Can any of you guys put me straight on this one, i've read on this site that Nolvadex can in some cases have opposite effects

A very rare but all the more serious problem of Nolvadex is that in some cases it does not lower the estrogen level but can increase it

Now i've read alot on these boards about people and gyno symptons, is it really wise to recommend nolv if there is a chance of this happening..

Does anyone know of the cases where this can happen....Why can this happen, what are the circumstances....