Assess for dehydration. Rehydrate the patient, and monitor frequently. Then reassess hydration status. Give an oral antibiotic to the patient with severe dehydration. Feed the patient.
Tears are a relevant sign only for infants and young children.
Rehydrate the patient, and monitor frequently. Give IV fluid immediately to replace fluid deficit. Use Ringer's lactate solution or, if not available, normal saline. Start IV fluid immediately. Monitor the patient very frequently.