threo-4-Methylmethylphenidate(4-MeTMP) hydrochloride is a stimulant drug whose chemical structure is related to methylphenidate, but has a weaker effect than methylphenidate, as originally stated. threo-4-Methylmethylphenidate may be a drug for the treatment of stimulant drug abuse. The compounds 4-fluorine and 3-chlorine may make this drug more powerful than methylphenidate, but less effective at blocking the dopamine feedback.