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The peak levels and half life of Ritalin depend on the formulation. But with the immediate release version of Ritalin, methylphenidate reaches peak levels in the blood in about 2 hours. And methylphenidate from Ritalin tablets is eliminated from plasma with an average half-life of about 3.5 hours. As a comparison, in children the average half-life of methylphenidate is about 2.5 hours, with a range of about 1.5 â 5.0 hours.
The half life of sulfamethoxazole is 10 hours, which means that it is eliminated in 10 hours and thus stays in your system for 10 hours. Trace amounts will always be present for longer, but not enough to execute any therapeutic effect. Source(s): http://www.rxlist.com/cgi/generic/gantan... ASGopt Â· 9 years ago.