Posted by Howi on 14/09/2018 09:20:59:
there seem to be many beers that have a slight fruitiness to them, my favourite being grapefruit (only a hint mind you).
i cannot have normal grapefruit as such as it defeats the purpose of the statins they have persuaded me to take.
doesn't stop me having the beer though 
What happens is that the same enzymes in the liver that get rid of the statins are also used up getting rid of some of the grapefruit chemicals. This means that the liver is less able to get rid of the statins and the concentration of them becomes higher than expected (with the achy muscles and other symptoms if sufficiently extreme). Your doctor might not be enough of a chemist to tell you this, but you can adjust the statin dose downwards until you don't get the symptoms.
I actually had to cut my dose due to getting symptoms, then three months later, when collecting a script, the pharmacist took me to one side and told me that he'd just read a new warning of an interaction with Amlodipine calcium channel blockers. I thanked him and said that explained the problem. Blood tests show that they're working as well as ever, even at the now-reduced dose.