When I first brought my herpes foster cat home, she was in the midst of a flare-up. The cat rescue had said to keep them in separate rooms until the cold clears up and then it'll be safe to introduce my cat to the foster. Well, when I found out it was "herpes", I basically freaked out and contacted a few vets and asked for their opinion.
I know it's just like a cold and usually isn't a big deal since so many cats are carriers already, but I couldn't help it - I didn't like the idea of my cat getting herpes and then me having to deal with it every time he feels stressed.
I was then told that the herpes virus is very contagious, even airborne, and chances were, if my cat was going to catch it (this was 6 days later), he probably would've already had it. He didn't display any symptoms. I stopped being so paranoid after that.
On day 10, the foster came out of quarantine after her cold cleared up with L-Lysine supplementation 2x daily and they were together for one month before she got adopted earlier this week. I wish I didn't spend so much time and energy worrying about it at first because my cat didn't catch it and he's completely fine.
My foster was small, maybe even a tad bit smaller than 4 lbs, and the dosage prescribed to her was 250 mg twice a day (total 500 mg daily). When her cold went away, I kept the maintenance dose at 100 mg twice daily (total 200 mg daily). Basically, I slowly decreased the amount every Sunday until I found out what the minimum dosage was before the runny nose, eyes, sneezing, etc., would start again. Mainly because I always want to take a safe and careful approach to pet care and more is not always better, especially with supplements. I know that Lysine is an amino acid and not supposed to be harmful, but I still wanted to take a more "natural" stance.