For my patients who want to take a reduced dose of Finasteride, I generally tell my patients to take either 1/4 of a pill (0.25 mg/day) or one pill (1mg) every four days. Do that for three weeks and then increase it to one pill (1mg) every three days for three weeks, then one pill (1mg) every two days and stay on this. This is my routine for people who have erectile dysfunction.