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From Mayo Clinic to your inboxSign up for free, and stay up to date on research advancements, health tips and current health topics, like COVID-19, plus expertise on managing health. ErrorEmail field is required ErrorInclude a valid email address Learn more about Mayo Clinic’s use of data.To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and website usage information with other information we have about you. If you are a Mayo Clinic patient, this could include protected health information. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. Birth control pills are a type of contraception that is 99% effective at preventing pregnancy when taken consistently every day. The pill contains hormones that regulate menstruation, lower the risk of ovarian and uterine cancers, improve acne and treat endometriosis. What is birth control?Also known as contraception, birth control prevents pregnancy. You have many different birth control options, including the birth control pill. What is the birth control pill?The birth control pill is a type of contraception that contains hormones that prevent pregnancy. People call it “the pill” because it comes in pill form. Women take the pill orally (by mouth) once a day. The pill is most effective when you take it consistently at the same time each day. How effective is the pill?The pill has the potential to be 99% effective at preventing pregnancy if you take it without fail — meaning you don’t forget to take the pill for even a day or two. However, taking the pill perfectly can be difficult, which is why nine out of 100 women who use the pill will have an unintended pregnancy every year. The pill is most reliable when you take it consistently at the same time each day. Being consistent helps keep hormone levels from fluctuating. How does the birth control pill work?Hormones in birth control pills prevent pregnancy by:
What are the types of birth control pills?There are two different types of birth control pills. Both types contain hormones that prevent pregnancy.
The pill comes in different dosing packets — from 21-day pill packs to 90-day pill packs, to even 365 days of active pills. Traditionally, depending on the brand and dose, you take at least three weeks of active pills followed by two to seven days of hormone-free (inactive) pills. This is called cyclical dosing. Most women have a menstrual period during the inactive pills. Some brands do not provide any inactive pills at all in the pack (they only supply three weeks of active pills). With the 21-day packs a woman does not take any pills for a week. During this time, you’ll have your period, similar to what happens when taking the inactive, hormone-free pills. Some formulations offer continuous dosing, which means you do not have any inactive pills, and a woman takes an active pill daily. Alternatively, extended cycle dosing is when inactive pills or breaks in the active pill regimen only occur three to four times per year. Skipping the inactive pills prevents menstruation. Your healthcare provider can discuss the best option for you. Does the pill prevent sexually transmitted diseases (STDs)?No, the pill won’t protect you against sexually transmitted diseases (STDs) or infections (STIs). STDs, such as genital herpes, chlamydia and human immunodeficiency virus (HIV), are transmitted through direct sexual contact and the exchange of bodily fluids like semen. If you’re sexually active, the best way to prevent an STD is by using condoms in addition to the pill. Condoms, when used alone, are about 85% effective at preventing pregnancy. However if the pill and condoms are used together, both infection and pregnancy prevention is optimized. If you aren’t in a monogamous relationship with one partner, your healthcare provider will suggest using condoms along with the pill to prevent pregnancy and STDs. What are benefits of taking the pill?Some women take the pill for health purposes. The pill can:
Are there any side effects to taking the pill?Some women experience medication side effects when they start taking the pill. These side effects often improve after a couple of months. Tell your healthcare provider if you experience side effects. You may be able to switch to a different brand that doesn’t cause problems. However, simply waiting out the symptoms for a few cycles often help resolve many of the symptoms, especially when first starting a new pill regimen. Potential side effects include:
Are there any health risks to taking the pill?Birth control pills are safe for most women. The pill has been available for 60 years, so there is a lot of comfort and experience with its use. A small percentage of women who take the combination (estrogen-containing) birth control pill have an increased risk for developing these rare complications:
Your doctor will talk to you about your level of risk based on your medical history. Luckily, if an individual is not able to use an estrogen-containing pill, most can still safely take progestin only pills. How soon does the pill work?It can take up to seven days for the pill to become effective in preventing pregnancy. During this time, you should use another form of birth control. If the pill is used to control symptoms such as acne or abnormal bleeding, it can take three to four months to see true benefits. What should I do if I miss a pill?Take the missed pill as soon as you remember. Then take your usual daily dose as planned. You should also use a backup form of birth control until you have your period. Call your healthcare provider if you miss several days of the pill. Your provider can discuss pregnancy test and emergency contraception options. It is helpful to keep the package inserts of the available, most will give specific instructions on what to do if there is a missed pill. Should I avoid certain medications while taking the pill?You should always check with your healthcare provider before taking any new medications or herbal supplements. Certain drugs can make the pill less effective and increase your chances of getting pregnant. These products include:
Can I take the pill while breastfeeding?The combination birth control pill contains estrogen, which can decrease milk production. If you are breastfeeding, your healthcare provider may recommend taking the progestin-only pill instead. However, some women may use estrogen-containing pills once milk supply is fully established, and a woman’s risk of blood clots is minimized. What are alternatives to the pill?If you’re not confident you can remember to take a daily pill, talk to your healthcare provider about these other birth control options:
A note from Cleveland Clinic The birth control pill is a highly effective way to prevent pregnancy when you take it consistently every day. The pill can also lower your risk of certain problems, such as uterine and ovarian cancers, migraines, and acne. Some women experience medication side effects like nausea, though this is usually temporary. You may need to try several different brands of the pill before finding the one that works best for you. Talk to your healthcare provider if you have questions or concerns about the pill. Care at Cleveland Clinic
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How many hours apart should you take birth control pills?While it is best to take one pill every 24 hours, it is also ok to take the pill slightly less or slightly more than 24 hours after you took your last one if you are using the combined pill. However, taking the pill more than five hours late, or missing it entirely, can increase your risk of getting pregnant.
What happens if you don't take birth control everyday?The most common side effect of missing pills is light bleeding or starting your period, which can bring back menstrual cramps. You might feel nauseated as well. Your ovaries are more likely to release an egg when you forget to take multiple pills, raising your risk of accidentally getting pregnant.
How far apart can you take birth control each day?Some doctors recommend using an additional method of birth control for the first cycle (or 3 weeks) to ensure full protection. Follow the advice of your doctor or other health care professional. Try to take the doses no more than 24 hours apart to reduce the possibility of side effects and to prevent pregnancy.
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