Dd2 has been unwell all week and now has a barking cough, this afternoon i panicked and phoned the gp (i thought she had whooping cough), they were unable to see her but gave advice over the phone, they said it sounded like croup. The dd's have never had croup so i don't know a lot about it. We have filled the room with steam and were trying to get her to sleep. How long will this last? (this is the second night of coughing), the gp gave her antibiotics a few days ago as he thought she might have an infection, will these help with the croup or are they a waist of time?