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The Medicines and Healthcare products Regulatory Agency (MHRA) has highlighted that some prescription and over-the-counter medicines can impair the body’s ability to regulate temperature or tolerate sun exposure. Treatments such as diuretics, antidepressants, and beta blockers may increase dehydration or heat stress risks, while antibiotics, acne drugs, and antifungals can heighten photosensitivity. The agency’s ‘Summer-proof your health’ campaign urges patients to review patient information leaflets for specific warnings and consult healthcare professionals if unsure about their medication’s effects.

The MHRA advises simple measures to mitigate risks, including staying hydrated, avoiding peak sun hours, and using protective clothing and sunscreen. Signs of heat-related distress—such as dizziness, confusion, or unusual fatigue—should prompt immediate action. Red, sore, or blistered skin after sun exposure may indicate medication-linked photosensitivity. Patients are reminded not to alter prescribed treatments without medical advice and to seek guidance from pharmacists or GPs if concerned about their medication’s interaction with heat or sunlight.

The MHRA encourages reporting suspected side effects through the Yellow Card scheme, which now supports NHS login for secure access. This reporting helps improve medicine safety monitoring across the UK. The agency stresses that while most medicines are safe when used as directed, awareness of potential risks in warmer conditions is essential for patient safety. The Yellow Card scheme provides a direct route for patients and healthcare providers to contribute to ongoing drug safety assessments.

The MHRA is an executive agency of the Department of Health and Social Care, responsible for regulating medicines and medical devices in the UK. Its ‘Summer-proof your health’ initiative forms part of broader efforts to ensure medicines remain acceptably safe under varying conditions. The agency’s work is based on evidence-based judgements to balance benefits and risks, with all safety communications aimed at protecting public health during seasonal changes.