Several birth control methods use hormones to prevent pregnancy, including the pill, the patch, the vaginal ring, the shot, the implant, and hormonal IUDs. These methods all work by delivering synthetic versions of estrogen, progesterone, or both into your body to stop ovulation and make it harder for sperm to reach an egg. Non-hormonal options like the copper IUD, condoms, and barrier methods work differently and contain no hormones at all.
How Hormonal Birth Control Prevents Pregnancy
All hormonal methods share the same core strategy. They suppress the development of egg follicles in the ovaries, which prevents ovulation. No egg release means no pregnancy. As a second line of defense, these hormones thicken the cervical mucus, creating a barrier that makes it much harder for sperm to pass through the cervix. Some lower-dose methods also thin the uterine lining, which could theoretically affect implantation.
The hormones used fall into two categories. Combined methods contain both estrogen and a progestin (a synthetic form of progesterone). Progestin-only methods skip the estrogen entirely. This distinction matters because estrogen is the component linked to most of the serious risks, like blood clots. People who can’t safely take estrogen, such as those with a history of clotting disorders, can often still use a progestin-only option.
The Pill
Oral contraceptives are the most widely recognized hormonal method, and they come in two types. The combination pill contains both estrogen and progestin, typically with 10 to 35 micrograms of estrogen per pill. You take it daily, usually for 21 active days followed by 7 inactive days (or in extended-cycle versions, for 3 months straight before a break). The mini-pill contains only progestin and is taken every day with no breaks.
One progestin-only pill is now available over the counter in the United States, making it the first birth control pill you can buy without a prescription. Combination pills still require a prescription. With typical use, both types have about a 9% failure rate in the first year, meaning 9 out of 100 people will get pregnant. With perfect use (taking it at the same time every day, never missing a dose), that drops to 0.3%.
The Patch
The patch is a small adhesive square you stick to your skin on your lower abdomen, buttocks, upper arm, or upper back. It delivers a combination of estrogen and progestin through the skin. You wear one patch for a week, replace it for three consecutive weeks, then go patch-free for a week. Its effectiveness mirrors the pill: 9% failure rate with typical use, 0.3% with perfect use. The main advantage is that you only have to think about it once a week rather than every day.
The Vaginal Ring
The ring is a flexible, roughly 2-inch device you insert into the vagina, where it releases a steady dose of estrogen and progestin. You leave it in place for three weeks, remove it for one week, then start a new one. Like the pill and patch, it has a 9% typical-use failure rate and 0.3% with perfect use. Some people prefer it because there’s nothing to remember daily or weekly once it’s placed.
The Shot
The contraceptive injection is a progestin-only method given every 3 months (13 weeks) by a healthcare provider, either into a muscle or under the skin. You have a 2-week grace period if you’re late for your next shot, meaning you’re still protected up to 15 weeks from the last injection without needing backup contraception. The shot is more effective than methods that depend on daily or weekly habits: 6% failure rate with typical use and 0.2% with perfect use.
The Implant
The implant is a thin, matchstick-sized rod placed under the skin of your upper arm during a quick office procedure. It releases a low, steady dose of progestin and lasts up to 3 years. This is the most effective hormonal method available, with a failure rate of just 0.05% for both typical and perfect use. Because there’s nothing to remember, forget, or misuse, there’s essentially no gap between how well it works in ideal conditions and real life.
Hormonal IUDs
A hormonal IUD is a small, T-shaped device placed inside the uterus by a healthcare provider. It releases progestin locally, meaning most of the hormone stays in the uterus rather than circulating throughout your body. Several brands exist with varying hormone levels and lifespans:
- Mirena and Liletta contain the highest hormone dose (52 mg) and are approved for up to 5 years.
- Kyleena has a lower dose (19.5 mg) and also lasts up to 5 years.
- Skyla has the lowest dose (13.5 mg) and lasts up to 3 years.
All hormonal IUDs are extremely effective, with a 0.2% failure rate regardless of whether you measure typical or perfect use. Like the implant, there’s no user error involved once it’s in place. Many people also experience lighter periods or lose their period entirely while using a hormonal IUD, which can be a significant benefit for those with heavy or painful cycles.
Benefits Beyond Pregnancy Prevention
Hormonal birth control does more than prevent pregnancy. These methods regulate menstrual cycles, reduce PMS symptoms, and can treat conditions like endometriosis, uterine fibroids, and polycystic ovary syndrome (PCOS). They also clear acne, reduce unwanted hair growth, and lower the risk of ovarian, uterine, and colon cancers. For many people, these secondary benefits are a major reason for choosing a hormonal method even when pregnancy prevention isn’t the primary concern.
Common Side Effects
The most frequently reported side effects of hormonal contraceptives include nausea, breast tenderness or swelling, spotting between periods, and mood changes like irritability. These tend to be most noticeable in the first few months and often improve as your body adjusts. Estrogen-containing methods carry a small but real increased risk of blood clots, which is why people with a history of deep vein thrombosis, pulmonary embolism, or certain clotting disorders are typically advised to use progestin-only options instead.
Fertility After Stopping
A common concern is whether hormonal birth control affects long-term fertility. It doesn’t. About 83% of people become pregnant within 12 months of stopping any hormonal method, which is comparable to the general population’s conception rate. The type of hormone, the specific method, and how long you used it don’t significantly change this number.
That said, some methods clear the body faster than others. Former pill users have the highest 12-month pregnancy rate at about 87%, while former injection users come in around 78% and former implant users around 75%. These differences likely reflect how long the hormones take to fully leave your system rather than any lasting impact on fertility. The injectable can take several months to clear, so if you’re planning to get pregnant in the near future, that’s worth factoring into your timing.
How to Choose
The best hormonal method depends on what fits your life. If you don’t want to think about birth control daily or weekly, a long-acting option like the implant or an IUD offers the highest effectiveness with zero maintenance. If you prefer something you can start and stop easily, the pill, patch, or ring gives you that flexibility, though they require more consistency to work well. If you can’t use estrogen, progestin-only options include the mini-pill, the shot, the implant, and all hormonal IUDs.
The gap between typical-use and perfect-use failure rates tells an important story. For the pill, patch, and ring, that gap is large (0.3% vs. 9%) because real life involves missed pills, late patches, and forgotten rings. For the implant and IUD, the gap is essentially zero. Choosing a method you’ll actually use consistently matters more than choosing the one that looks best on paper.