What birth control is and why people use it
Birth control is any method that prevents pregnancy. It works by stopping sperm from reaching an egg, preventing ovulation (the release of an egg), or changing the uterus so a fertilized egg cannot implant. People use birth control for many reasons: to space pregnancies apart, to prevent pregnancy while pursuing education or career goals, to manage health conditions, or straightforward because they do not want children.
Birth control methods vary widely in how they work, how often you use them, how much they cost, and how well they prevent pregnancy. Some require a prescription or a visit to a doctor. Others you can buy at a pharmacy or grocery store. Some work for years without you thinking about them. Others require action every single time you have sex. Understanding what exists and how each method works helps you figure out what might fit your life.
Key Takeaways
- Birth control methods fall into several categories: barrier methods (condoms, diaphragms), hormonal methods (pills, patches, shots, implants), intrauterine devices (IUDs), and permanent methods (sterilization).
- Hormonal birth control prevents pregnancy by stopping ovulation or thickening cervical mucus, while barrier methods physically block sperm from reaching an egg.
- Effectiveness varies by method and by how consistently you use it — some methods like IUDs and implants are over 99 percent effective because they require no daily action, while pills are effective only if taken on schedule.
- Most birth control methods do not protect against sexually transmitted infections; condoms are the primary method that does both.
- Cost, side effects, and convenience differ significantly between methods, so what works for one person may not work for another.
Barrier methods: condoms, diaphragms, and cervical caps
Barrier methods physically block sperm from reaching an egg. Condoms are the most common and are available without a prescription at pharmacies, grocery stores, and online. They come in latex, polyisoprene (plastic), and polyurethane versions. Condoms are the only birth control method that also protects against sexually transmitted infections. They are about 87 percent effective with typical use because they can slip, tear, or be put on incorrectly.
Other barrier methods include diaphragms and cervical caps, which are dome-shaped devices that fit over the cervix and block sperm. Both require a prescription and a fitting appointment with a doctor or nurse to may support the correct size. They must be used with spermicide (a chemical that kills sperm) and inserted before sex. They are about 88 percent effective with typical use. These methods are less common now than they were decades ago, but some people prefer them because they have no hormones and can be used only when needed.
Hormonal methods: pills, patches, shots, and rings
Hormonal birth control uses hormones to prevent pregnancy by stopping ovulation or by thickening cervical mucus so sperm cannot reach an egg. The most common is the birth control pill, which contains hormones and must be taken by mouth every day. Pills come in different hormone combinations and doses, so if one causes side effects, another might not. Pills are about 91 percent effective with typical use because missing doses or taking them at different times each day reduces effectiveness.
Other hormonal methods work similarly but require less frequent action. The birth control patch is a small sticker worn on the skin that releases hormones; you change it once a week for three weeks, then take one week off. The birth control shot (Depo-Provera) is an injection given every three months at a doctor's office or clinic. The birth control ring (NuvaRing) is a flexible ring inserted into the vagina that releases hormones; you wear it for three weeks, remove it for one week, then insert a new one. All three are about 91 percent effective with typical use, though the shot is closer to 97 percent because you do not have to remember to use it between appointments.
Long-acting methods: IUDs and implants
Intrauterine devices (IUDs) are small T-shaped devices inserted into the uterus by a doctor or nurse. They come in two types: copper IUDs (which create an environment toxic to sperm) and hormonal IUDs (which release a small amount of hormone into the uterus). Copper IUDs last 10 years; hormonal IUDs last 3 to 7 years depending on the brand. IUDs are over 99 percent effective because once inserted, there is nothing to remember or do. Insertion can be uncomfortable, and some people experience cramping or heavier periods afterward, though hormonal IUDs often make periods lighter.
A birth control implant is a thin plastic rod about the size of a matchstick inserted under the skin of the upper arm by a doctor. It releases hormones and lasts three years. Like IUDs, implants are over 99 percent effective and require no action once in place. Insertion takes a few minutes and leaves a small mark. Both IUDs and implants can be removed at any time if you want to become pregnant or switch methods.
