ABSTRACT
There are five varieties of progestogen-only Pill (POP) available (Table 8): four are of the old type that variably inhibit ovulation, while the fifth, CerazetteTM, is a primarily anovulant product. Unless otherwise stated, the abbreviation POP will refer to the four old-type POPs. The latest Faculty Guidance on POPs can be accessed at www.fsrh.org/pdfs/CEUGuidanceProgestogenOnlyPill09.pdf, wherein the references to studies mentioned here can be found.
