One symptom many individuals withdrawing from stimulants report during withdrawal is depression. Because stimulants make users feel good by increasing the body and brain’s production of a variety of “feel good” neurotransmitters—like dopamine, serotonin, and norepinephrine—it can take many weeks or even months before the recovering addict begins to feel good again. Depression can make an addict more vulnerable to relapse since using is a sure way to once more flood the brain with the absent “feel good” neurotransmitters.