The risk for heat-related illness and death may increase among people using the following drugs:

1. psychotropics, which affect psychic function, behavior, or experience (e.g. haloperidol or chlorpromazine);
2. medications for Parkinson’s disease, because they can inhibit perspiration;
3. tranquilizers such as phenothiazines, butyrophenones, and thiozanthenes; and
4. diuretic medications or “water pills” that affect fluid balance in the body.