start twice a day, morning and 4-6 hours later then if you feel necessary move to 3x a day morning +4hrs +8hrs.

i would also advise trying a half that amount of ephedrine to start and increase as you feel comfortable. As 25mg of ephedrine can cause alot of side effects to some people and make them feel uncomfortable.

i like to go 3 weeks on, and 2-3 weeks off

try not to take a dose within 6 hours of bedtime if you having sleeping trouble