May I add a piece to it? One thing we use to distinguish schizophrenia from drug toxicity of a number of types is that schizophrenia tends to have hearing voices, auditory hallucinations, while mefloquine is marked by visual hallucinations, as are other hallucinogens. I think the relationship of seeing the visual hallucinations when somebody's on mefloquine...that seems very likely.
On May 1st, 2019. See this statement in context.