What is the best dosage of Rogaine? Once or twice daily?

Use of Rogaine is suggested from 1-2 times a day. It is fine if you’re applying it once a day but even if you apply 2 nd time it won’t lose any effect and might result in an improvement. That also vary from you skin type. So using Rogaine twice a day is considered to be more effective the once a day.

No studies show whether once or twice daily is more effective but if you can be compliant would try twice daily.  As far as stopping rogaine there is no "withdrawal" but hair loss that was taking place before utilizing Rogaine will continue once you stop Rogaine as there is no lasting effect from Rogaine.