From the active ingredient list it looks like a homeopathic tincture, not an antibiotic - but it's definitely a good homeopathic for a sick rabbit.I have a antibiotic for fevers and colds for rabbits so I will be giving it to him now. This in the antibiotic. its in German.
We have used Goldenseal in the past for sick bunnies who needed antibiotics and even now if you research it, goldenseal is a good antibiotic for bunnies. We always gave about a quarter tsp every for hours during the day and let them be at night. Warm cloth to help clean stuffy noses as mentioned. We also gave them a dab of unflavored yogurt for a few days after to replace the good bacteria. This is what we did. We recently had a bout of wry neck and all our bunnies are now well again but one still has a bent neck. Better though. (thanks to the info from everyone on here/ this is indeed a wonderful forum to help). Hope your bunny feels better soon.currently I’m syringe feeding him water and smashed pellets.