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ADHD Medication - Choosing the Right One Medication is an important component of ADHD treatment. Finding the right medication could take a while, since different medications affect individuals in different ways. Stimulants raise levels of brain chemicals that help control impulses and focus. They also can cause adverse effects like shaky fingers, stomach upset, and an increased heart rate. Stimulants Stimulants are medications that "stimulate" brain processes and activity. They can improve alertness, attention and energ