Modalert tablets may be familiar to you. The tablet is a stimulant that helps narcoleptics stay awake by boosting dopamine levels in the brain and decreasing dopamine reabsorption into the nerves. Dopamine is a chemical neurotransmitter that keeps us alert during the day and helps us sleep on a regular schedule. To help you stay alert during the day and keep a normal sleep pattern, take the Modalert 200 pill in the morning or evening.