Imipramine hydrochloride turns yellowish or reddish on exposure to light; slight discoloration does not affect potency, but marked discoloration is associated with loss of potency. Solutions of imipramine hydrochloride are stable at pH 4-5. During storage, minute crystals may form in the injection; the efficacy of the preparation is unaltered if the crystals are redissolved by immersing the ampul in hot water for 1 minute. /Imipramine hydrochloride/
分解：
When heated to decomposition it emits toxic fumes of nitroxides.
Imipramine is nearly exclusively metabolized by the liver. Imipramine is converted to desipramine by CYP1A2, CYP3A4, CYP2C19. Both imipramine and desipramine are hydroxylated by CYP2D6. Desipramine is an active metabolite. Minor metabolic pathways include dealkylation to form an imidodibenzyl product as well as demethylation of desipramine to didemethylimipramine and subsequent hydroxylation. Less than 5% of orally administered imipramine is excreted unchanged.
...STUDY OF METABOLISM OF IMIPRAMINE & ITS METABOLITES BY RAT LIVER MICROSOMES...REVEALED OPERATION OF 16 METABOLIC PATHWAYS, INCL N-DEMETHYLATION, AROMATIC HYDROXYLATIONS, SIDE-CHAIN DEALKYLATIONS, N-OXIDATION, N-OXIDE REDUCTION, & CONJUGATION REACTIONS.
来源:Hazardous Substances Data Bank (HSDB)
代谢
IMIPRAMINE N-OXIDE & IMINODIBENZYL...IDENTIFIED AS ADDITIONAL URINARY METABOLITES IN MAN.
IMIPRAMINE N-OXIDE & IMINODIBENZYL...IDENTIFIED AS ADDITIONAL URINARY METABOLITES IN MAN.
...METABOLIZED IN HUMANS BY N-DEMETHYLATION & BY HYDROXYLATION IN ONE OF THE AROMATIC RINGS OR IN ETHYLENE BRIDGE TO GIVE DESMONOMETHYLIMIPRAMINE (DMI) & DESDIMETHYLIMIPRAMINE (DDMI) & THE 2-HYDROXY & 10-HYDROXY DERIVATIVES OF IMIPRAMINE, DMI & DDMI, TOGETHER WITH THEIR GLUCURONIDE CONJUGATES.
来源:Hazardous Substances Data Bank (HSDB)
代谢
丙咪嗪（半衰期，16小时）被生物转化为活性代谢物，去甲丙咪嗪（半衰期，18小时）。
IMIPRAMINE (HALF-LIFE, 16 HOURS) IS BIOTRANSFORMED TO THE ACTIVE METABOLITE, DESIPRAMINE (HALF-LIFE, 18 HOURS).
IDENTIFICATION: Imipramine is a tricyclic antidepressant drug. Properties of the substance: Imipramine hydrochloride is a white or slightly yellow, odorless or almost odorless, crystalline powder. It is soluble in water, alcohol, chloroform, and acetone; practically insoluble in ether. Indications: Treatment of depression; nocturnal enuresis in children HUMAN EXPOSURE: Main risks and target organs: Affects the parasympathetic nervous system, central nervous system, and cardiovascular system. Summary of clinical effects: Early symptoms: mydriasis, blurred vision, dry mouth, tachycardia, hyperpyrexia, urinary retention, decreased intestinal peristalsis, and CNS excitation. Extrapyramidal symptoms may occur. Later more serious features: convulsions, coma, hypotension, arrhythmias, and cardiorespiratory arrest. The progression from being alert with mild symptoms to life-threatening toxic effects may be extremely rapid. Contraindications: Epilepsy, organic brain damage, urine retention, heart diseases, acute glaucoma. Hyperthyroidism and liver diseases are a relative contraindication. Routes of entry: Oral: Preferred route of administration. Parenteral: In the initial stages of treatment, if administration by mouth is impracticable or inadvisable imipramine may be given by intramuscular injection. Absorption by route of exposure: Oral: absorption occurs in the small intestine with little or no absorption in the stomach. Absorption is virtually complete (95%). The peak plasma concentration occurs 2 to 6 hours after administration. Food does not affect absorption, peak concentration or time to peak concentration. Large doses may be absorbed more slowly due to delayed gastric emptying and reduced peristalsis. Large amounts of imipramine, including intact pill fragments, have been recovered at autopsy. Parenteral: absorption appears to be complete since recovery of urinary metabolites is the same after either oral or parenteral administration. Distribution by route of exposure: Imipramine is lipophilic and therefore widely distributed in the body. Distribution is influenced by the degree of binding to plasma proteins. Plasma protein binding of imipramine ranges from 60 to 96%. Biological half-life by route of exposure: The half-life of imipramine is approximately 20 hours. Its active metabolite desipramine has a half-life of up to 125 hours. Metabolism: Imipramine is metabolised almost exclusively in the liver, undergoing oxidation by microsomal enzymes, followed by conjugation with glucuronic acid. Imipramine is mainly metabolised by demethylation to an active metabolite desipramine, and to a lesser extent by aromatic 2-hydroxylation to 2-hydroxyimipramine. Desipramine is metabolised by aromatic 2-hydroxylation to 2-hydroxydesimipramine. Quantitatively, hydroxylation is the most important intermediate metabolic pathway and it is the rate-limiting step for the elimination of imipramine and desimipramine. The greater plasma elimination half-life for desimipramine compared with imipramine may be due to a lower rate of hydroxylation. Both imipramine and desimipramine undergo substantial and highly variable first-pass metabolism, the extent of which is determined by oxidative phenotype. In Caucasians, there