Modalert 200 (modafinil) can affect brain function by altering neurotransmitters such as dopamine, serotonin, and norepinephrine, which are involved in mood, alertness, and cognition. It mainly improves intelligence and cognitive performance by promoting activity in the brain's consciousness centers. Although these changes are usually temporary and are intended to improve concentration, and alertness and reduce fatigue, modafinil does not fundamentally change the structure of the brain. Long-term drug use or abuse can cause side effects, such as addiction or mood changes. It is important to use Modalert under medical supervision since its effect on the brain can vary between individuals.