The loose motions could be due to the antibiotic or viral infection which first affects the respiratory system and then moves onto the gastrointestinal system Keep your child well hydrated. Apart from the medicine, u can also try sponging to reduce body temperature. Viral fever may continue for 3-4 days in spite of antibiotics. If the fever doesn't go down even after 2days of antibiotics u may have to consult your pediatrician again