Modalert 200 is primarily designed to promote alertness and attention, especially in those with sleep disorders such as narcolepsy, sleep apnea, and shift work sleep disorder, but is not specifically intended to improve physical endurance. Modalert reduces fatigue and maintains mental focus, leading to increased productivity and cognitive endurance, but its effect on physical endurance is indirect. By maintaining the user’s attention and focus, it can provide the energy needed for prolonged mental tasks, but it does not directly improve physical endurance or athletic performance. Using Modalert solely to improve endurance should be done cautiously and under the supervision of a physician, especially when used for non-medical purposes, to avoid side effects such as insomnia, anxiety, and heart problems.