair it with another daily habit, like brushing their teeth, to avoid forgetting.
If you miss a dose, just take your next one at the usual time. Don’t double up to make up for it. Missing a single day won’t undo your progress, but regularly skipping doses reduces the drug’s ability to keep DHT levels suppressed.
Swallow the tablet whole. Do not crush, split, or chew it. The tablet has a protective coating that matters for safety reasons covered below.
When to Expect Results
Finasteride is not fast. The typical timeline looks like this:
- Months 1 to 3: Shedding slows or stops. You probably won’t see visible changes yet.
- Months 3 to 6: Early regrowth begins in some people, though it may be subtle.
- Months 6 to 12: More noticeable improvement in hair density and thickness.
Some people don’t see visible results within the first year. That doesn’t mean the drug isn’t working. A long-term study found that continued use eventually produced visible improvement even in slower responders. The majority of regrowth happens within the first two years of treatment.
In a five-year clinical trial involving over 1,500 men, those taking finasteride 1 mg daily showed durable improvements in scalp hair throughout the study period. Men on placebo, by contrast, experienced progressive hair loss over the same timeframe. So finasteride both grows hair and prevents further loss, but the prevention effect is often the more reliable one.
What Happens If You Stop
Finasteride only works while you take it. Once you stop, DHT levels rise back to their previous level, and the hair follicles that were being protected begin to miniaturize again. Hair loss typically returns to its pre-treatment trajectory within 9 to 12 months after stopping. Any hair you regrew during treatment will gradually thin and fall out over that period. This is why most prescribers frame finasteride as a long-term commitment.
Side Effects and Their Frequency
Sexual side effects are the most discussed concern, but clinical data puts the actual rates lower than many online forums suggest. Across studies, sexual side effects occur in roughly 2% to 4% of men. Erectile difficulties are the most commonly reported, followed by changes in ejaculation and reduced sex drive.
A long-term study found that these side effects resolved in all men who stopped the medication because of them, and they also faded in most men who continued taking it. By the fifth year of treatment, the incidence of each sexual side effect had dropped to 0.3% or less.
The FDA has also flagged psychological side effects in a smaller number of reports, including anxiety, depression, difficulty concentrating, and insomnia. These appear in the labeling for both oral and topical finasteride products. If you notice mood changes after starting the medication, that’s worth discussing with your prescriber rather than dismissing.
Handling Precautions
Finasteride poses a specific risk to pregnant women. If a woman carrying a male fetus absorbs the drug, either by swallowing it or through skin contact, it can cause abnormalities in the baby’s sex organs. The tablet’s coating prevents skin absorption during normal handling, but that protection disappears if the tablet is crushed or broken.
If you live with a partner who is or could become pregnant, store your medication where it won’t be handled by anyone else, and never break or crush tablets. This also applies to topical finasteride formulations, which carry an additional risk of transfer through skin-to-skin contact after application. The FDA flagged this concern specifically for compounded topical products in an April 2025 alert.
Combining With Other Treatments
Finasteride works from the inside by lowering DHT. Minoxidil, the other widely used hair loss treatment, works from the outside by increasing blood flow to hair follicles. Because they target different mechanisms, many people use both. Finasteride handles the hormonal cause of thinning while minoxidil stimulates growth at the follicle level. Your prescriber can help you decide whether combining treatments makes sense based on how much thinning you have and where it’s concentrated.
Some people also use ketoconazole shampoo two to three times per week as a mild anti-androgen applied to the scalp. It’s not a replacement for finasteride, but it can complement it as part of a broader routine.
Practical Tips for Staying Consistent
The biggest obstacle with finasteride isn’t side effects for most people. It’s patience. Three to six months of taking a daily pill with no visible change tests anyone’s commitment. A few strategies help. First, take a clear set of photos before you start, in consistent lighting, from the same angles. Progress is hard to notice day to day but obvious in side-by-side photos taken months apart. Second, set a daily reminder on your phone until the habit is automatic. Third, resist the urge to evaluate results before the six-month mark. Judging too early leads to unnecessary discouragement and premature discontinuation.