Can you eat cereal an hour after taking flagyl?

Yes. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV vaccine. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines

Extended release flagyl should be taken 1 hour before or 2 hours after eating. So, yes, the cereal one hour after taking flagyl was fine. On the other hand, alcohol should be avoided entirely while taking flagyl.