Just to say that pirenzepine (PZ) in pill form already exists. I’m in the U.K. and here it is used for hypersalivation (drooling) caused by other medications. Apparently it used to be used for stomach ulcers. It would be worth looking to see if it is available in the US. The scientists at WinSanTor, specifically Paul Fernyhough is conducting preclinical studies to see if PZ induces outgrowth in autonomic nerves.