While most available methods are effective, the true test of a method's effectiveness for a couple is whether they can accommodate its potential side effects and if consistent and correct use of the method is compatible with their lifestyle.
Most contraceptives are highly effective if used correctly.
The primary factor that lowers the effectiveness of a contraceptive is whether or not it is used correctly and consistently. Other methods such as the IUD, Norplant, or sterilization do not require users to do anything to make sure that the method is used correctly and consistently. In choosing a method, couples should review whether they can accommodate its potential side effects and if consistent and correct use of the particular method is compatible with their life-style. For the most accurate comparison of methods, users should review the perfect use figures given for each method. The higher the effectiveness of a method, the lower the failure rate.