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How Long Before Finasteride Starts Working?

How Long Before Finasteride Starts Working?

Finasteride, which blocks the conversion of testosterone to DHT, is one of the most popular hair loss drugs on the market. It’s also one of the most effective, with a proven record of helping men maintain their hair and even grow back some of the hair they’ve previously lost.

Like most medicines, it takes time to see results from finasteride. Depending on the severity of your hair loss, it might take several months before you notice any improvement in the thickness of your hair.

Finasteride Starts Blocking DHT Immediately

As a drug, finasteride actually begins working immediately, meaning it will have an effect on your body as soon as you metabolize the first pill.

This means that you will have lower DHT levels as soon as the first dose of finasteride gets into your system. On average, finasteride reduces the amount of DHT in your body by approximately 70%, which is enough to stop male pattern hair loss in its tracks.

Even though finasteride has a short half-life, it accumulates in your system. This means that a daily dose (usually 1mg, although it can vary) is enough to keep DHT production low, meaning it’s constantly working to protect your hair.

It Takes Three to Four Months to See Results

Assuming you follow the instructions and take finasteride every day, you’ll generally start to see results by month three or four. However, it usually takes six to nine months to see the full effects of finasteride, since hair follicles require plenty of time to produce new hairs.

It’s important to remember that finasteride doesn’t always cause you to regrow hairs that you’ve previously lost. Most people who take finasteride do so to stop further hair loss, rather than as a way to regrow hair.

This means that you might not notice any improvement in your hair from finasteride, even though it’s constantly working by preventing any extra hair from falling out.

It’s also important to remember that your hair will still fall out as part of its natural growth cycle (in order to be replaced by newer hairs), meaning you’ll still notice some stray hairs inside the shower, on your comb or in your hands even after you start using finasteride.

It Takes About One Year to See "Final" Results

Most of the time, you’ll see the "final" results from finasteride after about a year of using the drug on a daily basis. If you forget to take the pill some days or skip weeks or months of treatment, it can prevent finasteride from working as effectively as it normally would.

The key thing to keep in mind is that you shouldn’t stop taking finasteride just because it doesn’t produce any visible improvement in your hairline or hair thickness. If you stop taking finasteride, your DHT levels will go back to their natural amount and you could start to lose hair again.

When used properly, finasteride is highly effective at preventing hair loss. Just remember to stay patient while it takes effect since your hair follicles need several months to move into the growth phase and start producing new hair.

This article was reviewed by Ho Anh, MD.

Important Safety information


Finasteride is for use by MEN ONLY and should NOT be used by women or children.

Read this Patient Information before you start taking Finasteride and each time you get a refill. There may be new information. This information does not take the place of talking with your healthcare provider about your medical condition or treatment.

What is Finasteride?

Finasteride is a prescription medicine used for the treatment of male pattern hair loss (androgenetic alopecia).

It is not known if Finasteride works for a receding hairline on either side of and above your forehead (temporal area).

Finasteride is not for use by women and children.

Who should not take Finasteride?

Do not take Finasteride if you:

  • are pregnant or may become pregnant. Finasteride may harm your unborn baby.
    • Finasteride tablets are coated and will prevent contact with the medicine during handling, as long as the tablets are not broken or crushed. Females who are pregnant or who may become pregnant should not come in contact with broken or crushed Finasteride tablets.
    • If a pregnant woman comes in contact with crushed or broken Finasteride tablets, wash the contact area right away with soap and water. If a woman who is pregnant comes into contact with the active ingredient in Finasteride, a healthcare provider should be consulted. If a woman who is pregnant with a male baby swallows or comes in contact with the medicine in Finasteride, the male baby may be born with sex organs that are not normal.
  • are allergic to any of the ingredients in Finasteride. See the end of this leaflet for a complete list of ingredients in Finasteride.

    What should I tell my healthcare provider before taking Finasteride? Before taking Finasteride, tell your healthcare provider if you:

  • have any other medical conditions, including problems with your prostate or liver

    Tell your healthcare provider about all the medicines you take, including prescription and nonprescription medicines, vitamins, and herbal supplements.

    Know the medicines you take. Keep a list of them to show your healthcare provider and pharmacist when you get a new medicine.

    How should I take Finasteride?

  • Take Finasteride exactly as your healthcare provider tells you to take it.
  • You may take Finasteride with or without food.
  • If you forget to take Finasteride, do not take an extra tablet. Just take the next tablet as usual.

    Finasteride will not work faster or better if you take it more than once a day.

    What are the possible side effects of Finasteride?

  • decrease in your blood Prostate Specific Antigen (PSA) levels. Finasteride can affect a blood test called PSA (Prostate-Specific Antigen) for the screening of prostate cancer. If you have a PSA test done you should tell your healthcare provider that you are taking Finasteride because Finasteride decreases PSA levels. Changes in PSA levels will need to be evaluated by your healthcare provider. Any increase in follow-up PSA levels from their lowest point may signal the presence of prostate cancer and should be evaluated, even if the test results are still within the normal range for men not taking Finasteride. You should also tell your healthcare provider if you have not been taking Finasteride as prescribed because this may affect the PSA test results. For more information, talk to your healthcare provider.

  • There may be an increased risk of a more serious form of prostate cancer in men taking finasteride at 5 times the dose of Finasteride.

    The most common side effects of Finasteride include:

  • decrease in sex drive
  • trouble getting or keeping an erection
  • a decrease in the amount of semen

    The following have been reported in general use with Finasteride:

  • breast tenderness and enlargement. Tell your healthcare provider about any changes in your breasts such as lumps, pain or nipple discharge.
  • depression;
  • decrease in sex drive that continued after stopping the medication;
  • allergic reactions including rash, itching, hives and swelling of the lips, tongue, throat, and face;
  • problems with ejaculation that continued after stopping medication;
  • testicular pain;
  • difficulty in achieving an erection that continued after stopping the medication;
  • male infertility and/or poor quality of semen.
  • in rare cases, male breast cancer.

    Tell your healthcare provider if you have any side effect that bothers you or that does not go away.

    These are not all the possible side effects of Finasteride. For more information, ask your healthcare provider or pharmacist. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA1088.

    How should I store Finasteride?

  • Store Finasteride at room temperature between 59˚F to 86˚F (15˚C to 30˚C).
  • Keep Finasteride in a closed container and keep Finasteride tablets dry (protect from moisture).

    Keep Finasteride and all medicines out of the reach of children.

    General information about the safe and effective use of Finasteride.

    Medicines are sometimes prescribed for purposes other than those listed in this Patient Information. Do not use Finasteride for a condition for which it was not prescribed. Do not give Finasteride to other people, even if they have the same symptoms you have. It may harm them.