Mircette birth control pill utilizes both progesterone and estrogen to prevent unwanted pregnancy. The synthetic hormones used are Desogestrel, progesterone, and ethil estradiol, an estrogine. Desogestril has lover androgen (male hormone) levels and is reported to hanve a greater effect in inhibiting ovulation than levonorgestrel. Ethinyl estrdiol advantage is that it is absorbed quickly and last in the body longer.

Mircette 28 is a combination, monophasic birth control pill. Combination birth control pills work by inhibiting ovulation, thining the uterine walls and thicken the mucus on the cervical walls. Estrogen in Mircette inhibits ovulation while the progesterone effects the changes in the uterus.

Combination birth control pills (those with progesterone and estrogine) are usually more effective than single ingredient oral contraceptive pills. The combination birth control pills have either non-changing doses of hormones (monophasic) or varying levels of hormones (multiphasic)

Multiphasic oral contraceptive pills come in two types, Biphasic and triphasic. In both the estrogine levels remain the same but the progesterone levels vary in strength. Biphasic birth control pills like Mircette, change progeterone hormone levels twice during the 28 day pack and triphasic contraceptive like Ortho Tri-Cyclen, change the strength of progesterone 3 times during the 28 day pack.

In all cases the last 7 days have no hormones and are provided to maintain the habit of taking pills every day.

Monophasic pills maintain the same levels of hormones for 21 days with the last 7 being “filler” pills.

There aren’t significant differences regarding effectiveness between monophasic and multiphasic pills. The differnt hormone level and varying hormone levels are to accomodate the difference in women and to help manage side effects.

Deciding on the type requires consulting a doctor. It’s is possible for someone to go through a few different brands before they find the one that works best for them.