The average Dexmethylphenidate cash price is about $18.85 for a supply of: Tablet 5 MG 30 pcs. Get our free Dexmethylphenidate coupon and be eligible to receive a discount. You can reduce your Dexmethylphenidate cost by up to 75% with our free Dexmethylphenidate discount card. Bring it to a participating pharmacy near you to save on your prescription medication.Dexmethylphenidate is a mild stimulant to the central nervous system. It affects chemicals in the brain that contribute to hyperactivity and impulse control. Dexmethylphenidate is used to treat attention deficit hyperactivity disorder (ADHD). Dexmethylphenidate may also be used for purposes not listed in this medication guide.