What is considered a birth control mini-pill and how does it differ from other birth control pills?

the mini pill only contains progestin, while the other pills contain both estrogen and progestin.

A popular mini pill brand is Micronor. Women with high blood pressure or predisposition to heart attacks and the like are usually prescribed the mini pill. Another major difference between POPs and Combination Pills is that the mini pill does not include a week of placebo pills; each mini pill contains the same dosage of progestin and must be taken continuously around the same time each day. If you are even three hours late taking the mini pill, your chances for pregnancy are drastically increased. In cases like that, it is recommended you use a back-up method in addition to continuing your pill regimin for at least 5 days. Taking combination pills at EXACTLY the same time each day is not as crucial.