Life-saving medicines used by millions of people in Britain, including insulin, asthma inhalers and weight-loss drugs, can lose effectiveness when exposed to warm temperatures

On BBC Morning Live, Dr Ranj Singh said the heat makes changes to how the body reacts to medications

Meds expert has warned anyone on these drugs they should take action to protect themselves as the temperatures rise this week

Life-saving medicines used by millions of people in Britain, including insulin, asthma inhalers and weight-loss drugs, can lose effectiveness when exposed to warm temperatures