Amphetamine
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Amphetamine \\\\\\\\\\\\\\[note 1\\\\\\\\\\\\\\] contracted from a lpha - m ethyl ph en et hyl amine is a potent central nervous system CNS stimulant that is used in the treatment of attention deficit hyperactivity disorder ADHD , narcolepsy , and obesity. Amphetamine was discovered in and exists as two enantiomers: Amphetamine properly refers to a specific chemical, the racemic free base , which is equal parts of the two enantiomers, levoamphetamine and dextroamphetamine, in their pure amine forms. The term is frequently used informally to refer to any combination of the enantiomers, or to either of them alone. Historically, it has been used to treat nasal congestion and depression. Amphetamine is also used as an athletic performance enhancer and cognitive enhancer , and recreationally as an aphrodisiac and euphoriant. It is a prescription drug in many countries, and unauthorized possession and distribution of amphetamine are often tightly controlled due to the significant health risks associated with recreational use. The first amphetamine pharmaceutical was Benzedrine , a brand which was used to treat a variety of conditions. Currently, pharmaceutical amphetamine is prescribed as racemic amphetamine, Adderall , \\\\\\\\\\\\\\[note 3\\\\\\\\\\\\\\] dextroamphetamine , or the inactive prodrug lisdexamfetamine. Amphetamine, through activation of a trace amine receptor , increases monoamine and excitatory neurotransmitter activity in the brain, with its most pronounced effects targeting the catecholamine neurotransmitters norepinephrine and dopamine. At therapeutic doses, amphetamine causes emotional and cognitive effects such as euphoria , change in desire for sex , increased wakefulness , and improved cognitive control. It induces physical effects such as decreased reaction time, fatigue resistance, and increased muscle strength. Larger doses of amphetamine may impair cognitive function and induce rapid muscle breakdown. Drug addiction is a serious risk with large recreational doses but is unlikely to arise from typical long-term medical use at therapeutic doses. Very high doses can result in psychosis e. Recreational doses are generally much larger than prescribed therapeutic doses and carry a far greater risk of serious side effects. Amphetamine belongs to the phenethylamine class. It is also the parent compound of its own structural class, the substituted amphetamines , \\\\\\\\\\\\\\[note 4\\\\\\\\\\\\\\] which includes prominent substances such as bupropion , cathinone , MDMA , and methamphetamine. As a member of the phenethylamine class, amphetamine is also chemically related to the naturally occurring trace amine neuromodulators, specifically phenethylamine and N -methylphenethylamine , both of which are produced within the human body. Phenethylamine is the parent compound of amphetamine, while N -methylphenethylamine is a positional isomer of amphetamine that differs only in the placement of the methyl group. Amphetamine is used to treat attention deficit hyperactivity disorder ADHD , narcolepsy a sleep disorder , and obesity , and is sometimes prescribed off-label for its past medical indications , particularly for depression and chronic pain. Reviews of clinical stimulant research have established the safety and effectiveness of long-term continuous amphetamine use for the treatment of ADHD. Amphetamine is used by some athletes for its psychological and athletic performance-enhancing effects , such as increased endurance and alertness; \\\\\\\\\\\\\\[27\\\\\\\\\\\\\\] \\\\\\\\\\\\\\[40\\\\\\\\\\\\\\] however, non-medical amphetamine use is prohibited at sporting events that are regulated by collegiate, national, and international anti-doping agencies. The side effects of amphetamine are varied, and the amount of amphetamine used is the primary factor in determining the likelihood and severity of side effects. At normal therapeutic doses, the physical side effects of amphetamine vary widely by age and from person to person. Amphetamine stimulates the medullary respiratory centers , producing faster and deeper breaths. USFDA-commissioned studies from indicate that in children, young adults, and adults there is no association between serious adverse cardiovascular events sudden death , heart attack , and stroke and the medical use of amphetamine or other ADHD stimulants. At normal therapeutic doses, the most common psychological side effects of amphetamine include increased alertness , apprehension, concentration , initiative, self-confidence , and sociability, mood swings elated mood followed by mildly depressed mood , insomnia or wakefulness , and decreased sense of fatigue. Amphetamine has also been shown to produce a conditioned place preference in humans taking therapeutic doses, \\\\\\\\\\\\\\[64\\\\\\\\\\\\\\] \\\\\\\\\\\\\\[97\\\\\\\\\\\\\\] meaning that individuals acquire a preference for spending time in places where they