Nhận Dạng Quốc Tế & Đặc Tính Hóa Học
Monoisotopic mass
339.194677059
InChI
InChI=1S/C20H25N3O2/c1-3-14(11-24)22-20(25)13-7-16-15-5-4-6-17-19(15)12(9-21-17)8-18(16)23(2)10-13/h4-7,9,13-14,18,21,24H,3,8,10-11H2,1-2H3,(H,22,25)/t13-,14+,18-/m1/s1
InChI Key
InChIKey=UNBRKDKAWYKMIV-QWQRMKEZSA-N
IUPAC Name
(4R,7R)-N-[(2S)-1-hydroxybutan-2-yl]-6-methyl-6,11-diazatetracyclo[7.6.1.0^{2,7}.0^{12,16}]hexadeca-1(16),2,9,12,14-pentaene-4-carboxamide
Traditional IUPAC Name
methylergonovine
SMILES
[H][C@@]12CC3=CNC4=CC=CC(=C34)C1=C[C@H](CN2C)C(=O)N[C@@H](CC)CO
pKa (strongest acidic)
15
pKa (Strongest Basic)
7.93
Refractivity
99.58 m3·mol-1
Dược Lực Học :
Methylergometrine is a semisynthetic ergot alkaloid and a derivative of ergonovine and is used for the prevention and control of postpartum and post-abortion hemorrhage. In general, the effects of all the ergot alkaloids appear to results from their actions as partial agonists or antagonists at adrenergic, dopaminergic, and tryptaminergic receptors. The spectrum of effects depends on the agent, dosage, species, tissue, and experimental or physiological conditions. All of the alkaloids of ergot significantly increase the motor activity of the uterus. After small doses contractions are increased in force or frequency, or both, but are followed by a normal degree of relaxation. As the dose is increased, contractions become more forceful and prolonged, resting tonus is markedly increased, and sustained contracture can result.
Cơ Chế Tác Dụng :
A homolog of ergonovine containing one more CH2 group. (Merck Index, 11th ed)
Methylergometrine acts directly on the smooth muscle of the uterus and increases the tone, rate, and amplitude of rhythmic contractions through binding and the resultant antagonism of the dopamine D1 receptor. Thus, it induces a rapid and sustained tetanic uterotonic effect which shortens the third stage of labor and reduces blood loss.
Dược Động Học :
▧ Absorption :
Absorption is rapid after oral (60% bioavailability) and intramuscular (78% bioavailability) administration.
▧ Volume of Distribution :
* 56.1 ± 0 L
▧ Metabolism :
Hepatic, with extensive first-pass metabolism.
▧ Route of Elimination :
Ergot alkaloids are mostly eliminated by hepatic metabolism and excretion, and the decrease in bioavailability following oral administration is probably a result of first-pass metabolism in the liver.
▧ Half Life :
3.39 hours
Độc Tính :
Signs and symptoms of overexposure: hypertension, seizures, headache, hypotension, nausea, and vomiting.
Chỉ Định :
For the prevention and control of excessive bleeding following vaginal childbirth
Tương Tác Thuốc :
-
Almotriptan
Possible severe and prolonged vasoconstriction
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Atazanavir
Increases the effect and toxicity of ergot derivative
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Delavirdine
The antiretroviral agent may increase the ergot derivative toxicity
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Desvenlafaxine
Increased risk of serotonin syndrome. Monitor for symptoms of serotonin syndrome.
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Efavirenz
The antiretroviral agent may increase the ergot derivative toxicity
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Eletriptan
Possible severe and prolonged vasoconstriction
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Epinephrine
Possible marked increase of arterial pressure
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Erythromycin
Possible ergotism and severe ischemia with this combination
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Frovatriptan
Possible severe and prolonged vasoconstriction
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Isosorbide Dinitrate
Possible antagonism of action
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Isosorbide Mononitrate
Possible antagonism of action
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Naratriptan
Possible severe and prolonged vasocontriction
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Nitroglycerin
Possible antagonism of action
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Pentaerythritol Tetranitrate
Possible antagonism of action
-
Phenylephrine
Possible marked increase of arterial pressure
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Telithromycin
Telithromycin may reduce clearance of Methylergonovine. Consider alternate therapy or monitor for changes in the therapeutic/adverse effects of Methylergonovine if Telithromycin is initiated, discontinued or dose changed.
-
Tipranavir
Tipranavir, co-administered with Ritonavir, may increase the plasma concentration of Methylergonovine. Concomitant therapy is contraindicated.
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Tramadol
Increased risk of serotonin syndrome. Monitor for symptoms of serotonin syndrome.
-
Tranylcypromine
Increased risk of serotonin syndrome. Use caution during concomitant therapy and monitor for symptoms of serotonin syndrome.
-
Trazodone
Increased risk of serotonin syndrome. Monitor for symptoms of serotonin syndrome.
-
Trimipramine
Increased risk of serotonin syndrome. Monitor for symptoms of serotonin syndrome.
-
Venlafaxine
Increased risk of serotonin syndrome. Monitor for symptoms of serotonin syndrome.
-
Voriconazole
Voriconazole, a strong CYP3A4 inhibitor, may increase the serum concentration of methylergonovine by decreasing its metabolism. Concomitant therapy is contraindicated.
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Zolmitriptan
Concomitant use of the serotonin 5-HT1D receptor agonist, zolmitriptan, and the ergot derivative, methylergonovine, may result in additive vasoconstrictive effects. Concomitant use within 24 hours is contraindicated.
Liều Lượng & Cách Dùng :
Solution - Intramuscular
Solution - Intravenous
Tablet - Oral
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Tài Liệu Tham Khảo Thêm
National Drug Code Directory