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The most commonly prescribed drug, methylphenidate, can cost private patients between £15 and £50 per month.

After the shortage began, Deborah was always able to get hold of one of his medications, methylphenidate, but the exact brand would vary each month.

In several Mexican cities, about half a dozen samples of methylphenidate — commonly known in the U.S. by the brand names Ritalin and Concerta — did not reveal abnormalities.

Consistent with previous research, this study showed that when participants received methylphenidate orally, the rate of dopamine increases peaked more than an hour after administration.

For some children, methylphenidate, commonly known by the brand name Ritalin, is the best option.