have previously used amphetamine. An amphetamine overdose can lead to many different symptoms, but is rarely fatal with appropriate care. Pathological overactivation of the mesolimbic pathway , a dopamine pathway that connects the ventral tegmental area to the nucleus accumbens , plays a central role in amphetamine addiction. Addiction is a serious risk with heavy recreational amphetamine use but is unlikely to arise from typical long-term medical use at therapeutic doses. Chronic use of amphetamine at excessive doses causes alterations in gene expression in the mesocorticolimbic projection , which arise through transcriptional and epigenetic mechanisms. The effects of amphetamine on gene regulation are both dose- and route-dependent. As of May , \\\\\\\\\\\\\\[update\\\\\\\\\\\\\\] there is no effective pharmacotherapy for amphetamine addiction. Cognitive behavioral therapy is currently the most effective clinical treatment for psychostimulant addictions. In rodents and primates, sufficiently high doses of amphetamine cause dopaminergic neurotoxicity , or damage to dopamine neurons, which is characterized by dopamine terminal degeneration and reduced transporter and receptor function. A severe amphetamine overdose can result in a stimulant psychosis that may involve a variety of symptoms, such as delusions and paranoia. Many types of substances are known to interact with amphetamine, resulting in altered drug action or metabolism of amphetamine, the interacting substance, or both. In particular, amphetamine may decrease the effects of sedatives and depressants and increase the effects of stimulants and antidepressants. In general, there is no significant interaction when consuming amphetamine with food, but the pH of gastrointestinal content and urine affects the absorption and excretion of amphetamine, respectively. Amphetamine exerts its behavioral effects by altering the use of monoamines as neuronal signals in the brain, primarily in catecholamine neurons in the reward and executive function pathways of the brain. Amphetamine has been identified as a potent full agonist of trace amine-associated receptor 1 TAAR1 , a G s -coupled and G q -coupled G protein-coupled receptor GPCR discovered in , which is important for regulation of brain monoamines. Dextroamphetamine is a more potent agonist of TAAR1 than levoamphetamine. In certain brain regions, amphetamine increases the concentration of dopamine in the synaptic cleft. Amphetamine is also a substrate for the presynaptic vesicular monoamine transporter , VMAT2. Similar to dopamine, amphetamine dose-dependently increases the level of synaptic norepinephrine, the direct precursor of epinephrine. Amphetamine exerts analogous, yet less pronounced, effects on serotonin as on dopamine and norepinephrine. Acute amphetamine administration in humans increases endogenous opioid release in several brain structures in the reward system. The half-life of amphetamine enantiomers differ and vary with urine pH. The prodrug lisdexamfetamine is not as sensitive to pH as amphetamine when being absorbed in the gastrointestinal tract; \\\\\\\\\\\\\\[\\\\\\\\\\\\\\] following absorption into the blood stream, it is converted by red blood cell -associated enzymes to dextroamphetamine via hydrolysis. Amphetamine has a very similar structure and function to the endogenous trace amines, which are naturally occurring neurotransmitter molecules produced in the human body and brain. Amphetamine is a methyl homolog of the mammalian neurotransmitter phenethylamine with the chemical formula C 9 H 13 N. The carbon atom adjacent to the primary amine is a stereogenic center , and amphetamine is composed of a racemic 1: The substituted derivatives of amphetamine, or 'substituted amphetamines', are a broad range of chemicals that contain amphetamine as a 'backbone'; \\\\\\\\\\\\\\[5\\\\\\\\\\\\\\] \\\\\\\\\\\\\\[48\\\\\\\\\\\\\\] \\\\\\\\\\\\\\[\\\\\\\\\\\\\\] specifically, this chemical class includes derivative compounds that are formed by replacing one or more hydrogen atoms in the amphetamine core structure with substituents. Since the first preparation was reported in , \\\\\\\\\\\\\\[\\\\\\\\\\\\\\] numerous synthetic routes to amphetamine have been developed. This intermediate is then hydrolyzed using hydrochloric acid, and subsequently basified, extracted with organic solvent, concentrated, and distilled to yield the free base. The free base is then dissolved in an organic solvent, sulfuric acid added, and amphetamine precipitates out as the sulfate salt. A number of chiral resolutions have been developed to separate the two enantiomers of amphetamine. In one example, optically pure R phenyl-ethanamine is condensed with phenylacetone to yield a chiral Schiff base. In the key step, this intermediate is reduced by catalytic hydrogenation with a transfer of chirality to the carbon atom alpha to the amino group. Cleavage of the benzylic amine bond by hydrogenation yields optically pure