I think you want to ask about colistop. There are many types and severities of diarrhea
. medicines are decided based on whether or not there is a chance of dehydration
, worsening infection and or chance of viral diarrhea. frequency and quality of stools helps the doctor to estimate the type and severity and treatment will be decided accodingly. As you say child appears energyless, it looks like a medical emergency , please visit a doctor to decide about dehydration management and change of medicines/fluids/feeds.