ECA.... in particular the ephedrine is a beta-2 antagonist (very similiar to clen, yet weaker)... there is argueably some beta-3 activity as well....

so the 2 weeks on, 2 weeks off basis... IS a good idea.

I'm not a big ECA fan anyways..... I hate the crash.

Another tip for ECA use (if you choose todo it) is to spread your total daily doseage into smaller more often doses... meaning take a smaller amount more often, but do not increase the total daily dose.

For example, if your ECA product directions say "take two tablets two to three times daily"... well instead of taking two tablets every four hours... take one tablet every 2 hours.... that way the body gets a more steady supply.