dextroamphetamine. A large number of alternative synthetic routes to amphetamine have been developed based on classic organic reactions. In this route, allylbenzene is reacted acetonitrile in sulfuric acid to yield an organosulfate which in turn is treated with sodium hydroxide to give amphetamine via an acetamide intermediate. A significant number of amphetamine syntheses feature a reduction of a nitro , imine , oxime or other nitrogen-containing functional groups. Amphetamine is frequently measured in urine or blood as part of a drug test for sports, employment, poisoning diagnostics, and forensics. For the assays, a study noted that an enzyme multiplied immunoassay technique EMIT assay for amphetamine and methamphetamine may produce more false positives than liquid chromatography—tandem mass spectrometry. Amphetamine is still illegally synthesized today in clandestine labs and sold on the black market , primarily in European countries. From Wikipedia, the free encyclopedia. This article is about mixtures of levoamphetamine and dextroamphetamine. For other uses, see Amphetamine disambiguation. C Risk not ruled out. Class A3 Psychoactive drugs CA: Metabolic pathways of amphetamine in humans \\\\\\\\\\\\\\[sources 15\\\\\\\\\\\\\\]. For more details on related compounds, see Trace amine. Amphetamine hydrochloride left bowl Phenylnitropropene right cups. For a more comprehensive list, see Substituted amphetamine. Synthesis by the Leuckart reaction. Stereoselective synthesis of amphetamine. Synthesis by Friedel—Crafts alkylation. Synthesis via Hofmann and Curtius rearrangements. Synthesis using phenylacetone and ammonia. History and culture of substituted amphetamines. USFDA contraindications are not necessarily intended to limit medical practice but limit claims by pharmaceutical companies. Due to pharmacological differences between these medications e. Text color Transcription factors. Reinforcement and Addictive Disorders'. A Foundation for Clinical Neuroscience 2nd ed. While physical dependence and withdrawal occur with some drugs of abuse opiates, ethanol , these phenomena are not useful in the diagnosis of addiction because they do not occur with other drugs of abuse cocaine, amphetamine and can occur with many drugs that are not abused propranolol, clonidine. Retrieved 5 August The intravenous use of d-amphetamine and other stimulants still pose major safety risks to the individuals indulging in this practice. Some of this intravenous abuse is derived from the diversion of ampoules of d-amphetamine, which are still occasionally prescribed in the UK for the control of severe narcolepsy and other disorders of excessive sedation. For these reasons, observations of dependence and abuse of prescription d-amphetamine are rare in clinical practice, and this stimulant can even be prescribed to people with a history of drug abuse provided certain controls, such as daily pick-ups of prescriptions, are put in place Jasinski and Krishnan, b. United States Food and Drug Administration. Retrieved 30 December The simplest unsubstituted phenylisopropylamine, 1-phenylaminopropane, or amphetamine, serves as a common structural template for hallucinogens and psychostimulants. Amphetamine produces central stimulant, anorectic, and sympathomimetic actions, and it is the prototype member of this class The phase 1 metabolism of amphetamine analogs is catalyzed by two systems: Amphetamine can also undergo aromatic hydroxylation to p -hydroxyamphetamine. Stereochemical course of the reaction' PDF. Retrieved 6 November Retrieved 5 November Retrieved 21 January Attention Deficit Hyperactivity Disorder Handbook: Retrieved 18 May Hazardous Substances Data Bank. Archived from the original on 2 October Retrieved 2 October Duration of effect varies depending on agent and urine pH. Excretion is enhanced in more acidic urine. Amphetamines are distributed into most body tissues with high concentrations occurring in the brain and CSF. Retrieved 17 April Use and Misuse of Amphetamines: International Perspectives on Current Trends. Retrieved 1 December Amphetamine, in the singular form, properly applies to the racemate of 2-aminophenylpropane. In its broadest context, however, the term \\\\\\\\\\\\\\[ amphetamines \\\\\\\\\\\\\\] can even embrace a large number of structurally and pharmacologically related substances. Retrieved 9 November Royal Society of Chemistry. Retrieved 13 October International Union of Pure and Applied Chemistry. Archived from the original on 17 March Retrieved 14 March One of a pair of molecular entities which are mirror images of each other and non-superposable. Higher Cognitive Function and Behavioral Control'. Therapeutic relatively low doses of psychostimulants, such as methylphenidate and amphetamine, improve performance on working memory tasks both in normal subjects and those with ADHD. Thus, stimulants improve performance on effortful but tedious tasks Beyond these general permissive effects, dopamine