Methylphenidate is a medication that is used to treat Attention Deficit Hyperactivity Disorder (ADHD). There are two main types of methylphenidate: immediate release (IR) and extended release (ER). The main difference between the two types is the amount of time the medication lasts in the body. IR medications last for a short period of time, while ER medications last for a longer period of time.

There are several different types of ER methylphenidate: Concerta, Metadate CD, and Ritalin LA. Concerta is the most popular type of ER methylphenidate. It comes in a pill that is 18 mg, 27 mg, 36 …