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										
									
- 
										Atazanavir
										
											Increases the effect and toxicity of ergot derivative										
									
- 
										Delavirdine
										
											The antiretroviral agent may increase the ergot derivative toxicity										
									
- 
										Desvenlafaxine
										
											Increased risk of serotonin syndrome. Monitor for symptoms of serotonin syndrome.										
									
- 
										Efavirenz
										
											The antiretroviral agent may increase the ergot derivative toxicity										
									
- 
										Eletriptan
										
											Possible severe and prolonged vasoconstriction										
									
- 
										Epinephrine
										
											Possible marked increase of arterial pressure										
									
- 
										Erythromycin
										
											Possible ergotism and severe ischemia with this combination										
									
- 
										Frovatriptan
										
											Possible severe and prolonged vasoconstriction										
									
- 
										Isosorbide Dinitrate
										
											Possible antagonism of action										
									
- 
										Isosorbide Mononitrate
										
											Possible antagonism of action										
									
- 
										Naratriptan
										
											Possible severe and prolonged vasocontriction										
									
- 
										Nitroglycerin
										
											Possible antagonism of action										
									
- 
										Pentaerythritol Tetranitrate
										
											Possible antagonism of action										
									
- 
										Phenylephrine
										
											Possible marked increase of arterial pressure										
									
- 
										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.										
									
- 
										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. 										
									
- 
										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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											National Drug Code Directory