When a person experiences a frequent problem with daytime sleepiness, it is essential to know the causes of this condition. Modafinil 400mg is a prescription medication that helps maintain wakefulness in adults suffering from some kinds of sleep disorders. Medical purposes of the drug include the treatment of excessive sleepiness in narcolepsy, obstructive sleep apnoea syndrome, and shift work sleep disorder.

The drug affects multiple neurotransmitter systems responsible for wakefulness. It has an impact on the action of the dopaminergic system; however, the whole mechanism of the action of the medicine is not completely known yet. Modafinil is supposed to help deal with excessive sleepiness but not replace sleep.

The use of 400 mg is rather a high dose per day and cannot be recommended to all patients. The exact dose of the drug depends on the disease, individual tolerance, medical conditions, and medications taken. A physician will help to decide if this dose is proper for you.

Some adverse effects may include a headache, nausea, dizziness, nervousness, anxiety, dry mouth, and insomnia. The serious allergic reaction and rashes may happen rarely. Also, the drug can affect other medications and hormonal birth control.

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