In addition to oral contraceptives (birth control pills) women can also choose a transdermal patch or a vaginal ring. All of these result in effective prevention of pregnancy as well as cycle control. Depo provera is an injection administered every 3 months and usually results in no monthly periods. Mirena and paraguard are intrauterine devices (iud) that provide long term contraception but is reversible upon removal. Barrier methods for contraception include condoms, diaphragms, and spermicides.