Hello and welcome to HCM,
Cerazette is a progesterone
containing oral contraceptive
The OCPs have a monthly schedule and they have to be taken regularly at specified time during the day.
If you are taking the OCP regularly conception will not take place if you have intercourse.
Diarrhea in no way will affect the action of the hormonal preparation.
However, if you have missed your pill more than once, use some other method of contraception
and resume your cycle regularly from next month.
If you have taken antibiotic especially amoxicillin
, an additional contraceptive method has to be used for next 14 days since these antibiotics decrease the action of hormonal preparations.
Thanks and take care
Dr Shailja P Wahal