Most oral contraceptives contain a combination of estrogen and progestin. These pills are somewhat more effective than progestin-only mini-pills (although the mini-pills are 91 percent effective if used correctly). Mini-pills are a good option if you are unable to take an estrogen-containing pill or are bothered by estrogen-related side effects such as headaches. Progesterone-only pills are appropriate for older women, especially smokers who want to use an oral hormonal contraceptive method, and postpartum and/or breast-feeding women. Another progestin-only alternative is the long-acting contraceptive injection Depo-Provera, which is reversible, highly reliable and more convenient for some women than taking a daily pill. A type of intrauterine device (IUD) called Mirena also provides long-acting, reversible contraception in part by releasing progestin directly into the uterine lining. Discuss the options with your health care provider to decide what's best for you.