For girls who weigh more than 198 pounds (90 kilograms), the contraceptive patch may be less effective in preventing pregnancy.
In general, how well each type of birth control method works depends on a lot of things. These include whether a person has any health conditions or is taking any medications that might interfere with the patch. How effective the patch is at preventing pregnancy also depends on whether the method chosen is convenient — and whether the person remembers to use it correctly all the time.