If by work down the dosage you mean coming off the drug, then the issue here is the caffeine habit you'll develop(ephedrine is not addictive, and there are no side effects from quitting). I find that when I come off EC, I get a very bad headache the next day. By taking one caffeine pill, it goes away, and the next day the habit is gone.
Off topic, but I'm surprised that ephedrine isn't more embraced by the drug culture, being that it's cheap, legal, and readily available. I've experienced a several highs during cutting cycles with ephedrine, without actively trying to get one.