Coincidently, I started about a month ago to drink grapefruit juice after a break of almost 6 years. I had stopped when I was put on statins.

I have not noticed an effect that I can directly attribute to grapefruit. However, the last few weeks have been good for me. I had put this down to more exercise, both normal and forced.

Regarding the literature, see the blog of D. J. Kroll:

http://scienceblogs.com/terrasig/200...a_drug_boo.php

"Grapefruit juice as a 'drug booster': don't try this at home"

Linking this to another current thread there are comments on the impact of grapefruit juice on DXM.

John