Not that many. Let us start with the paradox that stopping seems to work as a cancer therapy?!? http://www. Ncbi. Nlm. Nih. Gov/pmc/articles/PMC3180409/? report=classic Then, not blocking female hormones whoe allow these hormones to begin working. Menstrual cycling possibly returning, breast growth pssible (not likely) mood changes.
Hormonal balance. May effect hormone levels.