These children should be referred to hospital for investigation and treatment. Correct dehydration. An antibiotic is needed. Usually, nalidixic acid is given 6 hourly for 5 days (2.5 ml if 12 to 24 months; 5 ml if 2 to 5 years; 7.5 ml if older than 5 years).
Dysentry is usually due to Shigella, which has become resistant over the years to many antibiotics. Ciprofloxacin may be required.