I've read a few testimonials and caffiene can make the phentermine lose it's effectiveness...it washes out of the system more quickly. (I'm sorry, I don't have an absolute medical reference for this one.)
So how far have you cut back on your caffiene? I easily had 2 cups of coffee and a glass of soda (diet naturally!
) in a day. I wonder how much of my headache is from cutting back to one cup of coffee.