Maintaining daytime alertness can be challenging for people affected by certain sleep disorders. Modacharge 200 mg contains modafinil, a medicine that promotes wakefulness in appropriate clinical situations. It may be used for excessive sleepiness associated with narcolepsy and shift work sleep disorder. It can also have a role in managing residual sleepiness associated with obstructive sleep apnoea. The correct dose and treatment schedule should be determined by a healthcare professional.