Find patient medical information for Flagyl Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. People taking Flagyl are often instructed to avoid consuming alcohol while using the medication and for one day after finishing the course of antibiotics --- three days if you're taking oral capsules. Pictures of Flagyl (Metronidazole), drug imprint information, side effects for the patient. Flagyl (metronidazole) is an antibiotic prescribed to treat various parasitic and bacterial infections (Giardia, C. diff, H. pylori). Common side effects are headaches, nausea, and metallic taste in the mouth. Pregnancy and breastfeeding safety information are provided. I had been taking Flagyl for only a week and the effects were very powerful. However, I did experience some side effects such as nausea and dizziness. A side-effect of Keflex is diarrhea, so avoid foods that will make runny stools worse, such as coffee, greasy or processed foods, dairy products and vegetables associated with flatulence such as broccoli, cabbage and peppers. Find a comprehensive guide to possible side effects including common and rare side effects when taking Flagyl (Metronidazole) for healthcare professionals and consumers. It has long been thought of that consuming alcohol while taking Flagyl causes adverse reactions in the body. However, this popular notion of Flagyl and alcohol interaction is being debunked by recent researches. Flaygl is the common trade name of a drug called Metronidazole. It is suggested for several conditions but is often used to treat c.difficile. Takhzyro (lanadelumab-flyo) is a monoclonal antibody that works by reducing the activity of an enzyme that is uncontrolled in people with hereditary angioedema (a rare genetic immune system disorder).