It means not to take a drug daily...many of us take an antibiotic every day, but we 'pulse' some drugs. For example, I pulse Flagyl for one week every month. I take Flagyl only the last week of every month, and then I am off of it for three weeks. I have heard of people who are on more than a two drug combo who pulse some drugs for just a few days each week, too.
Current treatment (began June 10th 2009):
Biaxin 1000mg/day, Pulsing Flagyl 500mg/day 1 Week Every Month
"Breathe. Let Go. And remind yourself that this very moment is the only one you know you have for sure."