acting via D1 receptors and norepinephrine acting at several receptors can, at optimal levels, enhance working memory and aspects of attention. Amphetamines and caffeine are stimulants that increase alertness, improve focus, decrease reaction time, and delay fatigue, allowing for an increased intensity and duration of training United Nations Treaty Collection. Archived from the original on 31 March Retrieved 11 November Stimulant misuse appears to occur both for performance enhancement and their euphorogenic effects, the latter being related to the intrinsic properties of the stimulants e. Although useful in the treatment of ADHD, stimulants are controlled II substances with a history of preclinical and human studies showing potential abuse liability. United States National Library of Medicine. Retrieved 16 December In principle, INNs are selected only for the active part of the molecule which is usually the base, acid or alcohol. In some cases, however, the active molecules need to be expanded for various reasons, such as formulation purposes, bioavailability or absorption rate. In the experts designated for the selection of INN decided to adopt a new policy for naming such molecules. In future, names for different salts or esters of the same active substance should differ only with regard to the inactive moiety of the molecule. Retrieved 11 August National Drug Code Directory. Archived from the original on 16 December When considered together with the rapidly growing literature in the field a compelling case emerges in support of developing TAAR1-selective agonists as medications for preventing relapse to psychostimulant abuse. Shoptaw SJ, Ali R, ed. A minority of individuals who use amphetamines develop full-blown psychosis requiring care at emergency departments or psychiatric hospitals. In such cases, symptoms of amphetamine psychosis commonly include paranoid and persecutory delusions as well as auditory and visual hallucinations in the presence of extreme agitation. Findings from one trial indicate use of antipsychotic medications effectively resolves symptoms of acute amphetamine psychosis. Archived from the original PDF on 3 November Retrieved 2 November Such agents also have important therapeutic uses; cocaine, for example, is used as a local anesthetic Chapter 2 , and amphetamines and methylphenidate are used in low doses to treat attention deficit hyperactivity disorder and in higher doses to treat narcolepsy Chapter Despite their clinical uses, these drugs are strongly reinforcing, and their long-term use at high doses is linked with potential addiction, especially when they are rapidly administered or when high-potency forms are given. When oral formulations of psychostimulants are used at recommended doses and frequencies, they are unlikely to yield effects consistent with abuse potential in patients with ADHD. Berlin, Germany; London, England: Retrieved 19 October Beyond 1 R ,2 S -ephedrine and 1 S ,2 S -pseudoephedrine, myriad other substituted amphetamines have important pharmaceutical applications. Basal ganglia regions like the right globus pallidus, the right putamen, and the nucleus caudatus are structurally affected in children with ADHD. These changes and alterations in limbic regions like ACC and amygdala are more pronounced in non-treated populations and seem to diminish over time from child to adulthood. Treatment seems to have positive effects on brain structure. Among significantly improved outcomes, the largest effect sizes were found for combination treatment. The greatest improvements were associated with academic, self-esteem, or social function outcomes. Recent studies have demonstrated that stimulants, along with the non-stimulants atomoxetine and extended-release guanfacine, are continuously effective for more than 2-year treatment periods with few and tolerable adverse effects. The effectiveness of long-term therapy includes not only the core symptoms of ADHD, but also improved quality of life and academic achievements. The most concerning short-term adverse effects of stimulants, such as elevated blood pressure and heart rate, waned in long-term follow-up studies. Monoamines, Acetylcholine, and Orexin'. Only one paper 53 examining outcomes beyond 36 months met the review criteria. Retrieved 12 November The procognitive actions of psychostimulants are only associated with low doses. Surprisingly, despite nearly 80 years of clinical use, the neurobiology of the procognitive actions of psychostimulants has only recently been systematically investigated. Collectively, this evidence indicates that at low, clinically relevant doses, psychostimulants are devoid of the behavioral and neurochemical actions that define this class of drugs and instead act largely as cognitive enhancers improving PFC-dependent function. In particular, in both animals and humans, lower doses maximally improve performance in tests of working memory and response inhibition, whereas maximal suppression