Medically reviewed by Jessica Swirble, PharmD
Last updated on March 26, 2025
Drug Information | Side Effects | Use & Dosage | Request an Online Prescription
Finasteride is a medication classified as a 5-alpha-reductase inhibitor. It is primarily used to treat benign prostatic hyperplasia (BPH) and male pattern baldness (androgenetic alopecia).
Finasteride is used to treat conditions such as:
It may also be prescribed for other medical conditions as determined by your healthcare provider.
Finasteride works by inhibiting the enzyme 5-alpha-reductase, which converts testosterone into dihydrotestosterone (DHT). DHT is involved in the development of BPH and male pattern baldness. By reducing DHT levels, finasteride helps shrink the prostate gland in BPH and promotes hair regrowth in male pattern baldness.
Finasteride is usually taken orally as a tablet, with or without food, as directed by your healthcare provider. The dosage and duration of treatment depend on the condition being treated and your response to the medication.
Follow the prescribed dosage and schedule strictly. Do not stop taking finasteride suddenly without consulting your healthcare provider, as it may affect the effectiveness of the treatment.
The time it takes to see noticeable results with finasteride can vary. Some men may experience improvements in symptoms of BPH, such as reduced urinary urgency and frequency, within a few weeks to months of starting treatment. For male pattern baldness, visible hair regrowth may take several months to a year of consistent use.
Continue taking finasteride as prescribed even if you do not see immediate results. Talk to your healthcare provider if you have any concerns or questions about your treatment progress.
While finasteride is primarily used for BPH and male pattern baldness, healthcare providers may sometimes prescribe it off-label for other conditions.
Discuss any alternative uses of finasteride with your healthcare provider.
Finasteride is available in the following dosage forms:
Generic versions of finasteride are available under various brand names.
Finasteride is a prescription medication. You will need a valid prescription from a licensed healthcare provider to obtain this medication.
The use of finasteride can lead to various side effects in some individuals.
Common mild side effects of finasteride use include:
More severe side effects of finasteride use can include:
Finasteride may increase your risk of developing prostate cancer or breast cancer. Discuss these risks with your healthcare provider before starting treatment with finasteride.
If you experience any severe side effects while taking finasteride, contact your healthcare provider immediately.
Inform your healthcare provider about any existing medical conditions, allergies, or other medications you are taking before starting treatment with finasteride. This includes prescription drugs, over-the-counter medications, and dietary supplements, as they may interact with finasteride.
Tell your provider if you are taking these medications or supplements:
Mention medical conditions such as:
If you are pregnant, planning to become pregnant, or breastfeeding, avoid handling crushed or broken finasteride tablets due to the risk of absorption through the skin, which may harm the unborn baby or nursing infant.
Take finasteride exactly as prescribed by your healthcare provider. Do not increase or decrease the dosage without consulting them.
Finasteride may take several months to show noticeable effects, especially for male pattern baldness. Continuously taking the medication as directed is important for achieving and maintaining results.
In case of a finasteride overdose, seek medical attention immediately. Symptoms of overdose may include dizziness, seizures, lightheadedness, fainting, or trouble breathing. If you suspect an overdose, contact the poison control helpline at 1-800-222-1222 or call emergency services.
Finasteride is available in various strengths, including:
The typical starting dose of finasteride for male pattern hair loss (androgenetic alopecia) and benign prostatic hyperplasia (BPH) can vary depending on factors such as the specific condition being treated, your age, other medical conditions, and how you respond to the medication. It's crucial to follow your healthcare provider's instructions regarding dosage and administration carefully.
For most adults with male pattern hair loss, the typical starting dose of finasteride may be:
For BPH, the typical starting dose of finasteride may also be:
It's important to note that finasteride for male pattern hair loss is often prescribed at a lower dose (1 mg) compared to its use for BPH (5 mg).
However, your healthcare provider may recommend a different starting dose or adjustment based on your individual circumstances.
Finasteride can be taken with or without food, but it's important to take it consistently at the same time each day.
Your healthcare provider will monitor your response to finasteride and may adjust the dose as needed. It's important not to exceed the recommended dose or make changes to your dosage without consulting your healthcare provider.
If you have any questions about your dosage or how to take finasteride, contact your healthcare provider or pharmacist. If you want to talk to a provider right away, consider booking an online doctor appointment on Sesame to discuss your concerns.
If you miss a dose of finasteride, take it as soon as you remember. If it's almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one.
Continue taking finasteride as prescribed by your healthcare provider, even if you start feeling better. Abruptly stopping finasteride can lead to the worsening of your condition. Follow your provider's instructions regarding the duration of treatment.
Store finasteride according to the instructions provided by your healthcare provider or pharmacist. It should be kept at room temperature, away from moisture, heat, and light. Ensure the container is tightly closed and keep the medication out of the reach of children.