The initial adult dose to treat attention deficit hyperactivity disorder is 5mg orally 1-2 times a day. The doctor will increment this medicine by 5mg. The maximum dose should not increase by more than 40mg. For the extended-release tablets, you can take 20mg per day. The initial doses should be in the interval of 4 to 6 hours. The initial adult dose to treat Narcolepsy is 10mg orally per day in divided doses.​