If birth control is used perfectly, it can be 99% effective. Perfect use means that the birth control is used every day at the same time, without any exception. Typical use is how it is most commonly used. It means that the pill is taken at different times or a day is accidentally missed. Birth control, when it is typically used is 91% effective.
Despite high percentages, it is still possible to get pregnant. In U.S between 3 and 9 percent of women become pregnant every year while using pill. It is almost always the result of missing one or more pills several days in a row, when the supply of hormones isn’t constant so you may begin ovulating. Therefore, we can say that the women are failing the pill, not the pill failing the women. During this time the unprotected sex is not recommended, if you want to decrease changes of becoming pregnant.
There is no solid evidence that using alcohol or taking expired pills can have impacts on the pill’s ability to distribute hormones throughout the woman’s body.
There are 4 most common things that reduce birth control effectiveness:-
Skipping Pills: The birth control pills are hormonal contraceptives and they are suppressing hormones in a woman’s body, so the woman can normally trigger and regulate ovulation. These pills are mostly the combination of hormones progestin and estrogen. Skipping a pill can cause dropping of the hormone levels. There is a study where 50% of the participants skipped one of more pills in a row, but only 18% avoided sex in the following week and a 3% used a back – up method.
Taking Birth Control pill in different time: Scientists made contraceptives safer and reduced bad effects by lowering hormonal doses. That means it is very important to take birth control pills at the same time every day. Progesterone – estrogen pills get you a window of 6 – 12 hours. While progesterone pills have to be more consistent.
Taking certain medications: There are uncommon medications that can impinge the birth control pill’s effectiveness. There are included Rifadin (it is used for treating tuberculosis), Griseofulvin (anti-fungal drug), some HIV protease inhibitor and Dilantin, Mysoline, Tegretol and Phenobarbital (anticonvulsants). All of these medications speed up metabolism in your liver and the rate at which the birth control pill’s hormones can be broken down. These drugs can hae impacts on oral contraceptives, but if you are HIV – positive or you suffer from seizures or recently contracted serial fungal infection or tuberculosis, speak with the doctor about whether your medication falls into this category. Anti fungal treatments and common antibiotics do not have any impact on how well this pill works.
Using herbal dietary supplements like St. John’s Wort: This supplement can affect the birth control pill if you take it in high doses regularly. Like medications mentioned before, they can speed up liver metabolism. One study says that the woman who takes 300 milligrams of St. John’s wort 3 times a day will be more likely to have break through bleeding. The National Institutes of Health recommends using some back – up birth control method for a woman who is taking St. John’s wort and is on the pill.