People with sleep-related conditions such narcolepsy, obstructive sleep apnea (OSA), and shift work sleep disorder (SWSD) sometimes use Modvigil 200 (modafinil) to increase their alertness. It enhances attentiveness and lessens excessive afternoon drowsiness. Off-label, Modvigil 200 is occasionally taken to improve focus, mental clarity, and cognitive function by professionals, students, or those with attention issues. It is also being investigated as a supplement to treat depression by lowering tiredness. However, it should only be used under a doctor's supervision since, particularly in sensitive people or after prolonged usage, it may result in headaches, anxiety, sleeplessness, or an elevated heart rate.