Hello, Welcome to Healthcare Magic. Gardnerella Vaginalis is highly contagious bacterial sexually transmitted disease. It causes vaginal fishy odor discharge without itching or irritation as it not penetrates in vaginal walls. There may be associated infection found with this. Tab Metronidazole 400 mg is the best medicine but sexual partner must be treated with otherwise reinfections occur. Please consult your doctor for treatment of both with actual doses and other medication also. Hope this will help you a lot. Thanks for contacting. Have a healthy life ahead. Take care...