Hello, Kindly mention your clinical complaint and which fluid is given for gram stain that should be mentioned for giving more comment. Metronidazole broad-spectrum antibiotic and especially effective against the anaerobic organism. It can be taken if indicated. Mention your complaint and provide a report as an attachment for giving more comment. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Parth Goswami