I had been doing well on compounded pyridostigmine, as I'm allergic to the fillers in all the FDA approved versions, but it has become unavailable, so I am looking into Huperzine A as an alternative. I'm hoping the Huperzine has fewer digestive system effects. I had occasional nausea and regular cramping and bloating on 30mg taken 3 times a day, which seem to be known side effects.