Jordan is getting 500 mg a day of L-Lysine because he has a history of F.H. The problem is he is also on Pred. I've noticed some sporatic sneezing lately and I'd really prefer to stop it before it flares up completely. I'd call his vet but it's Friday & he doesn't work Friday's. So I'll call on Monday, but I'm wondering if anyone knows if I can give him more than 500 mg?