Yes it works on drugs that have a progesterone(sp?) effect. Such as a-50, deca, tren, and some others I can't remember. I am not sure how it works though. Try doing a search to learn more. I'm sure X-Cell could explain it better. He is the anti-e guru.
Bromocriptine is used to treat quite a few conditions. Just a few are Parkinson’s, acromegaly, amenorrhea; it also is used to reduce prolactin secretion in men and woman. Bromocriptine also stimulates dopaminergic, alpha and beta-1 receptor sites and because of these actions it can help in reducing body fat.
Beware though, this also means that any other drug or substance that increases adrenaline, noradrenaline or dopamine would need to be greatly reduced or avoided all together. One of the most common over the counter fat burners to avoid would be ephedrine or anything that contains ephedra alkaloids. The combination with bromocriptine could make you sick, or worse.
To your question on efficacy, if you want to reduce body fat, in my experience, it seems to work well. Not much better than the old ECA stack but tolerance and negative side effects are less of a problem.
I started with 1.25mg daily in the AM with food for the first week. Then to 2.5mg AM daily on the second week. I titrated the dosage to 5mg once in the AM and had very few negative side effects. I understand the maximum dosage can be much greater for some but the 5mg once a day worked for me.
10 weeks was enough for me on the first go around and I am back with the old ECA stack on cardio days only.
If you decide to try bromocriptine, don’t take it too late in the day or you will spend lots of very late hours awake. Probably on this site!
Thanks for the very concise answer Brent! I was just going to respond via gnpower's response (I'm not anywhere near guru status ). Bromocriptine has been used by some to counter prolactin-related gyno from tren. The jury is still out as to whether tren-related gyno is caused by prolactin, progesterone, or IGF-1 related causes.