So all you have to do to block any chemical is to let it build up to a critical level and then use a big mental effort to shock the receptors and they won't work anymore. I don't actually know exactly why how or what really happens that achieves this, but it works. I did it with multiple different chemicals and sensations related to bipolar syndrome and I'm now not manic, not hypersexual, not depressive, and not easily irritable. You don't need some kind of external energy source, but it's pretty tough to actually let the chemicals build up without venting to reduce them and then to also focus on hitting different neurons as they start to process the chemicals and get your whole system. Also it helps to know about chi and use your arms to increase the strength of the signals that deactivate the receptors through proximity to the weak electric fields produced through your arms. And being low body fat helps too because the stuff will go to your stomach.