As summer temperatures rise and heat waves become more frequent, health experts are advising people who take certain medications to be aware of possible heat-related risks. Some commonly prescribed drugs can affect the body’s ability to regulate temperature, maintain hydration, or recognize early warning signs of heat illness.
Medications linked to increased heat sensitivity include antidepressants, antipsychotics, beta-blockers, antihistamines, diuretics, diabetes drugs, GLP-1 medications, stimulants, and some anticonvulsants. These medicines may contribute to dehydration, reduced sweating, altered thirst signals, electrolyte imbalance, lower blood pressure, or impaired awareness of overheating.
Antidepressants and antipsychotics can interfere with sweating and temperature regulation. In some cases, they may increase the risk of heat exhaustion or heatstroke. Lithium, used in some psychiatric conditions, may become toxic if dehydration occurs.
Beta-blockers, often prescribed for high blood pressure or heart rhythm conditions, can reduce the heart’s ability to respond to heat stress. Antihistamines may suppress thirst and affect temperature control. Diuretics, which help the body remove excess salt and water, can increase fluid loss and dehydration risk, especially when sweating increases in hot weather.
People with diabetes may face additional challenges because the condition can affect sweat glands and hydration. Experts say those using insulin or other diabetes medications may need to monitor blood sugar more often during hot weather. Metformin and GLP-1 drugs may also increase dehydration risk, partly because appetite and fluid intake may decline.
Stimulants used for ADHD may affect thermoregulation and reduce appetite, which can also reduce fluid intake. Some seizure medications, including topiramate and zonisamide, may decrease sweating, particularly in children.
Health professionals emphasize that patients should not stop taking prescribed medications without medical advice. Instead, they should speak with a healthcare provider about individual risks, drink adequate fluids, avoid excessive heat when possible, use sun protection, and seek medical care promptly for symptoms such as dizziness, confusion, fainting, heavy sweating, or lack of sweating.