Nitazoxanide 500 mg is an effective treatment for diarrhea caused by certain protozoal and viral infections, particularly Cryptosporidium parvum and Giardia lamblia. It works by interfering with the energy production of these microorganisms, thereby inhibiting their growth and ability to cause disease. To treat diarrhea with Nitazoxanide, the medication is typically taken orally in tablet or liquid form, with the dosage and duration prescribed by a healthcare professional based on the patient's age and severity of the infection. It is important to follow the prescribed course completely, even if symptoms improve before completion, to ensure the infection is fully eradicated. Common side effects may include nausea, abdominal pain, and headache, but these are generally mild and transient. Staying hydrated and following a doctor's guidance on diet and rest can also help in the effective management of diarrhea while on Nitazoxanide.