Modafinil 400mg is an approved prescription drug that induces wakefulness and can be taken to increase the level of alertness in adults suffering from sleep disorders. The use of this drug depends on the decision of a doctor and includes cases of narcolepsy, obstructive sleep apnea, and shift work sleep disorder. It acts through stimulation of brain substances responsible for wakefulness and attention; however, the exact mechanism of action remains unclear. This dose of the drug is higher than the daily dose recommended for most patients, thus its application requires special approval from a health specialist. Headache, nausea, nervousness, dizziness, dry mouth, and insomnia are possible adverse effects; more severe ones, such as allergic reactions or psychological disturbances, are rare but must be treated by a doctor immediately. This drug interacts with some other medicines, for example, with hormonal birth control drugs. It is not supposed to substitute sleep and cannot be used to treat simple fatigue.

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