Heat Threatens Medications and Batteries Left in Cars

High interior temperatures in parked cars can easily exceed 60 °C, which may degrade medicines such as insulin, biologics, certain antibiotics, eye drops and liquid formulations. Experts advise keeping drugs in their original packaging, avoiding direct sunlight, using insulated bags when transport is necessary, and discarding any medication suspected of heat exposure.

Extreme temperatures also affect automotive batteries. Cold weather slows the internal chemical reactions, reducing the battery’s capacity and making engine start‑up harder. Excessive heat accelerates wear by speeding up chemical reactions and evaporating electrolyte, leading to premature corrosion and a shorter service life. Drivers are urged to monitor battery health, consider thermal insulation, and use chargers or maintenance routines during temperature extremes.