Allylestrenol is indicated in Intra Uterine Growth Retardation (IUGR), Threatened abortion, Habitual abortion, Threatened premature delivery.
Allylestrenol has been found to have a relatively weak progestational effect on the human endometrium. To obtain a full secretory endometrium in oestrogen-primed castrated women or to postpone menstruation (with an oestrogen added) in normal ovulating women, doses of allylestrenol were required which were higher than those recommended for the treatment/prevention of abortion.
In vitro studies have shown that allylestrenol stimulates the synthesis of progesterone in the human placenta. It also brought about a significant (p/. 0,01) increase in the production of some specific placental enzymes (cystine aminopeptidase and heat-stable alkaline phosphatase).
Histological and histochemical changes indicating an increased activity have been found in the placenta, particularly in the syncytiotrophoblast of women with a normal and threatened pregnancy, treated with allylestrenol. The stimulatory effect of allylestrenol on placental function was also suggested by the increased level of placental hormones (pregnanediol, oestriol, HCG and HPL) and enzymes (oxytocinase, CAP) in the maternal urine and plasma, which followed the administration of the drug e.g. in the early weeks as well as in the last trimester of pregnancy.
A study in full-term pregnant women revealed that allylestrenol in high doses (up to 100 mg daily) did suppress the intensity of spontaneous uterine contractions, but had no effect on the sensitivity of the uterine muscle to oxytocin, and no adverse effect on the progress of normal delivery.
Studies in non-pregnant women with and without endocrinological disorders have shown that allylestrenol has no oestrogenic or androgenic properties and no adverse effects on the adrenal function.
No abnormal liver function tests or water and salt retention were observed in healthy female volunteers (non pregnant) who were given allylestrenol.
Threatened Abortion: 5 mg three times daily for 5-7 days. If necessary, the treatment period may be extended. After disappearance of the symptoms the dosage should be gradually reduced unless symptoms return. Habitual abortion: 5-10 mg daily as soon as pregnancy has been diagnosed. The administration should be continued until at least one month after the end of the critical period. Threatened premature labor: The dosage must be determined individually. High dosages (up to 40 mg daily) have been used.
Hypersensitivity; thrombophlebitis; undiagnosed vaginal bleeding, incomplete abortion, hormone-dependent carcinoma, cerebral apoplexy, as a diagnostic test for pregnancy; severe hepatic impairment. Patients with the following conditions should be cautious: Heart disease, congestive heart failure, sick sinus syndrome, coronary artery disease, seizures, epilepsy, renal dysfunction, migraine headaches, or breathing diseases including asthma, emphysema, chronic bronchitis, or COPD, breast-feeding.
Treatment with Allylestrenol (especially a long term treatment) is known to cause some gastrointestinal complaints such as vomiting, nausea, and sometimes epigastric discomfort.
Allylestrenol is specifically designed to be taken during pregnancy. It should be discontinued after delivery as it may affect a nursing infant to a small but noticeable degree.
Symptoms of overdose may include unusual drowsiness; rapid pulse; fainting; unusual muscle movement or rigidity of the face, neck, or limbs; seizures; and loss of consciousness.
Keep below 30°C temperature, away from light & moisture. Keep out of the reach of children.
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