The birth control patch, sold under the brand name Ortho Evra, is made by Ortho-McNeil Pharmaceutical, Inc. It contains progestin and estrogen, which are the same hormones found in birth control pills.
Most women decide to use permanent contraception to avoid the continuous use of temporary options, which often carry side effects and risks related to synthetic hormones like estrogen and progestin.
Monophasic pills don't change the levels of progestin and estrogen that you receive throughout the course of a month, except for during the use of the placebo pills at the end of each packet.
Biphasic oral contraceptives use a constant amount of estrogen during the full cycle, but the amount of progestin is lower during the first half of the cycle and increases in the second half.
From these glands come a flood of sex hormones-androgen and testosterone in the male, estrogen and progestin in the female-that regulate the growth and function of the sex organs.
This type of pill is good for women who are sensitive to estrogen, over the age of 35, or who are breastfeeding, as progestin does not interfere with milk production.
Some people think that a low-dose pill can reduce the risk of depression or mood swings, but it's the progestin in the pills that seems to cause emotional side effects.
If you suffer from painful headaches or migraines associated with your cycle each month, choose a pill that features low estrogen and low progestin, such as Alesse.
Combined Pills: Combined emergency contraceptive pills contain both estrogen and progestin and are effective at preventing pregnancy in about 75 percent of women.
Progestin-Only Pills: These pills contain a type of progestin hormone called levonorgestrel, and they help prevent pregnancy in approximately 89 percent of cases.