I take 20mg of Ritalin at 9 in the morning and again at 1:30 in the afternoon. I am told the drug is effective for 4-5 hours. Does that mean the Ritalin I took during the day has no benefit later (in the evening)?

Thanks

So far Ritalin has no effect. Hoping a higher dose works.
Wasted 5 months trying Strattera. Nice side effects and no effect either..