Officials issue a short-term health warning starting Monday, June 22 for people taking metformin and beta blocker medications, citing risks related to hot weather. Multiple outlets report that a pharmacist and medical experts highlight how high temperatures can affect the body’s ability to tolerate certain drugs and can increase the likelihood of side effects during heatwaves. The guidance is described as lasting four days, with the message focused on helping patients manage medication use safely while temperatures remain elevated. While details vary by outlet, the common theme is that some medications may be less effectively tolerated in heat and could require extra attention to hydration, symptom monitoring, and the timing or awareness of potential adverse effects. The reporting also notes that heat can influence medication performance generally, reinforcing the need for people on at-risk medicines to follow official advice and seek professional support if they experience concerning symptoms. The warning is presented as preventative health information for medication users during the summer heat.