|Other names||Ergonovine, d-lysergic acid beta-propanolamide|
|Metabolism||Liver (partly CYP3A4)|
|Elimination half-life||2-phase (10 min; 2 hrs)|
|CompTox Dashboard (EPA)|
|Chemical and physical data|
|Molar mass||325.412 g·mol−1|
|3D model (JSmol)|
Ergometrine, also known as ergonovine, is a medication used to cause contractions of the uterus to treat heavy vaginal bleeding after childbirth. It can be used either by mouth, by injection into a muscle, or injection into a vein. It begins working within 15 minutes when taken by mouth and is faster in onset when used by injection. Effects last between 45 and 180 minutes.
Common side effect include high blood pressure, vomiting, seizures, headache, and low blood pressure. Other serious side effects include ergotism. It was originally made from the rye ergot fungus but can also be made from lysergic acid. Ergometrine is regulated because it can be used to make lysergic acid diethylamide (LSD).
Ergometrine was discovered in 1932. It is on the World Health Organization's List of Essential Medicines, the safest and most effective medicines needed in a health system.
It has a medical use in obstetrics to facilitate delivery of the placenta and to prevent bleeding after childbirth by causing smooth muscle tissue in the blood vessel walls to narrow, thereby reducing blood flow. It is usually combined with oxytocin (Syntocinon) as syntometrine.
Possible side effects include nausea, vomiting, abdominal pain, diarrhea, headache, dizziness, tinnitus, chest pain, palpitation, bradycardia, transient hypertension and other cardiac arrhythmias, dyspnea, rashes, and shock. An overdose produces a characteristic poisoning, ergotism or "St. Anthony's fire": prolonged vasospasm resulting in gangrene and amputations; hallucinations and dementia; and abortions. Ergometrine has been found to induce atrioventricular (AV) block in one case report.
Gastrointestinal disturbances such as diarrhea, nausea, and vomiting, are common. The drug is contraindicated in pregnancy, vascular disease, and psychosis.
Mechanism of action
While it acts at alpha-adrenergic, dopaminergic, and serotonin receptors (the 5-HT2 receptor), it exerts on the uterus (and other smooth muscles) a powerful stimulant effect not clearly associated with a specific receptor type.
The pharmacological properties of ergot were known and had been utilised by midwives for centuries, but were not thoroughly researched and publicised until the early 20th century. However, its abortifacient effects and the danger of ergotism meant that it was only prescribed cautiously, as in the treatment of postpartum haemorrhage.
Ergometrine was first isolated and obtained by the chemists C Moir and H W Dudley in 1935. Caroline De Costa has argued that the adoption of ergometrine for preventative use and for treating bleeding contributed to the decline in the maternal mortality rate in much of the West during the early 20th century.
Ergometrine is listed as Table I precursors under the United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances, as possible precursor compound for LSD. As an N-alkyl derivative of lysergamide, ergometrine is also covered by the Misuse of Drugs Act 1971, effectively rendering it illegal in the United Kingdom.
- Methylergometrine - a synthetic analogue
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