Modafinil usually works within 30–60 minutes. This period improves alertness and attention for many people. The greatest effects extend 2–4 hours after consuming it, with advantages lasting 12 hours or longer. Metabolic rate, dietary intake, and drug sensitivity affect reactions. Take modafinil as prescribed, frequently in the morning, to match with normal sleep-wake cycles and reduce nocturnal sleep disturbance.
How fast does modafinil kick in?