My brother was helping me give my guinea pig medication this morning. They have been prescribed antibiotics and an anti flea/tick medicine "Revolution" that was to be applied a month after the first application. The antibiotics have been being given to them once daily for the past few days. While I wasn't paying attention my brother didn't read the lable and fed one of my guinea pigs his dose of revolution? What should I do? Will this kill my guinea pig? I don't have a car or any method of transportation right now and no vets are open anyway around here this early. Someone please help.