Drink plenty of water regularly and often even if you do not feel thirsty. Your body needs water to keep cool. Avoid drinks with alcohol or caffeine in them. They can make you feel good briefly but make the heat's effects on your body worse. This is especially true with beer, which dehydrates the body.
Heat stroke is life-threatening.
The victim's temperature control system, which produces sweating to cool the body, stops working. The body temperature can rise so high that brain damage and death may result if the body is not cooled quickly. Move the person to a cooler place. Quickly cool the body by wrapping wet sheets around the body and fan it. If you have ice packs or cold packs, place them on each of the victim's wrists and ankles, in the armpits and on the neck to cool the large blood vessels.