Click on this side : https://mayomeds.com/adhd/ritalin/ Ritalin is a central nervous system stimulant. Methylphenidate affects chemicals in the brain and nerves that contribute to hyperactivity and impulse control. It works by promoting wakefulness. It belongs to a group of medications called stimulants. Take this medication by mouth with water. Take it as directed on the prescription label at the same time every day. It is best to take this medication 30 to 45 minutes before meals, unless your care team tells you otherwise. Side effects that you should report to your care team as soon as possible: Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat Heart attack—pain or tightness in the chest, shoulders, arms, or jaw, nausea, shortness of breath, cold or clammy skin, feeling faint or lightheaded.