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Demulen 1/35

There are two different strengths of Demulen® (ethynodiol diacetate/ethinyl estradiol) -- Demulen 1/35 and Demulen 1/50. However, brand-name Demulen is no longer available in the United States, as it was discontinued by its manufacturer.
There are currently two generic versions of this birth control pill (sold under the names Zovia® and Kelnor™) available. If your healthcare provider writes you a prescription for Demulen, your pharmacist will automatically substitute one of the generic versions.
Demulen 1/50 (but not Demulen 1/35) contains more estrogen than most birth control pills that are currently available. You should only take Demulen 1/50 if your healthcare provider thinks that it is the best choice for your situation, as this high-estrogen dose can cause potentially serious problems (such as blood clots and strokes).
Demulen works to prevent pregnancy by stopping ovulation, changing the cervical mucus (making it more difficult for sperm to enter the uterus), and altering the lining of the uterus (making it less receptive to an embryo).
(Click Demulen for a complete look at Demulen 1/35. This article covers potential side effects, explains who may not be able to safely use this pill, and offers general dosing guidelines.)
Last reviewed by: Kristi Monson, PharmD
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