Hormonal preparations for maintaining pregnancy

Mechanism of action and main effects

Pharmacological support for patients with threatened miscarriage is based on the use of specialized hormonal agents. The main objective of such therapy is the medical suppression of excessive activity of the uterine muscular layer.

Drugs of this group purposefully cause a reduction in myometrial excitability and contractility. This therapeutic effect is achieved through a specific pharmacodynamic mechanism: the active components of the drugs provide a pronounced attenuation of the physiological effects of oxytocin. Since oxytocin is a potent natural stimulator of uterine contractions, suppressing its influence makes it possible to relieve hypertonus and prevent the premature expulsion of the gestational sac or fetus.

Combined oral agents

This group includes the combination of ethinyl estradiol and acetomepregenol. This fixed combination of active substances is widely used in gynecological and obstetrical practice.

Dosage form: The drug is produced in a solid dosage form—these are tablets intended for oral administration (oral route of administration).

Indications for prescription: The spectrum of application of the tablets covers several conditions:

• Obstetrical practice: therapy for habitual miscarriages, as well as treatment of threatened miscarriages. It is important to note that use for this purpose is limited exclusively to the first trimester of pregnancy.
• Gynecological practice: correction of diagnosed menstrual cycle disorders.
• Family planning: use of the combination as a reliable method of contraception.

Side effects: Taking the tablet form may be accompanied by a number of undesirable reactions on the part of the patient's body. The most typical side effects include complaints of nausea, periodic headache, and uncomfortable breast tenderness.

Injectable progestogens

A prominent representative of the injectable form of hormone therapy is hydroxyprogesterone (Hydroxyprogesteronum). It differs in its pharmacological characteristics and indications from oral analogs.

Dosage form: The medication is available exclusively as an oil solution for injection. In clinical practice, it is important not to confuse this form with solutions for intravenous infusions, vaginal suppositories, or tablets—hydroxyprogesterone is administered intramuscularly as an oil depot, which ensures its prolonged action.

Indications for use:

• In obstetrics: the drug is indicated for habitual and threatened miscarriages. Unlike oral combinations, its use is justified throughout the entire first half of pregnancy.
• In oncology: the oil solution of hydroxyprogesterone is included in complex therapy regimens for malignant neoplasms, in particular for uterine cancer and breast cancer.

Contraindications: A key limitation to the use of this oil solution is the development of severe tachycardia directly upon administration of the drug. If such a side effect is recorded, further injections must be discontinued.

Comparative characteristics of drugs

For successful mastery of the topic and the correct choice of patient management tactics, it is necessary to clearly differentiate the characteristics of the two agents reviewed. A summary table below reflects the main differences in dosage forms, timing of application, and safety profile.

Class and exam questions

What else to study on this topic

• Detailed mechanism of oxytocin receptor blockade in the myometrium.
• Pharmacokinetics and absorption features of oil solutions for injection.
• The role of hormone therapy in the complex treatment of uterine and breast cancer.
• Pathogenesis of tachycardia development upon intramuscular administration of injectable progestogens.
• Principles of hormonal contraception and drug correction of the menstrual cycle.

Other topics in the section "Drugs affecting myometrial tone and contractile activity"

Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.