Finax 1mg is a medication used to treat male pattern hair loss and symptoms of benign prostatic hyperplasia (BPH) . It contains the active ingredient finasteride, which works by blocking the action of an enzyme called 5-alpha-reductase, which changes testosterone to another hormone that causes the prostate to grow. While finasteride can be effective in treating these conditions, it can also cause side effects. Some common side effects of finasteride include decreased libido, erectile dysfunction, ejaculation disorder, and skin rash. Other less common side effects include decreased fertility, depression, and changes in breast size. Finasteride is not indicated for use in the pediatric population, and safety and efficacy have not been established. If you experience any side effects while taking finasteride, it is important to talk to your doctor or pharmacist.