The exotic vet prescribed vetriDMG. It's supposed to help with neurological disease. He prescribed 0.04 ml twice a day for two weeks. My hamster never spasmed again after that.
You can order vetriDMG yourself online, but it's harder if you're outside of the US. A safe site seems to be Vetri Science, although I can't seem to order it to Canada at the moment. Your vet should be able to prescribe it.
I don't think vetriDMG will cure all spasms. I had a male dwarf hamster who had spasms, but they were more like mini strokes. He kept having them until he passed away soon after from a larger stroke (he couldn't move after it). The same vet said it was different than what he saw before. I tried vetriDMG, but it either didn't work or didn't work fast enough because he passed away in days.



