Taking antibiotics is about the only thing I'm aware, I'm sure there is other instances, check with your doc. Needless to say that Birth Control itself is not 100% proof, I got pregnant with my twins while taking the pill
X-rays do not lower the effectiveness of the birth control pill.
No, using two methods of birth control increases effectiveness or leaves effectiveness unchanged.
Antibiotics will completely eliminate the usefulness of a birth control pill. A secondary source, such as condoms, should be used while on antibiotics to continue the prevention of pregnancy. Usually the medical information on the birth control package states which medicines will interfere with the product.
I have also wondered this question and with the research that I have done, it says that neither affects the effectiveness of birth control pills
Yes it may. I have recently read that obesity can affect the effectiveness of birth control.
There are no known drug interactions between fluoxetine (Prozac) and birth control.
There is no combination of birth control that cancels its effectiveness.
No.
Check with your doctor as to the effectiveness of your birth control when used in conjunction with other medications. Reduced effectiveness may be seen in some cases.
The birth control pill reaches its full effectiveness after seven days in a row.
Antibiotics reduce the effectiveness of birth control. You should use a backup method like condoms.
Yes - any medication that you take while on birth control has the option to interfere with its intensity.