Doctors warn common pharmacy pills can become toxic or lose effect during heatwaves

Health authorities are issuing warnings about the potential dangers of common medications during periods of extreme heat. Both prescription and over-the-counter drugs can pose risks, either by becoming toxic or by losing their efficacy when exposed to high temperatures.

The U.S. Centers for Disease Control and Prevention (CDC) highlights that the interaction between excessive heat and certain medications can result in potentially severe adverse effects. The agency has published guidelines for healthcare providers and patients on how heat can affect various treatments. It emphasizes that individuals managing chronic conditions should consult their physicians before hot weather spells to discuss necessary precautions, hydration strategies, and any need for closer monitoring.

Specific drug classes identified as increasing the risk of side effects during heatwaves include diuretics, anticholinergic agents, and certain psychotropic medications. Anticholinergics, for instance, interfere with bodily functions like sweating and salivation, which are critical for regulating body temperature. The CDC also notes that combinations like ACE inhibitors or ARBs with diuretics can significantly elevate the risk of heat-related injury. Newer medications like ARNI for heart failure may also carry similar risks.

For children and adolescents, medications such as non-selective antihistamines, stimulants for ADHD, tricyclic antidepressants, SSRIs, and diuretics can heighten the risk of heat-related illnesses. These drugs can contribute to dehydration and affect blood pressure regulation, making individuals more vulnerable to the adverse effects of high temperatures.