speed and many other drugs continue to be widely used for the purported neuro enhancing effect in addition to l.s.d. there are bitter blockers and modafinil and methylphenidate often called by the brand name ritalin. boys could know is a psychopharmacologist he says that less than one percent of the people who take the drugs are regular consumers which is probably due to the ambivalent effects they have. many so i take such a substance the desired results are often offset by one side don't want motivation and alertness might be enhanced but other cognitive capacities will be diminished. one way psychotropic drugs work is by intervening in the flow of neurotransmitters increasing their concentration or activating their receptors. neurotransmitters carry messages from one nerve cell to the next in the brain and throughout the body