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Methylergometrine: Wikis


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Systematic (IUPAC) name
9,10-didehydro- N-[1-(hydroxymethyl)- propyl]- D-lysergamide
CAS number 113-42-8
ATC code G02AB01
PubChem 8226
Chemical data
Formula C 20H25N3O2  
Mol. mass 339.432 g/mol
SMILES eMolecules & PubChem
Synonyms Methylergobasine
Physical data
Melt. point 172 °C (342 °F)
Pharmacokinetic data
Bioavailability  ?
Metabolism  ?
Half life  ?
Excretion  ?
Therapeutic considerations
Pregnancy cat.  ?
Legal status Prescription only
Routes  ?
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Methylergometrine (other names include methylergonovine, methylergobasin, and d-lysergic acid 1-butanolamide) is a synthetic analogue of ergonovine, a psychedelic alkaloid found in ergot, and many species of morning glory. It is a member of the ergoline family and chemically similar to LSD, ergine, ergometrine, and lysergic acid. Due to its oxytocic properties, it has a medical use in obstetrics. According to Jonathan Ott, methylergonovine has LSD-like actions above 2 milligrams. Clinical dosages are ten times lower.

Methylergometrine maleate is marketed under the trade name Methergine.

Obstetric use

Methylergometrine is a blood vessel constrictor and smooth muscle agonist most commonly used to prevent or control excessive bleeding following childbirth and spontaneous or elective abortion. It also causes uterine contractions to aid in expulsion of retained products of conception after a missed abortion (miscarriage in which all or part of the fetus remains in the uterus) and to help deliver the placenta after childbirth. It is available as tablets or injection (IM or IV) or in liquid form to be taken orally.

Side effects

  • Cholinergic effects such as nausea, vomiting, and diarrhea
  • Cramping
  • Dizziness
  • Pulmonary hypertension
  • Coronary artery vasoconstriction
  • Severe systemic hypertension (especially in patients with preeclampsia)


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