Betadine Sore Throat Gargle is an anti-viral and anti-bacterial sore throat treatment that kills bacteria and viruses. A sore throat may be due to a number of causes including smoking, allergic reactions and other factors. Most commonly though, they are due to a bacterial or viral infection of the throat. Betadine Gargle kills most bacteria and viruses implicated in sore throat (pharyngitis) within 30 seconds and may be used as an aid in the treatment of such an infected sore throat. Betadine Gargle should not be swallowed and must be diluted before use.