Modafinil 400 mg means taking a larger daily dose of modafinil, which is a prescribed drug meant to help keep people awake if they have specific sleep problems. Modafinil is used to treat excessive daytime sleepiness caused by conditions such as narcolepsy, obstructive sleep apnea, and shift work disorder. It is usually recommended that the common adult dosage be 200 mg taken once daily. Though it has been proven that modafinil 400 mg per day is sometimes used, there has been no shown advantage in prescribing it as 400 mg rather than 200 mg.



Therefore, it is best to prescribe an appropriate dose depending on the specific sleep problem being addressed, as well as individual responses to the treatment. Some of the common side effects of modafinil include headaches, nausea, dizziness, anxiety, and trouble sleeping. There may also be rare but severe skin and allergic reactions, among others. Modafinil interacts with other medications and with contraceptive hormones. Anyone thinking about using 400 mg should talk to a medical expert.



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