I have a good genuine supply of Methylphenidate in both slow release (Concerta) and fast release (Ritalin).

Ritalin in high doses can be used to get an effect similar to cocaine. It is best to crush the pills and snort it for the full "Rush" effect.

Revision:
Concerta is slow release and thus is best used to aid one's concentration. This is particularly effective when one is revising for exams.

Ritalin is metabolized very quickly so the effects of a 10mg pill will only last around 2-3 hours.
Concerta is a slow release form which will last longer (4-6 hours).

For the ultimate results, take a 18mg Concerta in the morning and a 10mg of Ritalin in the afternoon. The Concerta will give you a sustained effect and the Ritalin will turbocharge you when you are beginning to flag.

Don't take it at night or you won't sleep. sleep is very important for laying down memory.

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