Etynodiol diacetate

Etynodiol diacetate is a synthetic form of progesterone, a type of female hormone. It is a prodrug of norethisterone, and is used primarily in contraceptive medications. Etynodiol diacetate works by preventing ovulation (the release of an egg from an ovary) and causing changes in the cervical mucus and uterine lining, making it harder for sperm to reach the uterus and harder for a fertilized egg to attach to the uterus.

Medical Uses

Etynodiol diacetate is used in several combined oral contraceptive pills in combination with an estrogen such as ethinylestradiol. It is known for its effectiveness in preventing pregnancy and is sometimes prescribed for other medical conditions under the guidance of a healthcare provider.

Pharmacology

Mechanism of Action

As a prodrug of norethisterone, etynodiol diacetate is converted in the liver to its active form, norethisterone. This active form then exerts its effects by binding to and activating progesterone receptors in the body, which plays a key role in regulating the menstrual cycle and pregnancy. It inhibits gonadotropin secretion, preventing ovulation, and alters the cervical mucus and uterine lining.

Pharmacokinetics

After oral administration, etynodiol diacetate is rapidly absorbed and converted into norethisterone. Its bioavailability and pharmacokinetic profile can be influenced by various factors, including the presence of food and other medications.

Side Effects

Like all medications, etynodiol diacetate can cause side effects, although not everyone experiences them. Common side effects include nausea, headache, breast tenderness, and mood changes. Serious side effects are rare but can include blood clots, stroke, and liver problems. Patients are advised to discuss the potential risks and benefits of etynodiol diacetate with their healthcare provider.

Contraindications

Etynodiol diacetate is contraindicated in individuals with a history of thrombotic disorders, certain types of cancers, unexplained vaginal bleeding, liver disease, or known hypersensitivity to the medication. It is also not recommended for use during pregnancy.

Interactions

Etynodiol diacetate can interact with other medications, which can affect its efficacy and increase the risk of side effects. These include drugs that induce liver enzymes, such as certain anticonvulsants and antibiotics. Patients should inform their healthcare provider of all medications they are taking to avoid potential interactions.

See Also

• Oral contraceptive pill
• Progesterone
• Norethisterone
• Estrogen

• 
  Norethisterone structure
• 
  Ethynodiol diacetate synthesis