There is a Houston company called Tanox that has developed anti-IgE antibodies for treatment of asthma(Xolair, TNX-901) in collaboration with Novartis and Genentech. It turns out it also has application in peanut allergy which is also IgE mediated. There are clinical trials under weigh.
Apparently, since Xolair is approved for one disease, doctors have the right to prescribe off-label for peanut allergy if they wish, even though the drug is not approved for that use. Good luck getting your doctor to do that.