When used correctly, birth control pills are theoretically 99.7% effective. With that said, anecdotes from friends and family about their experiences with birth control can be enough to convince many of the non effectiveness of oral contraceptive.
Unfortunately, though, many individuals make mistakes or use their medication improperly.
Therefore, the failure rate can be as high as 9 in 100 women due to inconsistent or incorrect use. It’s essential for women to take their birth control pills regularly, as inconsistent usage and/or missing pills can increase the risk of pregnancy. This is especially true for missing pills in the first or last week of a pack, as most birth control products include a medication-free period of one week for every month and missing doses near the end or beginning of a cycle can extend the length of this period, increasing the risk of failure.
You may have heard that being overweight can make the birth control pill less effective. This may not apply to the birth control pill, however, women who weigh more than 90 kg and use the contraceptive patch rather than the pill may be at risk of an unplanned pregnancy.

Overall, oral contraceptives are considered safe and effective, however proper and consistent use is key to ensuring that they work effectively – as always, consult a healthcare provider when starting any new medications. Second, the use of barrier methods (eg. condoms) is still highly recommended, not only because they act as a reliable backup method, but because they also protect both men and women against sexually transmitted infections, which birth control medications do not protect against.
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