Adderall 12.5 mg is usually prescribed to children over the age of 18 years old. This is a peach-colored pill in a round shape. 12.5 is imprinted on one side and d p is imprinted on the other side of the pill. This is used to treat attention deficit disorder and also the sleeping disorder Narcolepsy. This medicine works in the Central Nervous system by changing the amounts of certain natural substances.