ive been taking propecia ed for the past 2, 3 years. It works after at least 6 months of continual popping of 1 tab ed and full effect will achieve by end of 2nd year. tat means how much u gain hair during the 2 year period is how much u gona achieve no matter how long u take. Discontinuation for more than 2 weeks will bring u back to square 1.