Efficacy and Effectiveness
The theoretical efficacy is similar to that of the combined oral contraceptive pill (COCP). However, this pill is taken continuously without any breaks between packets, and traditional progestogen-only pills must be taken to a much stricter time every day (within 3 hours vs. a COCP's 12 hours). However, in some countries, the POP Cerazette has an approved window of 12 hours. The effectiveness is, therefore, dependent upon compliance.
POPs are not dependent upon gut bacterial flora for their absorption and so are not affected by courses of antibiotics. They will, however, be affected by any episodes of diarrhea or vomiting.
Read more about this topic: Progestogen-only Pill
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