Nizonide 500mg contains nitazoxanide, an antiparasitic and antiviral medication. It works by interfering with the energy metabolism of parasites and certain viruses, inhibiting their growth and replication. The nizonide 500mg is commonly prescribed for treating diarrhea caused by Giardia lamblia and Cryptosporidium parvum. It also shows potential against viral infections by blocking viral protein synthesis. The drug is well-absorbed in the gastrointestinal tract and metabolized into its active form, tizoxanide. Nizonide 500mg is generally well-tolerated, with mild side effects like nausea or headache. Always take Nizonide 500mg as prescribed by a healthcare professional for effective results.