Finasteride is a prescription drug sold in Canada under two brand names, "Propecia" and "Proscar." Propecia (1 mg tablets) is used for the treatment of male pattern hair loss, while Proscar (5 mg tablets) is used in the treatment and control of benign prostatic hyperplasia (BPH), which is a non-cancerous enlarged prostate. Finasteride is for use in men only.
Male breast cancer has been reported in a small number of patients worldwide with both the 1 mg and 5 mg formulations of finasteride. Most of the reports have been in association with the 5mg formulation. Based on the currently available evidence, it is not known with certainty whether finasteride can cause breast cancer, nor can this possibility be ruled out at this point in time.
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