Is taking 400mg of modafinil at once just one time in the month can be harmful?

MAYBE

Explanation:

Although the maximum recommended daily dose of modafinil is 400 mg, higher doses have been used. There are some patients in whom adequate control of sleepiness may require a slightly higher dose than 400 mg (400 mg in the am and 200 mg in the early afternoon).

Although the maximum recomended dose is 400 so i think its perfectly fine but you should follow the prescriptions that the doctor gave you so that you wont get overdosed

answer:

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explanation:

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