[1] Many people complain of low mental energy, which can interfere with work and daily activities.
[6] These neurotransmitters include dopamine, norepinephrine, orexin, serotonin, histamine, acetylcholine, adenosine, and glutamate.
[1] Drugs that may increase mental energy include caffeine, modafinil, psychostimulants like amphetamines and methylphenidate, and corticosteroids like hydrocortisone and dexamethasone.
[1][6][7] Drugs that may decrease mental energy include sedatives and hypnotics like antihistamines, benzodiazepines, and melatonin, as well as dopamine receptor antagonists like antipsychotics.
[1] Chronic fatigue syndrome is characterized by a lack of the energy needed for the basic activities of daily life.