question: I have recently started taking Metronidazol for a bacterial infection. Suddenly, the same day I started taking the medicine my right eye has started to swell. At first I thought it was just a stye and I did rub my eyes with a tissue the same day I started taking the medicine. It has been four days and my eye keeps getting worse. I have avoided makeup around my eye and am applying warm, wet compresses regularly. Is this a side effect to the medicine? I haven t had a stye in years and never this swollen before.