I started my 2 yr old Rex on Lysine 500mg once a day this last week. We have gone to vet multiple times over the past 1 1/2 for his uri. He has had shots, pills liquid and none has cleared his uri for more then a week. He is negative for luke, and aids so I am leaning toward the herpes virus. Everything I read on it seems to say treat with lysine but how long and when will I see some rwsults. All he does is sneeze and have congestion. He eats, plays uses the litterbox. Inside only just like other 2 cats and they have no symptoms of a uri....help plz
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