"Abuse potential
Methylphenidate is a drug of abuse.[125] Methylphenidate like other stimulants increases dopamine levels but at therapeutic doses the increase is slow and thus euphoria does not typically occur except in rare instances. The abuse potential is increased when methylphenidate is crushed and snorted or when it is injected producing effects almost identical to cocaine. Cocaine-like effects can also occur with very large doses taken orally. The dose, however, that produces euphoric effects varies between individuals. Methylphenidate is actually more potent than cocaine in its effect on dopamine transporters. Methylphenidate should not be viewed as a weak stimulant as has previously been hypothesised"
"However, cocaine has a slightly higher affinity for the dopamine receptor in comparison to methylphenidate, which is thought to be the mechanism of the euphoria associated with the relatively short-lived cocaine high.[130] Reports of users experimenting with mixing methylphenidate with caffeine and benzocaine to produce a powder for insufflation (snorting) for an even more cocaine-like effect began to appear in the middle 1970s; this is apparently an incrementation upon a mixture known as Toot containing phenylpropanolamine, caffeine, and benzocaine in the search for legal highs. As moderate doses of cocaine have caffeine-like effects and benzocaine produces a slight stimulant effect of its own perhaps 5 per cent the strength of cocaine with a ceiling in that range, the mixture is reported to have at least some of the sought-after effects.
Patients who have been prescribed Ritalin have been known to sell their tablets to others who wish to take the drug recreationally. In the UK it has been dubbed "kiddie coke" due to its low price and high availability amongst young people. In the USA it is one of the top ten stolen prescription drugs and is known as "Vitamin R" and "The R Ball". Recreational users may crush the tablets and either snort the powder, or dissolve the powder in water, filter it through cotton wool into a syringe to remove the inactive ingredients and other particles and inject the drug intravenously. Both of these methods increase bioavailability and produce a much more rapid onset of effects than when taken orally (within c.5-10 minutes through insufflation and within just 10-15 seconds through intravenous injection); however the overall duration of action tends to be decreased by any non-oral use of drug preparations made for oral use."
http://en.wikipedia.org/wiki/Methylphenidate samme link som tidligere.
Om kemien er den samme, må jeg faktisk melde pas på, men de har i hvert fald mere eller mindre samme virkning og hjælper koppen til at producere mere dopamin.