Changes to our eating a drinking habits are common around Christmas, when families gather for rich meals and indulgent desserts. But the UK’s medicines watchdog has urged the public to consider how common medications may interact with unusual food and drink, including sugary treats and certain cheeses. Some can reduce the effectiveness of medicines or increase the likelihood of side effects.
The Medicines and Healthcare products Regulatory Agency (MHRA) highlighted the example of warfarin, a drug commonly used to prevent and treat blood clots. Cranberry products, including juices and sauces, may increase the likelihood of bruising or bleeding in people taking warfarin.
Meanwhile, leafy greens and brassica vegetables such as Brussels sprouts, broccoli and cabbage are rich in vitamin K, which can reduce the effectiveness of warfarin when eaten in large or inconsistent amounts.
The MHRA said such foods do not need to be avoided entirely, but anyone taking warfarin should keep their intake of foods rich in vitamin-K consistent.
Another example is the effect of sugary snacks such as chocolate and sweets on blood sugar levels for people with diabetes who use insulin.
The watchdog suggested enjoying these foods in moderation and following guidance given by a healthcare team.
Tyramine-rich foods, such as aged cheeses, cured meats and dark chocolate, can also cause problems for people taking certain medicines like monoamine oxidase (MAO) inhibitors, which are a type of antidepressant.
The agency advised anyone taking one of these medicines to check the information provided with their prescription and follow the recommended food restrictions.
Dr Stephanie Millican from the MHRA’s Safety and Surveillance team, said: “Many people don’t realise that what we eat and drink can affect how some medicines work.
“With a little planning and the right advice, you can enjoy your festive favourites while keeping your treatment on track.”
The MHRA added that patients should read the Patient Information Leaflet (PIL) that comes with medicine and to ask a pharmacist or GP if unsure about possible interactions.