Many people find that modafinil works on the first day. Within 30 to 60 minutes of the initial dosage, users often experience enhanced alertness, decreased tiredness, and improved attention; these effects peak a few hours later. However, the severity might change based on the patient, the ailment being treated, the dosage, the metabolism, and the quality of sleep. For some users, Modvigil 200 mg, a frequently recommended dosage, may feel potent on the first day. For others, after a few days of usage, the body adjusts, and the advantages become more reliable.