Combined oral contraceptives or birth control pills are medications containing two hormones – estrogen and progestin in various combinations, which are close to the natural sex hormones produced in the ovary of each woman. In contraceptive pills it is used estrogen component – ethinyl estradiol and progestin component – levonorgestrel or norethindrone (a synthetic analogue of progesterone). Alesse Birth Control, for example in its composition has ethinyl estradiol and levonorgestrel.
Birth control pills effectiveness is explained by presence of several mechanisms of action.
How Do Combined Birth Control Pills Work?
As an example, Canadian Health&Care Mall will take Alesse Birth Control. This contraceptive performs in the following way:
- suppressing ovulation ( maturation of ovum and egg release);
- contributing to mucus thickening in cervix, making it impenetrable to sperm;
- altering uterine lining, making it impossible for fertilized egg to attach;
- reducing locomotor ability of sperm in fallopian tubes.
- The combination of all these factors makes combined oral birth control pills the most effective method of preventing unwanted pregnancy.