Ingredient

Finasteride

Finasteride is a medication used for the treatment of androgenetic alopecia and benign prostatic hyperplasia.

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MFDS ingredient code M089174

What does it do?

Finasteride belongs to the 5-alpha reductase inhibitor class and is primarily used for the treatment of androgenetic alopecia and benign prostatic hyperplasia. This ingredient helps slow the progression of hair loss and reduce the size of the prostate by affecting male hormone metabolism.

Finasteride prevents the conversion of testosterone into its more potent form, dihydrotestosterone (DHT), in the body. DHT causes hair follicles to shrink, leading to hair loss and the enlargement of prostate tissue. By inhibiting DHT, it slows down the progression of hair loss and decreases prostate size.

Commonly used for

Approved uses differ by product. Check each product's information for its actual use.

Good to know

Unlike other hair loss treatments, finasteride has the unique characteristic of directly regulating hormonal metabolic pathways. Additionally, it selectively inhibits specific types of 5-alpha reductase to minimize side effects.

Medicines containing this ingredient

Even with the same ingredient, strength, dosage form and how it is taken can differ.

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Even with the same ingredient, dosage and approved uses can differ by strength, dosage form and combined ingredients. Check each product's information before taking it.

Questions about this ingredient

  • QIs it true that prostate medication and hair loss medication contain the same ingredients?

    Yes, finasteride is used for both the treatment of male pattern baldness and benign prostatic hyperplasia. In both cases, it works by inhibiting DHT production through the same mechanism. However, the approved indications and dosages may differ by product, so please do not use one product for another purpose at your discretion, and if you have received both, consult with the prescribing doctor regarding ingredient overlap.

    Answers 1 · 2026.09.14

  • QHow does finasteride work for hair loss?

    Finasteride is a 5-alpha reductase inhibitor that prevents testosterone from converting to dihydrotestosterone (DHT). DHT causes hair follicles to shrink, leading to hair loss, and this principle is to inhibit it, thereby slowing down the progression of hair loss. The effectiveness may vary among individuals.

    Answers 1 · 2026.09.14

For anything that needs medical judgment, consult a doctor or pharmacist.

SourceKorea Ministry of Food and Drug Safety (Drug Safety Korea)

This drug information is based on data provided by the Korea Ministry of Food and Drug Safety.
Consult a doctor or pharmacist for accurate dosage, administration, and usage instructions.