Hi, Thanks for using HCM.
Few antibiotics cause suppression of intestinal microflora, there by reducing OC pills blood level. making them ineffective.
If more than 2 tablets are missed better to fallow alternative method of contraception
like barrier method, you can start the next course in once your next cycle starts with new pack.
Hope I answered your question. Feel free to ask me if you have any further queries.
Wish you good health. Take