2 known interactions • 0 major • 1 moderate • 1 minor
Always disclose all medications to your healthcare providers — prescription medicines, OTC medications, vitamins, and herbal supplements. This list may not include every possible interaction. Use our Medicine Interaction Checker to screen your complete medication list.
Potentially life-threatening or causing permanent damage. Avoid combination.
May worsen condition or require dose adjustment. Monitor closely.
Usually limited clinical effect. Manage with routine monitoring.
PSA testing (laboratory interaction)
Finasteride reduces PSA by approximately 50% after 6 months. This must be considered when interpreting PSA for prostate cancer screening.
Management: Double PSA values in men on finasteride to compare with normal ranges, or use baseline pre-treatment PSA.
No significant pharmacokinetic medicine interactions
Finasteride has minimal medicine-medicine interactions as it is primarily metabolized by CYP3A4 to inactive metabolites and is not a significant CYP inhibitor/inducer.
Always ask your pharmacist about potential interactions with food, alcohol, and supplements specific to Finasteride. Some medicines have significant interactions with grapefruit juice, high-fat meals, dairy products, or vitamin K-rich foods.