Lm12

HELP! My vet advised me to give my poorly rescue rabbit F10 antiseptic through a nebuliser to help with his bad breathing. I ordered the concentrated one so needed to be diluted. I nebulised him for 20 mins (as advised) and 20 minutes later he was dead. At first I thought the F10 was too much for his small unwell body, but thinking back I may not have diluted the solution correctly - would this have killed him?! Help