modalert-200 as advised by your physician. Consume the medicine with a glass of water. Do not crush or chew the medicine. Your doctor will decide the exact dose and duration of treatment for you depending on your age, body weight, and disease condition. MODALERT 200MG TABLET contains Modafinil, which belongs to a group of medicines known as Psychostimulants. It is used for the treatment of Narcolepsy in adult patients.