By promoting brain activity, Modalert 200 can boost mental vigour and alertness, which makes it simpler to maintain attention and wakefulness.  Narcolepsy, sleep apnea, and shift work sleep disorder are among the sleep disorders for which it is frequently recommended.  Although it doesn't provide the same physical energy boost as exercise or coffee, many users say they feel more driven, focused, and productive.  It is not a replacement for sleep, though, and if used incorrectly, it can cause negative side effects including irritation, sleeplessness, or anxiety.  Modalert 200 should always be used under a doctor's supervision for safe and efficient effects.