are slow and fast metabolizers: at least 6.5 to 10% of the population are slow metabolizers. First-pass metabolism of imipramine and desimipramine is reduced in slow metabolizers. Smoking, alcohol ingestion and other drugs may influence imipramine and desimipramine metabolism by altering the mixed function oxidase system: Smokers have lower steady-state levels of imipramine than non-smokers. Alcoholics were found to have a 3-fold greater intrinsic clearance of imipramine. Cimetidine increases the bioavailability of imipramine by 40 to 75%. Some drugs, such as haloperidol, disulfiram, and morphine, may prolong toxicity by inhibiting hydroxylation. Elimination by route of exposure: Less than 5% of an oral dose of imipramine is excreted unchanged in the urine. In patients with chronic renal failure, disproportionate increases in hydroxymetabolite concentration may occur. Mode of action: Toxicodynamics: Anticholinergic effects: increased heart rate. Quinidine-like effects on the heart due to slowing of sodium influx and potassium efflux, resulting in slowing of conduction and repolarization. Slowing of conduction notably occurs at the His-Purkinje portion of the atrioventricular conduction system resulting in prolongation of the PR- and QRS- intervals. Prolonged depolarization results in lengthening of the QT-interval. Peripheral receptor blockade may cause orthostatic hypotension. Pharmacodynamics: The probable mechanism of antidepressant activity is central inhibition of biogenic amine reuptake, predominantly affecting norepinephrine and serotonin. In addition to its central effects, imipramine is also a competitive antagonist at histamine H1 and H2 receptors. Interactions: Effect on imipramine itself: potentiation due to reduced hepatic metabolism by: neuroleptic drugs, methylphenidate, and certain steroids, including oral contraceptives. Reduced effect due to enhanced hepatic metabolism by barbiturates, certain other sedatives, and cigarette smoking. Effect of imipramine on other substances. Potentiates the effect of alcohol and probably other CNS depressants. Potentiates the anticholinergic effects of anticholinergic drugs used in the treatment of Parkinson's disease. Potentiates the effect of biogenic amines, such as norepinephrine, which are normally removed from their site of action by neuronal reuptake. Blocks the effects of indirectly acting amines, such as tyramine. Prevents the action of adrenergic neuron blocking agents such as guanethidine. Potentiates central nervous stimulation by amphetamine but blocks its peripheral effects. A particularly severe interaction occurs with concurrent administration of an MAO inhibitor and a tricyclic antidepressant. The resultant syndrome can include severe CNS toxicity, marked by hyperpyrexia, convulsions and coma. Main adverse effects: Antimuscarinic effects include dry mouth, a sour or metallic taste, epigastric distress, constipation, dizziness, tachycardia, palpitations, blurred vision and urinary retention. Paradoxically, excessive sweating. Weakness and fatigue. Older patients suffer more from dizziness, postural hypotension, constipation, delayed micturition, oedema, and muscle tremors. In approximately 10% of treated patients and in over 30% of patients over age 50, manic reactions, confusion, or delirium may occur. Extrapyramidal reactions are rare, though tremor is not unusual. A withdrawal syndrome, may occur in children, who experience gastrointestinal symptoms.
Imipramine works by inhibiting the neuronal reuptake of the neurotransmitters norepinephrine and serotonin. It binds the sodium-dependent serotonin transporter and sodium-dependent norepinephrine transporter preventing or reducing the reuptake of norepinephrine and serotonin by nerve cells. Depression has been linked to a lack of stimulation of the post-synaptic neuron by norepinephrine and serotonin. Slowing the reuptake of these neurotransmitters increases their concentration in the synaptic cleft, which is thought to contribute to relieving symptoms of depression. In addition to acutely inhibiting neurotransmitter re-uptake, imipramine causes down-regulation of cerebral cortical beta-adrenergic receptors and sensitization of post-synaptic serotonergic receptors with chronic use. This leads to enhanced serotonergic transmission.
Liver test abnormalities have been reported to occur in up to 20% of patients on long term therapy with imipramine, but elevations are uncommonly above 3 times the upper limit of normal. The aminotransferase abnormalities are usually mild, asymptomatic and transient, reversing even with continuation of medication. Rare instances of clinically apparent acute liver injury as well as prolonged jaundice have been reported due to imipramine. The onset of jaundice is usually with 1 to 8 weeks of starting therapy. The pattern of enzyme elevations varies from hepatocellular to mixed or cholestatic. Signs and symptoms of hypersensitivity (fever, rash, eosinophilia) are common, but usually not very prominent. Rapid recurrence with rechallenge is common. Autoantibody formation is rare. Rare instances of acute liver failure and death attributed to imipramine have been reported.
