Pharmacist Dr. Giraudon warns against using paracetamol during heatwaves, citing potential risks. This alert follows emerging research on medication interactions during extreme heat, prompting revised public health guidelines.
Pharmacist Dr. Nicolas Giraudon, based at the CHU de Montpellier, issued a public warning on July 4, 2026, advising against the use of paracetamol (Doliprane) during heatwaves. This recommendation aligns with recent findings from a study published in Science et vie, which identified specific medications that may increase mortality risk during extreme heat events. The alert has since been echoed by multiple outlets, including Melty and Parole de mamans, highlighting the need for public awareness about medication safety in high-temperature conditions.
How Heat Alters Medication Metabolism
Extreme heat affects physiological processes critical to drug metabolism. Elevated temperatures can increase blood flow to the skin, diverting resources from the liver, which is responsible for processing paracetamol. This shift may impair the liver’s ability to detoxify the drug, increasing the risk of hepatotoxicity even at standard doses.
"Under heat stress, this pathway becomes overactive, producing reactive metabolites that can damage liver cells.
In Plain English: The Clinical Takeaway
- Paracetamol may pose liver risks during heatwaves due to altered metabolism.
- Heat diverts blood flow from the liver, impairing drug processing.
- Patients should consult healthcare providers before taking paracetamol during extreme heat.
Regional Healthcare Implications
The warning has direct implications for European healthcare systems. The European Medicines Agency (EMA) is reviewing its guidelines for over-the-counter (OTC) medication use during heatwaves, following similar concerns raised by the FDA in 2023.
"Heatwaves are becoming more frequent, and medication safety during these events must be standardized globally. The EMA and FDA are collaborating to update labeling requirements for OTC drugs, emphasizing heat-related contraindications."
Drug Interactions and Heat Sensitivity
While paracetamol is generally considered safe, the study highlighted that certain medications amplify heat-related risks. These include lithium, antipsychotics, and diuretics, which can impair thermoregulation or interact with heat-induced physiological changes. For example, lithium is known to disrupt the body’s ability to sweat, increasing the risk of heatstroke.
A 2024 study in JAMA Internal Medicine found that patients taking lithium had a 2.3-fold higher risk of heat-related hospitalization compared to those not on the medication.
Contraindications & When to Consult a Doctor
- Chronic liver disease
- Alcohol use disorder
- Dehydration or severe fluid loss
- Use of medications that affect liver function (e.g., anticonvulsants, certain antibiotics)
Seek immediate medical attention if heat-related symptoms include:
- Severe headache or dizziness
- Jaundice (yellowing of the skin or eyes)
- Unusual fatigue or confusion
- Dark urine or
Heart attack warning during global heatwave
