Janice -
I do believe you are correct about slowing the drip. Anyway, I did two of them, and my doc just preferred me to stop for the time being. My veins are still scarred 9 months later, but they are better than before.
I found some info on the vitamin C flush:
Vitamin C Flush
When I do flushes, I use 1 teaspoon in 4 oz of water and drink it. I do this every 1/2 hr until I flush. You can also do something called an accelerated flush once you have done a number of these, where you take your usual amt that you flush with over an hour's period of time and then just wait 1/2 hr, then start taking 1 tsp every half hour from there until you flush.
I do the accelerated flush mostly because my need for vitamin c is so high, it would take me too many hours to flush. My doc has me do these every week to every other week.