The amount of time that Modalert 200mg stays in a person's system can vary. Usually, it has a half-life of 12 to 15 hours. Consequently, the body needs about 12 to 15 hours to process half of the Modalert 200 dosage. It usually takes two to four days for Modalert 200 to fully depart the body. The duration of Modalert 200's detectability is contingent upon an individual's metabolic status, liver condition, and concomitant pharmaceutical regimen. It's important to take the medication as prescribed and consult a healthcare professional for guidance specific to your circumstances.