of overt behavior and facilitation of attentional processes occurs at higher doses. Specifically, in a set of experiments limited to high-quality designs, we found significant enhancement of several cognitive abilities. The results of this meta-analysis Amphetamine has been shown to improve consolidation of information 0. Neural and Neuroendocrine Control of the Internal Milieu'. Dopamine acts in the nucleus accumbens to attach motivational significance to stimuli associated with reward. Archived from the original on 15 August Retrieved 2 December National Collegiate Athletic Association. Retrieved 8 October In , Chandler and Blair 47 showed significant increases in knee extension strength, acceleration, anaerobic capacity, time to exhaustion during exercise, pre-exercise and maximum heart rates, and time to exhaustion during maximal oxygen consumption VO2 max testing after administration of 15 mg of dextroamphetamine versus placebo. Most of the information to answer this question has been obtained in the past decade through studies of fatigue rather than an attempt to systematically investigate the effect of ADHD drugs on exercise. In high-ambient temperatures, dopaminergic manipulations clearly improve performance. The distribution of the power output reveals that after dopamine reuptake inhibition, subjects are able to maintain a higher power output compared with placebo. For instance, amphetamine, which increases concentrations of dopamine at the synaptic cleft advances the start of responding during interval timing, whereas antagonists of D2 type dopamine receptors typically slow timing; Depletion of dopamine in healthy volunteers impairs timing, while amphetamine releases synaptic dopamine and speeds up timing. Aside from accounting for the reduced performance of mentally fatigued participants, this model rationalizes the reduced RPE and hence improved cycling time trial performance of athletes using a glucose mouthwash Chambers et al. Dopamine stimulating drugs are known to enhance aspects of exercise performance Roelands et al. This indicates that subjects did not feel they were producing more power and consequently more heat. Taken together, these data indicate strong ergogenic effects of an increased DA concentration in the brain, without any change in the perception of effort. Rather they are intended to limit claims by pharmaceutical companies. International Programme on Chemical Safety. Retrieved 24 June Retrieved 4 August Retrieved 29 April Decongestants Causing Rhinitis Medicamentosa — Nasal decongestants: Retrieved 4 November Merck Manual for Health Care Professionals. Retrieved 8 May This study demonstrates that humans, like nonhumans, prefer a place associated with amphetamine administration. These findings support the idea that subjective responses to a drug contribute to its ability to establish place conditioning. Amphetamine, dextroamphetamine, and methylphenidate act as substrates for the cellular monoamine transporter, especially the dopamine transporter DAT and less so the norepinephrine NET and serotonin transporter. The mechanism of toxicity is primarily related to excessive extracellular dopamine, norepinephrine, and serotonin. Retrieved 3 March Retrieved 31 October Despite the importance of numerous psychosocial factors, at its core, drug addiction involves a biological process: Moreover, there is increasing evidence that, despite a range of genetic risks for addiction across the population, exposure to sufficiently high doses of a drug for long periods of time can transform someone who has relatively lower genetic loading into an addict. Similar to environmental enrichment, studies have found that exercise reduces self-administration and relapse to drugs of abuse Cosgrove et al. There is also some evidence that these preclinical findings translate to human populations, as exercise reduces withdrawal symptoms and relapse in abstinent smokers Daniel et al. In humans, the role of dopamine signaling in incentive-sensitization processes has recently been highlighted by the observation of a dopamine dysregulation syndrome in some patients taking dopaminergic drugs. This syndrome is characterized by a medication-induced increase in or compulsive engagement in non-drug rewards such as gambling, shopping, or sex Evans et al. Exercise has been proposed as a treatment for drug addiction that may reduce drug craving and risk of relapse. Although few clinical studies have investigated the efficacy of exercise for preventing relapse, the few studies that have been conducted generally report a reduction in drug craving and better treatment outcomes Taken together, these data suggest that the potential benefits of exercise during relapse, particularly for relapse to psychostimulants, may be mediated via chromatin remodeling and possibly lead to greater treatment outcomes. From human to animal studies'. The postulate that exercise serves as an ideal intervention for drug addiction has been