Heat Advice - Psychotropic Medication List
PDF - Heat Exhaustion. Heat Stroke. Good list of medications which can impair tolerance to heat although there are many others for various conditions that are not on this list such as some medications for Parkinson's disease, because they can inhibit perspiration. Some tranquilizers. Some diuretic medications. Anticholinergics. Also some Antibiotics, Beta Blockers and ACE inhibitors can cause hypersensitivity to sunlight causing sunburn and rashes. There are many more.
Ask your Doctor.
Extreme Heat FAQ - CDC
Medications that take the fun out of the sun - US Pharmacist Article