Who Makes It?
Kelnor is made by Barr Pharmaceuticals. Technically, Kelnor is a generic version of Demulen®
, a birth control pill that is no longer available (see Generic Kelnor for more information)
How Does Kelnor Work?
Kelnor is a "combined" oral contraceptive, which means that it contains two different types of hormones. It contains both an estrogen (ethinyl estradiol) and a progestin (ethynodiol diacetate). Combined oral contraceptives are the most common type of birth control pill used today. Generally, they are more effective than progestin-only birth control pills.
The hormones in Kelnor prevent pregnancy primarily by stopping ovulation (the maturation and release of eggs from the ovaries). However, the medication also works to prevent pregnancy in two other, minor ways. It changes the cervical mucus (the fluid of the cervix, which is the lower, narrow part of the uterus that is connected to the vagina), making it more difficult for sperm to enter the uterus. It also alters the lining of the uterus (the endometrium), making it less receptive to an embryo.