Why is this doctor saying Propecia only works for 3 years?

[JohnC43]

http://www.baldingblog.com/2005/08/12/propecia-benefit/

Q: I have a question for you … on merck site it says hair mass can thicken up to two yrs… but I was told it can thicken up to three yrs… is that true??? and when is the best time to take propecia am or pm??? please let me know your answer… thanks

A: I would not doubt what Merck says, but these are generalizations about the length of time the drug will give thickness- it can vary with each patient from one to three years

Are any of these quotes true? What exactly do they mean "hair mass can thickn up to 2 years"? Does that mean it only gains for 2 yrs and then stops or it only works for 2 years and then goes back to receding? I am lost. I thought there was just a rumor that in various cases it dwindles after 5 years and that most upkept effectiveness well past that.

 

[Dalton]

Looks to me he means that you will gain for 3 years and then hold steady what you have after that