Stimulant

stimulants are medications that are used to increase alertness, focus and energy. They work by increasing the levels of certain neurotransmitters, such as dopamine and norepinephrine, in the brain. This helps to improve mental alertness, reduce fatigue and improve concentration. Stimulants can also help to reduce appetite, and can be used to treat certain medical conditions, such as narcolepsy. Stimulants can have side effects, including insomnia, anxiety, irritability and restlessness, so they should be taken under the direction of a doctor.