Rapidly and well absorbed (>95%) after oral administration. The primary site of absorption is the small intestine as the basic amine groups are ionized in the acidic environment of the stomach, preventing movement across tissues. Bioavailability ranges from 29-77% due to high inter-individual variability. Peak plasma concentration is usually attained 2-6 hours following oral administration. Absorption is unaffected by food.
来源:DrugBank
吸收、分配和排泄
消除途径
丙咪嗪主要经尿液排泄，原形药物含量少于5%。
Imipramine is primarily excreted in the urine with less than 5% present as the parent compound
Imipramine has a high apparent volume of distribution of 10-20 L/kg. The drug is known to accumulate in the brain at concentrations 30-40 times that in systemic circulation.
TRICYCLIC ANTIDEPRESSANTS ARE FAIRLY WELL ABSORBED AFTER ORAL ADMINISTRATION. ... ONCE ABSORBED /IT/ IS WIDELY DISTRIBUTED. ... ARE STRONGLY BOUND TO PLASMA PROTEIN AND TO THE CONSTITUENTS OF TISSUES./TRICYCLIC ANTIDEPRESSANTS
[EN] COMPOUNDS AND THEIR USE AS BACE INHIBITORS<br/>[FR] COMPOSÉS ET LEUR UTILISATION EN TANT QU'INHIBITEURS DE BACE
申请人：ASTRAZENECA AB
公开号：WO2016055858A1
公开（公告）日：2016-04-14
The present application relates to compounds of formula (I), (la), or (lb) and their pharmaceutical compositions/preparations. This application further relates to methods of treating or preventing Αβ-related pathologies such as Down's syndrome, β- amyloid angiopathy such as but not limited to cerebral amyloid angiopathy or hereditary cerebral hemorrhage, disorders associated with cognitive impairment such as but not limited to MCI ("mild cognitive impairment"), Alzheimer's disease, memory loss, attention deficit symptoms associated with Alzheimer's disease, neurodegeneration associated with diseases such as Alzheimer's disease or dementia, including dementia of mixed vascular and degenerative origin, pre-senile dementia, senile dementia and dementia associated with Parkinson's disease.
New Drug Delivery System for Crossing the Blood Brain Barrier
申请人：Lipshutz H. Bruce
公开号：US20070203080A1
公开（公告）日：2007-08-30
New ubiquinol analogs are disclosed, as well as methods of using these compounds to deliver drug moieties to the body.
新的泛醌类似物被披露，以及利用这些化合物将药物基团输送到人体的方法。
[EN] METHYL OXAZOLE OREXIN RECEPTOR ANTAGONISTS<br/>[FR] MÉTHYLOXAZOLES ANTAGONISTES DU RÉCEPTEUR DE L'OREXINE
申请人：MERCK SHARP & DOHME
公开号：WO2016089721A1
公开（公告）日：2016-06-09
The present invention is directed to methyl oxazole compounds which are antagonists of orexin receptors. The present invention is also directed to uses of the compounds described herein in the potential treatment or prevention of neurological and psychiatric disorders and diseases in which orexin receptors are involved. The present invention is also directed to compositions comprising these compounds. The present invention is also directed to uses of these compositions in the potential prevention or treatment of such diseases in which orexin receptors are involved.
4' SUBSTITUTED COMPOUNDS HAVING 5-HT6 RECEPTOR AFFINITY
申请人：Dunn Robert
公开号：US20080318941A1
公开（公告）日：2008-12-25
The present disclosure provides compounds having affinity for the 5-HT
6
receptor which are of the formula (I):
wherein R
1
, R
2
, R
5
, R
6
, B, D, E, G, Q, x and n are as defined herein. The disclosure also relates to methods of preparing such compounds, compositions containing such compounds, and methods of use thereof.
Heterobicyclic compounds of Formula (I):
or a pharmaceutically-acceptable salt, tautomer, or stereoisomer thereof, as defined in the specification, and compositions containing them, and processes for preparing such compounds. Provided herein also are methods of treating disorders or diseases treatable by inhibition of PDE10, such as obesity, non-insulin dependent diabetes, schizophrenia, bipolar disorder, obsessive-compulsive disorder, Huntington's Disease, and the like.
Formula (I)的杂环化合物：
或其药用可接受的盐、互变异构体或立体异构体，如规范中所定义，并含有它们的组合物，以及制备这种化合物的方法。本文还提供了通过抑制PDE10来治疗由此可治疗的疾病或疾病的方法，如肥胖症、非胰岛素依赖型糖尿病、精神分裂症、躁郁症、强迫症、亨廷顿病等。
