Finasteride

(Commercial Product) Tablets USP

1 mg

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Product Overview

Finasteride Tablets USP Description1,2,3

Finasteride is a 5-alpha reductase inhibitor that has demonstrated benefit in patients with symptomatic benign prostatic hyperplasia, a condition commonly affecting men over the age of 50. Finasteride has also been shown to be beneficial in the treatment of androgenetic alopecia (male pattern hair loss).

References

  1. Finasteride (Proscar) package insert www.accessdata.fda.gov/drugsatfda_docs/label/2010/020180s037lbl.pdf
  2. Finasteride (Propecia) www.accessdata.fda.gov/drugsatfda_docs/label/2012/020788s020s021s023lbl.pdf
  3. Clinical Pharmacology finasteride clinical monograph 2025 https://www.clinicalkey.com/pharmacology/

Mechanism of Action1,2,3

Finasteride is an analog of testosterone that acts as a competitive, specific inhibitor of type II 5-alpha-reductase, an intracellular enzyme that converts testosterone to the potent androgen 5-alpha-dihydrotestosterone. The type II 5-alpha-reductase isozyme is primarily found in prostate, seminal vesicles, epididymides, and hair follicles, as well as liver. Dihydrotestosterone has been shown to increase prostate growth and can lead to hair thinning. Finasteride has been shown to shrink the prostate to improve urinary flow and in scalp lowers dihydrotestosterone to slow hair loss and promote regrowth.

Adverse Reactions1,2,3

  • Decreased libido
  • Erectile dysfunction
  • Ejaculatory disorders (e.g., reduced volume)
  • Breast tenderness or enlargement
  • Gynecomastia

Contraindications1,2,3

  • Contraindicated in women who are or may become pregnant due to risk of teratogenicity (can cause abnormalities in the external genitalia of male fetuses).
  • Hypersensitivity to finasteride or any component of the tablet.

Precautions1,2,3

  • Finasteride lowers serum PSA levels by ~50% after 6 months, which can mask early detection of prostate cancer.
  • Use cautiously in patients with hepatic dysfunction. The drug is metabolized extensively in the liver.
  • Store at controlled room temperature (20°C to 25°C / 68°F to 77°F)
  • Protect from moisture and light
  • Keep in a tightly closed container
  1. Finasteride (Proscar) package insert www.accessdata.fda.gov/drugsatfda_docs/label/2010/020180s037lbl.pdf
  2. Finasteride (Propecia) www.accessdata.fda.gov/drugsatfda_docs/label/2012/020788s020s021s023lbl.pdf
  3. Clinical Pharmacology finasteride clinical monograph 2025 https://www.clinicalkey.com/pharmacology/
This information is for educational purposes only.
WP Pharma Labs distributes certain FDA-approved commercial products that are manufactured by third-party pharmaceutical companies. These products are not compounded or manufactured by WP Pharma Labs. Product availability at the time of dispensing may vary due to supply chain conditions.
This information is a summary. It may not cover all possible drug information about this product. For complete product information, refer to the manufacturer’s prescribing information and labeling. Call your doctor for medical advice and/or about side effects. You may report side effects to the FDA at 1-800-FDA-1088. A WP Pharma Labs pharmacist will be happy to answer any questions. For consultation, please call 1-800-441-0048.

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