I think the effects are a bit more widespread than is realised. If that was 2008 then 2012 will have brought more. Also all the warnings I have seen have only stipulated grapefruit yet the report says other citrus fruits too.
A study has listed 43 major drugs which are affected by eating grapefruits or drinking the juice and experts have warned there needs to be more awareness of the risks. The number of drugs that interact with grapefruit increased from 17 in 2000 to 43 in 2008, researchers in Canada found. Eating one grapefruit a day or drinking 200ml of juice was enough to trigger significant side effects in some of the patients. Elderly patients were at particular risk because they are more likely to eat grapefruit and be on the medicines that interact with it, while their bodies are less able to cope with the effects of an overdose, the researchers said. Grapefruits and some other citrus fruits, contain specific chemicals that affects an enzyme in the gut which can lead to a greater proportion of the drug being absorbed into the body. This can result in massive overdoses causing serious side effects ranging from hallucinations, low blood pressure, to kidney poisoning, muscle damage, high heart rate and breathing problems.