I was on Tindamax along with 2 other antibios for a couple months and only on weekends (pulsed) in the beginning of my treatment. It was highly effective for me, and I could feel it kicking in busting up whatever the first weekend I took it. I've had lyme for many years so it took awhile but very effective
A friend of mine was on flagyl on weekends (pulsed) and don't know if it worked or not, course he did not have many serious lyme issues, but he still had lyme.
I do understand the cost however. Go with what you can do...