# Summary
Certain medications interfere with your body's ability to regulate temperature during hot weather, leaving you more vulnerable to heat-related illness. Ten drug classes pose particular risks.
Antihistamines like diphenhydramine reduce sweating, your body's primary cooling mechanism. Decongestants such as pseudoephedrine narrow blood vessels, limiting heat dissipation through the skin. Anticholinergic medications, which block a neurotransmitter involved in sweating, include some antidepressants and bladder medications.
Diuretics increase fluid loss, reducing the amount of sweat your body can produce. Beta-blockers used for high blood pressure and heart conditions restrict blood flow to the skin. Some antipsychotics and mood stabilizers impair temperature regulation directly. Stimulants like those in ADHD medications raise metabolic rate and core body temperature. NSAIDs can reduce kidney function, affecting fluid balance. Statins for cholesterol and certain antibiotics also carry heat illness risks.
Heat exhaustion and heat stroke develop when core body temperature rises uncontrollably, causing dizziness, confusion, rapid heartbeat, and potentially organ damage. People taking these medications face higher stakes during summer months or intense physical activity.
If you take any of these medications, take precautions during heat waves. Drink extra water throughout the day, not just when thirsty. Avoid peak heat hours between 10 a.m. and 4 p.m. Wear light-colored, loose-fitting clothing. Check in with elderly relatives and friends regularly during hot weather.
Talk with your doctor or pharmacist before summer arrives. Never stop taking prescribed medication without guidance, but discuss whether timing adjustments or temporary alternatives exist. Some conditions require specific drug classes without substitutes, making preventive measures even more important.
Heat illness kills