What is it? When more than one birth control method is used.
Effectiveness: Usually over 95% effective in typical use.
Price: Cost varies
How do you use it? Some people like to use more than one method together to increase their effectiveness, such as birth control pills and condoms.
How effective is it? To see an estimate of how effective methods are in combination, please take a look here.
Questions? Contact the Sex Sense Line at 604-731-7308 (1-800-739-7367) or www.sexsense.org