Permanent methods: sterilization
Sterilization is a surgical procedure intended to be permanent. For people with a uterus, tubal ligation involves tying, cutting, or blocking the fallopian tubes so eggs cannot reach the uterus. For people with testicles, vasectomy involves cutting or blocking the vas deferens so sperm cannot leave the body. Both procedures are over 99 percent effective and require no ongoing action. Both can sometimes be reversed, but reversal is not may provide and is expensive, so these methods should be chosen only if you are certain you do not want children in the future.
Sterilization procedures are performed in an outpatient surgery center or hospital. Recovery takes a few days to a few weeks depending on the procedure. Some people choose sterilization because they do not want to use birth control for decades, while others choose it because they have completed their family and want a permanent solution.
How to think about effectiveness and side effects
Birth control effectiveness is measured two ways: perfect use (the method used exactly as directed every single time) and typical use (how people actually use it in real life, including missed doses or incorrect process). The difference matters. Pills are 99 percent effective with perfect use but 91 percent with typical use because people forget doses or take them at different times. IUDs and implants are over 99 percent effective both ways because they do not depend on remembering anything.
Side effects vary by method and by person. Hormonal methods can cause nausea, headaches, breast tenderness, mood changes, or changes in sex drive — some people experience none of these, others experience several. Barrier methods have few side effects but require action every time. IUDs can cause cramping or heavier periods (though hormonal IUDs often improve this). Sterilization is permanent, so the main "side effect" is that you cannot become pregnant. If a method causes side effects you dislike, switching to a different method is usually possible.
Cost and where to get birth control
Cost varies widely. Condoms cost a few dollars per box and are available at any pharmacy or grocery store without a prescription. Birth control pills typically cost $20 to $50 per month without insurance, though many insurance plans cover them fully. IUDs and implants cost $500 to $1,300 upfront but last for years, making them cheaper over time than pills. Sterilization procedures cost $1,000 to $5,000 depending on the type and location.
You can get birth control from several places. Condoms and spermicide are available at pharmacies and online without a prescription. Pills, patches, shots, and rings require a prescription from a doctor, nurse practitioner, or physician assistant. IUDs and implants must be inserted by a healthcare provider. Sterilization must be performed by a surgeon. Many community health centers, Planned Parenthood clinics, and county health departments offer birth control at reduced cost based on income. Some states and insurance plans cover birth control fully, while others require a copay.
Frequently Asked Questions
Does birth control protect against sexually transmitted infections?
Only condoms protect against sexually transmitted infections. All other birth control methods prevent pregnancy but not infections. If you are not in a monogamous relationship with a partner who has tested negative for infections, using condoms along with another birth control method offers both pregnancy prevention and infection protection.
Can I switch birth control methods whenever I want?
Yes. You can stop taking pills anytime, though some people experience spotting or cramping for a few days. You can have an IUD or implant removed anytime, and fertility typically returns within a few weeks. If you want to switch from one method to another, a doctor or nurse can advise on timing to avoid gaps in protection.
What if I want to become pregnant after using birth control?
Fertility returns quickly after stopping most birth control methods. After stopping pills, patches, or rings, you can become pregnant as soon as you ovulate again, usually within a few weeks. After an IUD or implant removal, fertility typically returns within a month. After sterilization, reversal is possible but not may provide and requires surgery.
Do I need a pelvic exam to get birth control pills?
Requirements vary by state and provider. Some doctors require an exam; others do not. Some states allow nurse practitioners or physician assistants to prescribe pills without an exam. Telehealth providers in some states can prescribe pills after a phone or video consultation. If you prefer not to have an exam, ask your provider whether it is required or whether other options exist.
What happens if a condom breaks?
If a condom breaks during sex, you can take emergency contraception (a pill taken within 72 hours that prevents pregnancy) to reduce the risk of pregnancy. You should also get tested for sexually transmitted infections. Emergency contraception is available at pharmacies without a prescription in most states.