Finastox 1 Tablet contains Finasteride (1mg), primarily used to treat male pattern hair loss and benign prostatic hyperplasia (BPH). Finastox 1 Tablets. Benign Prostatic Hyperplasia (BPH): Finastox 1 Tablet is also used to treat symptoms of an enlarged prostate such as frequent urination, difficulty starting urination, and weak urine flow.