The maximum human dosage of Advil for adults is no more than 800 mg at a time, according to Drugs.com. In the span of one day, the maximum dose is 3,200 mg, or four 800 mg doses.
Exceeding the maximum dose can result in damage within the stomach and intestines, according to Drugs.com. When using Advil, it's best to take the minimum amount necessary to relieve pain. To ease or eliminate any possible stomach discomforts, it's advised to take this medication with food or milk. Those who take Advil for a prolonged period of time should consult a doctor to make sure there is no internal harm being done.