widely recognized and used in human and animal rehabilitation. The limited research conducted suggests that exercise may be an effective adjunctive treatment for SUDs. In contrast to the scarce intervention trials to date, a relative abundance of literature on the theoretical and practical reasons supporting the investigation of this topic has been published. Currently, cognitive—behavioral therapies are the most successful treatment available for preventing the relapse of psychostimulant use. Mount Sinai School of Medicine. Retrieved 9 February A diagnostic term in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders DSM-5 referring to recurrent use of alcohol or other drugs that causes clinically and functionally significant impairment, such as health problems, disability, and failure to meet major responsibilities at work, school, or home. Depending on the level of severity, this disorder is classified as mild, moderate, or severe. A term used to indicate the most severe, chronic stage of substance-use disorder, in which there is a substantial loss of self-control, as indicated by compulsive drug taking despite the desire to stop taking the drug. In the DSM-5, the term addiction is synonymous with the classification of severe substance-use disorder. This is known to occur on many genes including fosB and c-fos in response to psychostimulant exposure. Chronic exposure to psychostimulants increases glutamatergic \\\\\\\\\\\\\\[signaling\\\\\\\\\\\\\\] from the prefrontal cortex to the NAc. Coincident and convergent input often induces plasticity on a postsynaptic neuron. The NAc integrates processed information about the environment from basolateral amygdala, hippocampus, and prefrontal cortex PFC , as well as projections from midbrain dopamine neurons. Previous studies have demonstrated how dopamine modulates this integrative process. For example, high frequency stimulation potentiates hippocampal inputs to the NAc while simultaneously depressing PFC synapses Goto and Grace, Most addictive drugs increase extracellular concentrations of dopamine DA in nucleus accumbens NAc and medial prefrontal cortex mPFC , projection areas of mesocorticolimbic DA neurons and key components of the 'brain reward circuit'. Amphetamine achieves this elevation in extracellular levels of DA by promoting efflux from synaptic terminals. Chronic exposure to amphetamine induces a unique transcription factor delta FosB, which plays an essential role in long-term adaptive changes in the brain. The net result is gene activation and increased CDK5 expression. The net result is c-fos gene repression. Transcriptional mechanisms of addiction: Drug Use and Abuse'. Merck Manual Home Edition. Archived from the original on 17 February Retrieved 28 February Signal Transduction in the Brain'. Expert Rev Clin Pharmacol. Despite concerted efforts to identify a pharmacotherapy for managing stimulant use disorders, no widely effective medications have been approved. To date, no pharmacological treatment has been approved for \\\\\\\\\\\\\\[addiction\\\\\\\\\\\\\\], and psychotherapy remains the mainstay of treatment. A promising target for the treatment of psychostimulant addiction'. Existing data provided robust preclinical evidence supporting the development of TAAR1 agonists as potential treatment for psychostimulant abuse and addiction. Excitatory and Inhibitory Amino Acids'. Role in Drug Addiction and Novel Treatments'. Physical Exercise There is accelerating evidence that physical exercise is a useful treatment for preventing and reducing drug addiction In some individuals, exercise has its own rewarding effects, and a behavioral economic interaction may occur, such that physical and social rewards of exercise can substitute for the rewarding effects of drug abuse. The value of this form of treatment for drug addiction in laboratory animals and humans is that exercise, if it can substitute for the rewarding effects of drugs, could be self-maintained over an extended period of time. Work to date in \\\\\\\\\\\\\\[laboratory animals and humans\\\\\\\\\\\\\\] regarding exercise as a treatment for drug addiction supports this hypothesis. Animal and human research on physical exercise as a treatment for stimulant addiction indicates that this is one of the most promising treatments on the horizon. Implications of the effects produced in brain vasculature and peripheral organs to forebrain neurotoxicity'. The hyperthermia and the hypertension produced by high doses amphetamines are a primary cause of transient breakdowns in the blood-brain barrier BBB resulting in concomitant regional neurodegeneration and neuroinflammation in laboratory animals. In animal models that evaluate the neurotoxicity of AMPH and METH, it is quite clear that hyperthermia is one of the essential components necessary for the production of histological signs of dopamine terminal damage and neurodegeneration in cortex, striatum, thalamus and hippocampus. Direct toxic damage