For an 11-month-old child weighing 8.5 kg, the typical dosage of Oflomac-M suspension (50mg Ofloxacin/100mg Metronidazole per 5ml) is usually 2.5 ml to 3 ml, taken twice daily. However, because Oflomac-M is a potent combination of an antibiotic and an antiprotozoal, it should never be given without a direct prescription. Incorrect dosing can lead to serious side effects or ineffective treatment. Please consult your pediatrician immediately for an accurate prescription and treatment duration tailored specifically to your child's infection.