There are three types of combined hormonal contraception (CHC) currently available - the combined oral contraceptive (COC) pill, the contraceptive transdermal patch and the contraceptive vaginal ring. These contraceptive methods contain both oestrogen and progestogen.
This is a companion discussion topic for the original article at https://patient.info/doctor/fertility/combined-hormonal-contraception-pill-patch-vaginal-ring