Metadate CD and Concerta are both medications used to treat ADHD. They are both stimulants, but they work in different ways. Metadate CD is a time-release medication, and Concerta is an extended-release medication.

Metadate CD is a time-release medication. It is made up of two parts: a methylphenidate part and a stimulant part. The methylphenidate part is released right away, and the stimulant part is released over time. This is why it is a time-release medication. It works for up to eight hours.

Concerta is an extended-release medication. It is made up of two parts: a methylphenidate part and a …