Birth control is any method, device, or medication used to prevent pregnancy. Options range from daily pills and barrier methods like condoms to long-lasting devices that work for years without any effort on your part. Some methods use hormones to stop ovulation, others physically block sperm, and a few are permanent. Understanding how each category works makes it easier to find the right fit for your body and your life.
How Birth Control Prevents Pregnancy
Most hormonal birth control works through one or more of three mechanisms: it stops your ovaries from releasing an egg each month, it thickens the mucus at the cervix so sperm can’t reach an egg, or it thins the lining of the uterus. Some methods rely on just one of these, while others combine all three for higher reliability.
Non-hormonal methods take a different approach. Barrier methods like condoms and diaphragms physically block sperm from reaching the egg. The copper IUD creates a chemical environment inside the uterus that’s toxic to sperm. Fertility awareness methods rely on tracking your cycle and avoiding sex (or using barriers) during the roughly nine or more fertile days each month.
Hormonal Methods
The Pill, Patch, and Ring
The combined pill, the patch, and the vaginal ring all deliver a mix of estrogen and progestin. They have identical typical-use effectiveness: about 91% in real life (9 out of 100 people get pregnant in the first year), rising to 99.7% with perfect use. The difference between those numbers comes down to human error, like forgetting a pill or replacing a patch late. The pill is taken daily, the patch is changed weekly, and the ring stays in place for three weeks at a time.
In 2024, the first over-the-counter birth control pill, Opill, became available in pharmacies, grocery stores, and online without a prescription. It’s a progestin-only pill, meaning it doesn’t contain estrogen. A one-month supply costs about $20, and a three-month supply runs around $50.
The Shot
The birth control shot is a progestin injection given every three months. With typical use, about 6 out of 100 people become pregnant in the first year. With perfect use (getting the shot on schedule every time), that drops to 0.2%. It’s a good option if you don’t want to think about birth control daily or weekly, but it does require regular clinic visits.
The Implant
The contraceptive implant is a small, flexible rod placed just under the skin of your upper arm. It steadily releases a low dose of progestin and lasts up to three years. It’s one of the most effective methods available, with a failure rate well under 1%. Once it’s placed, there’s nothing to remember, replace, or refill until it’s time for removal.
Hormonal IUDs
Hormonal intrauterine devices are small T-shaped devices placed inside the uterus by a healthcare provider. Several versions exist, differing in hormone dose, frame size, and how long they last. Some are approved for up to five years, others for three. They release a small amount of progestin locally, which thickens cervical mucus and thins the uterine lining. Their cumulative pregnancy rate is roughly 0.3 per 100 women per year, making them among the most reliable options available.
Non-Hormonal Methods
Copper IUD
The copper IUD is a hormone-free device placed in the uterus that lasts up to 10 years. It works by releasing copper ions that are toxic to sperm. The typical-use failure rate is just 0.8%, and it doubles as the most effective form of emergency contraception when inserted within five days of unprotected sex, preventing over 99% of pregnancies in that scenario.
Condoms
External (male) condoms have a typical-use failure rate of about 13%, while internal (female) condoms sit at around 21%. That gap between typical and perfect use is significant: with perfect use, external condoms drop to a 2% failure rate. Condoms are the only birth control method that also protects against sexually transmitted infections. Latex condoms block HIV and other STIs, though lambskin condoms do not.
Other Barrier Methods
Diaphragms and cervical caps are inserted before sex along with spermicide. The diaphragm has a typical-use failure rate of about 12%, while the cervical cap is closer to 22%. The contraceptive sponge, which contains spermicide and fits over the cervix, fails about 17% of the time with typical use and can be left in place for up to 24 hours. Spermicides used alone (foams, gels, films, or suppositories) have a 21% typical-use failure rate, so they’re most effective when paired with another barrier method.
Fertility Awareness
Fertility awareness-based methods involve tracking your menstrual cycle to identify fertile days, then either abstaining from sex or using barriers during that window. Effectiveness varies widely depending on the specific technique and how consistently you follow it: typical-use failure rates range from 2% to 23%. These methods require discipline and regular cycles to work well.
Emergency Contraception
Emergency contraception is a backup option used after unprotected sex, not a primary method. It can prevent up to 95% of pregnancies when used within five days. The most common pill-based option contains levonorgestrel and results in pregnancy rates of about 1.2% to 2.1%. A prescription alternative containing ulipristal acetate has a similar pregnancy rate of about 1.2% but is more effective than other pills in the 72-to-120-hour window. The copper IUD, when inserted within five days, is the most effective emergency option at over 99%.
Permanent Birth Control
For people who are certain they don’t want future pregnancies, sterilization is an option. Both vasectomy and tubal ligation are over 99% effective.
A vasectomy is done in a doctor’s office under local anesthesia and has a shorter recovery time. Risks are minimal: some pain, minor bleeding, infection, or rarely, failure. Tubal ligation is a more involved procedure requiring general anesthesia and a small incision in the abdomen. While still considered minor surgery, it carries slightly higher risks, including potential injury to nearby organs and a small chance of ectopic pregnancy if the tubes don’t close completely.
Health Benefits Beyond Pregnancy Prevention
Hormonal birth control is frequently prescribed for reasons that have nothing to do with preventing pregnancy. The pill regulates irregular cycles and reduces period pain by lowering the natural chemicals that make the uterus contract. For people with very heavy periods, certain hormonal IUDs are FDA-approved to treat heavy bleeding by keeping the uterine lining thin throughout the cycle.
Birth control pills also treat acne by lowering testosterone levels, and specific formulations are FDA-approved for premenstrual dysphoric disorder (PMDD), a severe form of PMS that causes mood swings, breast tenderness, and bloating. For people with polycystic ovarian syndrome (PCOS), the pill helps regulate hormones, control periods, and reduce the acne and excess hair growth that often accompany the condition. The birth control shot is FDA-approved to treat pain from endometriosis, a condition where tissue similar to the uterine lining grows elsewhere in the pelvis. Taking pills continuously (skipping the placebo week) is also a well-recognized treatment for menstrual migraines, since it eliminates the estrogen fluctuations that trigger them.
Blood Clot Risk With Hormonal Methods
Combined hormonal methods (those with both estrogen and progestin) carry a small increased risk of blood clots. Among non-users, blood clots occur in about 1 to 5 out of every 10,000 women per year. Among users of combined hormonal contraceptives, that rises to roughly 3 to 15 per 10,000 women per year. For context, pregnancy itself carries a much higher risk: 5 to 20 per 10,000 women per year, and the postpartum period jumps to 40 to 65 per 10,000. The risk is real but small in absolute terms, and it’s highest in the first year of use. Progestin-only methods (the mini-pill, implant, hormonal IUD, and shot) do not carry this same elevated clot risk.
Choosing the Right Method
The best method is one you’ll actually use consistently. A pill that’s 99.7% effective with perfect use drops to 91% in real life if you forget doses regularly. That’s why long-acting methods like IUDs and the implant have the smallest gap between perfect and typical effectiveness: once they’re in place, there’s no daily or weekly action required.
Your health history matters too. People who smoke, get migraines with aura, or have a history of blood clots are generally steered away from methods containing estrogen. Whether you want children in the future, how soon, how many sexual partners you have, and whether STI protection matters to you all shape which options make the most sense. Cost, convenience, and how you feel about hormones are equally valid considerations. There’s no single best birth control, only the one that fits your body, your health, and your daily life.