to vessels seems unlikely because of the dilution that occurs before the drug reaches the cerebral circulation. Reinforcement and addictive disorders'. Unlike cocaine and amphetamine, methamphetamine is directly toxic to midbrain dopamine neurons. A Handbook on Drug and Alcohol Abuse: The Biomedical Aspects 2nd ed. In this context, controlled double-blind studies in children are of interest, which showed positive effects of zinc \\\\\\\\\\\\\\[supplementation\\\\\\\\\\\\\\] on symptoms of ADHD \\\\\\\\\\\\\\[,\\\\\\\\\\\\\\]. It should be stated that at this time \\\\\\\\\\\\\\[supplementation\\\\\\\\\\\\\\] with zinc is not integrated in any ADHD treatment algorithm. They did not confirm the predicted straightforward relationship between uptake and release, but rather that some compounds including AMPH were better releasers than substrates for uptake. Zinc, moreover, stimulates efflux of intracellular \\\\\\\\\\\\\\[3H\\\\\\\\\\\\\\]DA despite its concomitant inhibition of uptake Scholze et al. Despite the challenges in determining synaptic vesicle pH, the proton gradient across the vesicle membrane is of fundamental importance for its function. Exposure of isolated catecholamine vesicles to protonophores collapses the pH gradient and rapidly redistributes transmitter from inside to outside the vesicle. Amphetamine and its derivatives like methamphetamine are weak base compounds that are the only widely used class of drugs known to elicit transmitter release by a non-exocytic mechanism. As substrates for both DAT and VMAT, amphetamines can be taken up to the cytosol and then sequestered in vesicles, where they act to collapse the vesicular pH gradient. Three important new aspects of TAs action have recently emerged: Retrieved 29 May AMPH also increases intracellular calcium Gnegy et al. AMPH and METH also stimulate DA efflux, which is thought to be a crucial element in their addictive properties \\\\\\\\\\\\\\[80\\\\\\\\\\\\\\], although the mechanisms do not appear to be identical for each drug \\\\\\\\\\\\\\[81\\\\\\\\\\\\\\]. International Union of Basic and Clinical Pharmacology. Retrieved 8 December Retrieved 13 November Amphetamine modulates excitatory neurotransmission through endocytosis of the glutamate transporter EAAT3 in dopamine neurons. The physiological importance of CART was further substantiated in numerous human studies demonstrating a role of CART in both feeding and psychostimulant addiction. Colocalization studies also support a role for CART in the actions of psychostimulants. Several studies on CART cocaine- and amphetamine-regulated transcript -peptide-induced cell signalling have demonstrated that CART peptides activate at least three signalling mechanisms. Retrieved 4 May Retrieved 24 February More recently, Colasanti and colleagues reported that a pharmacologically induced elevation in endogenous opioid release reduced \\\\\\\\\\\\\\[ 11 C\\\\\\\\\\\\\\]carfentanil binding in several regions of the human brain, including the basal ganglia, frontal cortex, and thalamus Colasanti et al. Oral administration of d-amphetamine, 0. The results were confirmed in another group of subjects Mick et al. However, Guterstam and colleagues observed no change in \\\\\\\\\\\\\\[ 11 C\\\\\\\\\\\\\\]carfentanil binding when d-amphetamine, 0. It has been hypothesized that this discrepancy may be related to delayed increases in extracellular opioid peptide concentrations following amphetamine-evoked monoamine release Colasanti et al. Similar MOR activation patterns were reported during positive mood induced by an amusing video clip Koepp et al. Amphetamine, Psychotogen, and Marihuana Dependence. Berlin, Germany; Heidelberg, Germany: Retrieved 4 December Recommendations for trace amine receptor nomenclature'. Retrieved 10 July Retrieved 15 October Retrieved 12 October Hydroxyamphetamine was administered orally to five human subjects The lack of effect of administration of neomycin to one patient indicates that the hydroxylation occurs in body tissues. Unfortunately, at the present time one cannot be completely certain that the hydroxylation of hydroxyamphetamine in vivo is accomplished by the same enzyme which converts dopamine to noradrenaline. Glycine conjugation of benzoic acid. The glycine conjugation pathway consists of two steps. CoA ligases and requires energy in the form of ATP. In addition to the factors listed in the boxes, the levels of ATP, CoASH, and glycine may influence the overall rate of the glycine conjugation pathway. Relationship to hypertension and sympathetic activity'. The percent of the drug hydroxylated to hydroxynorephedrine was comparable in all subjects 6. In species where aromatic hydroxylation of amphetamine is the major metabolic pathway, p -hydroxyamphetamine POH and p -hydroxynorephedrine PHN may contribute to the pharmacological profile of the parent drug. Following systemic administration of amphetamine to rats, POH has been found in urine and in plasma. Retrieved 