The Grapefruit Prohibition

In the past year I was having pain shooting through the right side of my lower jaw which I assumed was a dental problem, though it was not affected by hot or cold food or drink. The pain would occur and was excruciating! But, if I kept my mouth still, it subsided. So for days, I avoided eating, and even speaking. After a few days, I couldn't take it because I had to eat, drink, and speak. So, when it hit again one morning, I went to the emergency room at a local hospital.
The doctor was an extremely attractive woman who I thought was too young to be a doctor. She looked at my teeth, touched my face in different areas, and walked over to a computer where she did some searches at several web sites. She returned to me and explained that I have trigeminal neuralgia. The bundle of nerved that runs from the brain splits in three and the three branches comprise the sensory and motor nerves in the face.
She gave me a prescription and I thanked her for seeing me on a busy, weekend morning.
I was able to get the medication later that day, and was greatly relieved when the pain stopped occurring. I have taken this medication two times a day since, but, the neurologist at my MS clinic recently changed their supplier for this medication and, as I read the bright yellow warnings on the bottle this morning, it said not to have grape fruit or grapefruit juice.
I had not ever heard of grapefruit being something to avoid! (What will I do NOW?) Seriously, on this hot, humid day, thinking so much about grapefruit juice makes me really want some.