Heatwave Risks: Common Medications Can Be Deadly Traps

As temperatures remain high, millions of people are at increased risk of dehydration and heatstroke. Health authorities are reminding the public that certain prescription and over-the-counter medications can make individuals more sensitive to the sun and hinder the body's ability to regulate temperature.

Dr. Alison Cave, chief safety officer at the MHRA, stated that some commonly used medications can affect the body's hydration, temperature regulation, or sun protection capabilities. She urged individuals on specific drug groups to exercise extra caution during hot weather. The mechanisms vary: some drugs increase fluid excretion, others affect the brain's thermoregulation center, and some reduce thirst or the body's ability to sweat, a crucial cooling process.

Diuretics, often prescribed for high blood pressure and heart conditions, are among the riskiest. While they help the kidneys excrete excess salt and water, they significantly increase the likelihood of dehydration, a danger already amplified by heatwaves. Similarly, blood pressure medications like beta-blockers can slow heart rate and impede the circulatory system's adaptation to heat. Medications for mental health conditions, including antidepressants (like sertraline, citalopram, fluoxetine) and antipsychotics (such as olanzapine, clozapine, quetiapine, risperidone), can disrupt temperature regulation by affecting the hypothalamus, potentially leading to increased sweating and faster dehydration, or even heatstroke in severe cases.

Beyond dehydration and overheating, many medications can cause photosensitivity, making the skin highly susceptible to sunburn. This includes common antibiotics like doxycycline and tetracycline, acne treatments like isotretinoin and topical retinoids, and certain antifungals. Patients taking these medications are advised to take extra precautions to protect their skin from sun exposure.