8 November Vermont Department of Health. Retrieved 29 January Northwest Association of Forensic Scientists. Retrieved 6 December United Nations Office on Drugs and Crime. Retrieved 14 October The Art of Drug Synthesis. Technical Assistance Publication Series Code of Federal Regulations Title Subchapter D — Drugs for human use. Retrieved 7 March Topical nasal decongestants -- i For products containing levmetamfetamine identified in The product delivers in each milliliters of air 0. Retrieved 2 January Disposition of Toxic Drugs and Chemicals in Man 9th ed. Precursor compounds to amphetamine and methamphetamine'. World Drug Report pdf. Retrieved 1 August Alcohol and Drug Misuse: A Handbook for Students and Health Professionals. Archived from the original on 2 March Archived from the original on 14 February Retrieved 18 March Internet Journal of Criminology. Archived from the original PDF on 13 July Retrieved 25 May Retrieved 18 August Trends and developments' PDF. International Narcotics Control Board. Archived from the original PDF on 5 December Retrieved 19 November Retrieved 14 November Japanese Ministry of Health, Labour and Welfare. Retrieved 3 November Canadian Justice Laws Website. Archived from the original on 22 November Government of the Netherlands. Retrieved 3 April Australian Government Department of Health. Retrieved 15 December Thailand Food and Drug Administration. Archived from the original PDF on 8 March Home Office, Government of the United Kingdom. Archived from the original on 4 August Retrieved 23 July Retrieved 1 January Retrieved 10 August Retrieved 8 August Retrieved 19 August Human trace amine-associated receptor ligands. SoRI Adrenergic release blockers: Calea zacatechichi Silene capensis. Coffee break Coffeehouse Latte art Tea house. Abuse Date rape drug Impaired driving Drug harmfulness Effects of cannabis Addiction Dependence Prevention Opioid replacement therapy Rehabilitation Responsible use Drug-related crime Fetal alcohol spectrum disorder Long-term effects of cannabis Neurotoxicity Overdose Passive smoking of tobacco or other substances. Alcohol legality Alcohol consumption Anabolic steroid legality Cannabis legality Annual use Lifetime use Cigarette consumption Cocaine legality Cocaine use Methamphetamine legality Opiates use Psilocybin mushrooms legality Salvia legality. Pharmacy and Pharmacology portal Medicine portal Chemistry portal Neuroscience portal Molecular and cell biology portal. Retrieved from ' https: CS1 Japanese-language sources ja Wikipedia indefinitely semi-protected pages Use dmy dates from December Articles with hAudio microformats Articles including recorded pronunciations English Infobox drug articles with non-default infobox title Articles containing potentially dated statements from May All articles containing potentially dated statements Articles containing potentially dated statements from February Articles containing potentially dated statements from PubChem ID CID same as Wikidata PubChem ID CID different from Wikidata Featured articles. Views Read View source View history. In other projects Wikimedia Commons. This page was last edited on 25 October , at By using this site, you agree to the Terms of Use and Privacy Policy. Primarily renal ; pH -dependent range: Abnormal heartbeat High or low blood pressure. Cardiogenic shock heart not pumping enough blood Cerebral hemorrhage bleeding in the brain Circulatory collapse partial or complete failure of the circulatory system. Confusion Abnormally fast reflexes Severe agitation Tremor involuntary muscle twitching. Acute amphetamine psychosis e. Rhabdomyolysis rapid muscle breakdown. Pulmonary edema fluid accumulation in the lungs Pulmonary hypertension high blood pressure in the arteries of the lung Respiratory alkalosis reduced blood CO 2. Painful urination Urinary retention inability to urinate. No urine production Kidney failure. Elevated body temperature Mydriasis dilated pupils. Elevated or low blood potassium Hyperpyrexia extremely elevated core body temperature Metabolic acidosis excessively acidic bodily fluids. Nuclear pore Nuclear membrane Plasma membrane Ca v 1. Following presynaptic dopamine and glutamate co-release by such psychostimulants, \\\\\\\\\\\\\\[\\\\\\\\\\\\\\] \\\\\\\\\\\\\\[\\\\\\\\\\\\\\] postsynaptic receptors for these neurotransmitters trigger internal signaling events through a cAMP-dependent pathway and a calcium-dependent pathway that ultimately result in increased CREB phosphorylation. Psychostimulant conditioned place preference. Reinstatement of drug-seeking behavior. CREB phosphorylation in the nucleus accumbens. Sensitized dopamine response in the nucleus accumbens. Altered striatal dopamine signaling. Altered striatal opioid signaling. Changes in striatal opioid peptides. Number of dendrites in the nucleus accumbens. Dendritic spine density in the nucleus accumbens. The skeletal structure of lisdexamfetamine.
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