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Essential advice on protecting your medicines during extreme heat and staying safe this summer.

• Updated: 10 July 2025

• Updated: 1 January 2005

• Updated: 1 January 2004

This guide is about infections that occur in people who inject drugs (PWID).

• Updated: 10 October 2025

Get help to classify pharmaceutical products used to treat or prevent diseases or ailments (in humans or animals), including comparators used in clinical trials and placebos.

• Updated: 22 July 2021

This page advises healthcare professionals working within the community, care homes or hospital environments on how to reduce the risks of hot weather to the health of people they provide care for.

• Updated: 19 December 2024

These reports explain our assessment of the scientific evidence used to lead to regulatory decisions on the safety of medicines or medicines classes.

• Updated: 26 January 2026

As the UK enters the heart of summer – with temperatures rising and families holidaying – the Medicines and Healthcare products Regulatory Agency (MHRA) is reinforcing essential safety advice for anyone using medicines or medical devices.

• Updated: 23 July 2025

Understanding gut microbiome interactions with medicines could help explain differences in how people respond to treatment and build on existing medicine safety knowledge to support safer, more effective prescribing in the future.

• Updated: 23 December 2025

Viatris has received reports of brown discolouration and blockage in the needle of pre-filled syringes of Arixtra. This quality defect is related to oxidation of the syringe needle.

• Updated: 28 January 2026