<s>[INST] hello there.. i have been using ornidazol tablets for a dental infection for 3 days now. i d like to ask you, does ornidazol causes abnormal vaginal bleeding? (its not my period but  ive seen brown spots in the toilette and also on my lingerie yesterday and today) [/INST] Thanks for using Chat Doctor. Read your query. It is not mentioned in your whether you are taking the ornidazole tablet with your dentist advice. Ornidazole is usually not the first line of treatment in dentistry, unless it is a must for the dentist. Please consult the dentist if you are taking for dental infection. Abnormal vaginal bleeding is not the side effect of this medicine, though it may cause nausea, vomiting and abdominal discomfort. For vaginal bleeding or spotting, please visit your gynecologist. Hope this satisfies your query. Thanks and regards. </s>