A UK emergency doctor says consuming the fruit can interfere with how the body processes the medication and raise the risk of side effects
Consuming too much of the fruit raises the risk of experiencing unpleasant side effects(Image: Getty )
A UK-based doctor who works in emergency care has warned patients taking certain statins about the dangers of consuming a common breakfast food and drink item. He mentioned that having it regularly, while taking popular cholesterol-lowering medications, could result in harmful side effects.
Dr Alex Wibberley, an emergency medicine expert with ten years of experience in the NHS, shared advice with his 548k YouTube subscribers in a recent video. The video is called: “Taking Statins? 7 Things Your Doctor Might Not Have Mentioned.”
In the clip, Dr Wibberley emphasises that consuming grapefruit or drinking grapefruit juice can disrupt how your body metabolises certain statin medications. He explained that this particularly impacts simvastatin and atorvastatin, reports the Mirror.
He said: “Did you know that a grapefruit can change how much of your statin actually ends up in your bloodstream? Now, this is not an old wives’ tale, as it may sound. There is real chemistry behind it.”
An estimated seven to eight million adults in the UK take statins to lower cholesterol and protect against heart disease. According to the NHS, too much cholesterol can block your blood vessels. It makes you more likely to have heart problems or a stroke.
Why can grapefruit cause issues?
He explains the problem relates to fundamental chemistry within the digestive system. Under typical circumstances, a particular enzyme, known as CYP3A4, in your gut wall metabolises a proportion of these medicines before they enter your system.
This mechanism ensures that the quantity of medication reaching your bloodstream remains within the recommended safe threshold. However, natural compounds present in grapefruit prevent this crucial enzyme from working correctly. As less of the medication is metabolised, significantly more is absorbed into your system than intended.
Dr Wibberley said: “Your gut wall contains an enzyme whose job it is to break down part of certain drugs before they are absorbed into your system, keeping the amount that reaches your blood inside the intended range. Grapefruit, however, and grapefruit juice block that enzyme.
“So if you eat grapefruit regularly while taking one of the statins that rely on it, particularly simvastatin or atorvastatin, less of the drug gets broken down. More of it is absorbed than it was meant to be, and then the level in your blood can climb higher than planned, and that really does raise your risk of side effects like these muscle problems because there is more in your blood than intended. It’s like taking, you know, extra doses when you’re not supposed to.”
What are the potential side effects?
When blood concentrations of the drug exceed the recommended levels, the effect mirrors that of taking additional doses. Dr Wibberley warns that this substantially increases the likelihood of experiencing adverse side effects, especially muscle pain, aches, and weakness.
- Muscle pain and weakness: Elevated drug levels often cause unexplained muscle aches, tenderness, or weakness.
- Rhabdomyolysis: In rare cases, severe muscle breakdown can occur, releasing proteins into the blood that may lead to kidney damage or failure.
- Liver issues: Higher concentrations can also place extra stress on your liver.
Does grapefruit interact with all statins?
Dr Wibberley notes that this interaction does not affect all statins and that consuming grapefruit occasionally is unlikely to cause any notable issues. Nevertheless, for those who eat grapefruit or drink its juice on a regular basis, Dr Wibberley strongly advises consulting a healthcare professional.
He explained: “When the true level of the drug in your blood is pushed well above what your doctor intended, real muscle problems really do become more likely. It doesn’t apply to every type of statin, and the odd bit of grapefruit here and there, you know, isn’t going to be a disaster. But if you’re having grapefruit or drinking the juice most days, it is really worth 30 seconds with your pharmacist who can tell you instantly whether it matters for your particular tablet.”
What does the NHS say about atorvastatin and grapefruit?
The NHS advises that grapefruit and grapefruit juice can be consumed in moderation while taking atorvastatin, though large quantities should be avoided. According to the NHS Atorvastatin Guide, an occasional glass or small amounts of grapefruit juice are broadly regarded as safe.
However, consumption should not exceed one or two small glasses per day, and you should avoid large quantities surpassing 1.2 litres daily. Should you have any queries or concerns, seek advice from your GP or pharmacist. Never discontinue taking your medication without first consulting a healthcare professional. For non-urgent medical advice when your GP or pharmacy is closed, call 111 or visit 111.nhs.uk.
