I already had neuropathy when I received my second dose so they blame it on that. My fasciculations started about 3 weeks after my 2nd dose. My friend with a neuromuscular disease was told by his neurologist not to get a booster. From what I'm seeing this side effect is more common than they are letting on. My legs fasciculations are 24 hours a day. I don't feel them as long as I'm moving. The only thing that helps me is ice,I put it on my feet and under my knees and it calms them down a bit. My body was already jacked up after taking Lipitor so who knows what drug caused it. I haven't been able to rest because of these fasciculations.