People suffering from mental illness are at a greater risk of suffering from an episode if they drink energy drinks rich in caffeine

The test was repeated a week later and Menkes said that started to initially laugh and talk constantly, but later withdrew, becoming restless and argumentative. Writing in his report in the Medical Journal of Australia, Menkes said that it proved that energy drinks to exacerbate the condition of some mentally ill patients.
“The fact that our patient had the same reaction on two distinct occasions is important. This is the evidence that some patients with treated schizophrenia may be vulnerable to exacerbation of their illness by caffeine-containing energy drinks”, he said.
Source-Medindia