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

having the certification could make the person more required to do a certain thing then another.this could also lead to different job offers or opportunities.

answer:

there is no cure for hiv, although antiretroviral treatment can control the virus, meaning that people with hiv can live long and healthy lives. most research is looking for a functional cure where hiv is reduced to undetectable and harmless levels in the body permanently, but some residual virus may remain. most commonly hiv-antivirals are taken also known as nucleoside/nucleotide reverse transcriptase inhibitors (nrti's).