Modalert 100 Tablet&mdash;A prescription wakefulness-promoting medicine containing modafinil, used to <strong data-start="667" data-end="706">reduce excessive daytime sleepiness associated with narcolepsy by helping you stay awake and alert throughout the day. Modalert 100mg works on brain neurotransmitters to support the sleep-wake cycle, improving daytime functioning. Taken as directed by a healthcare provider, it&rsquo;s part of an effective long-term management plan for narcolepsy and related sleep disorders. Common side effects may include headache, nausea, nervousness, or insomnia.