Cassin said:
regarding what? Continuous usage or after stopping it?
Continuous usage, nobody knows.
After stopping it 6 months to a year.
Half true. Good responders get more regrowth and maybe peak further down. But it is known that minoxidil does NOT slow down the balding process like propecia does. It regrows a certain amount of hair, which varies from person, and reaches that number in a certain amount of time. While this number is being reached, follicles continue to be damaged, but that is not noticeable yet because they are being stimulated. Once you reach the peak, and stay on minoxidil, your hair counts will drop just as fast as the placebo group in the propecia trials. Minoxidil will not slow that down. And if you get off minoxidil, you lose the regrowth hair too and end up where you would be had you never been on it.
For those of you who are graphically inclined:
Let Y = number of hairs on your head per square inch.
Let X = months on the drug.
K = some max value that depends on genetics, time and dose. K goes back to zero when you get off.
m = the rate someone is balding, which is genetic
n2 = initial regrowth of propecia, and leaves when you get off
n = the effectiveness of propecia
Let's look at the graph to see how minoxidil works:
For non-male pattern baldness men not on minoxidil, Y = 700.
For non-male pattern baldness men who take minoxidil, Y = 700 + K
For male pattern baldness men who are not on minoxidil, Y = 700 -mX
For male pattern baldness men who are on minoxidil, Y = 700 -mX + K
For male pattern baldness men who are on propecia and minoxidil, & = 700 + (n-m)X + K +n2
NOTE: m is not really a constant, and depends on age, genetics, and how much more hair you currently have than your genes say you should have. When you get off propecia, you lose your recent gains and maintainance within a year. You lose minoxidil gains within a few weeks to a month.
Before anyone accuses me of anything, ask Bryan about this. He posted graphs that back up this simplification, and I'm sure he can read algebra.