Monodox is used as an anti-bacterial drug. Monodox is used for treatment of various bacterial infections. Acne and Malaria are two common diseases can be cured using Monodox. Monodox is of drug class tetracycline antibiotic drugs. Monodox works by checking the growth of the bacteria. However, you cannot use it for viral infection treatments like common cold and flu. Unnecessary use of Monodox cannot be that effective.