Neurotransmitter interactions at the level of monoaminergic cell bodies purchase discount prednisone allergy testing for dogs. Solid lines represent excitatory inputs the activity of the LC are complex proven prednisone 10 mg allergy medicine to take while pregnant, and depend on whether to theraphe nuclei buy genuine prednisone on-line allergy zip code,LC, and VTA;dashed linesrepresent inhibitory drugs used to manipulate the serotonergic system are admin- inputs. In some cases, neurotransmitter inputs may be both direct istered directly into the LC or whether they are administered and indirect via synapses with other neurons projecting to the nuclei. Neurotransmitters inputs shown are only those that are systemically. Systemic administration of 5HT1 and 5HT2 discussed in this chapter. These effects appear to be mediated indirectly, at least in part, rather than by actions at these receptors within the LC (30,57,64). Theoretically, disruption of the activ- by attenuating glutamatergic activation of the LC (8,159). In addition, disruption of serotonergic activity in ingly, neurotoxic destruction of serotonergic terminals re- depression could be secondary to deficient noradrenergic sults in an increase in firing of the LC (71) and increases input to the serotonergic raphe nuclei. That is, disruption in LC mRNA and tyrosine hydroxylase activity (71). Based of one monoamine would be expected to result in general on these findings, the overall effect of 5HT release in the monoamine imbalance because of the inter-connectivity be- LC appears to be inhibitory. Hence, the relationship between the The VTA receives afferent projections from 5HT-con- monoamine systems, and between monoamines and other taining axon terminals originating in the dorsal and median neurotransmitter systems suspected of playing a role in raphe nuclei (70). Moreover, 5HT neurons innervate both depression biology, is worthy of discussion. Local application (in the VTA) of agonists rons innervate the serotonergic raphe nuclei and the dopa- at 5-HT1A receptors increases the firing of DA neurons in minergic VTA. Both the dorsal and median raphe nuclei the VTA (6,87) and administration of a 5HT1A receptor receive noradrenergic innervation (15,121). In fact, the rat agonist systemically increases DA release in the medial PFC dorsal raphe receives one of the richest noradrenergic inner- (7). Microinfusion of 5HT into the VTA in rats results in vations in the brain (15,89,150). Overall, NE appears to an increased release of DA in the NAC (61). It is tempting be excitatory at serotonergic raphe neurons. For example, to speculate that the firing mode of VTA DA neurons is interruption of noradrenergic transmission by systemic ad- dependent, among other factors, on the activity of seroto- ministration of an -adrenoceptor antagonist or iontopho- nergic terminals originating in the raphe. Because 5HT in- retic application of an -adrenoceptor antagonist in the vi- creases extracellular DA (128), a serotonergic deficit, which cinity of serotonergic neurons completely suppresses their has been suggested as one primary abnormality in depres- spontaneous firing (14). Iontophoretic application of NE sion, would also lead to a DA deficit. Chapter 73: Neurocircuitry of Mood Disorders 1057 High levels of DA are found in the dorsal raphe and LC effects of intracerebroventricularly administered CRF on (89). Moreover, D2 receptors and D2 receptor mRNA are striatal 5HT release are biphasic (140). Lesions of the VTA cause decrease 5HT release in the striatum, whereas high doses LC DA levels to fall by about 50%. Price and associates (140) suggest that is important for the rewarding effects of LC stimulation, CRF has predominantly inhibitory actions at the level of without which such stimulation appears to be aversive (41). Hence, a putative hypersecretion of CRF in major In the dorsal raphe nuclei, a moderate number of DA- depression could contribute to the deficit in serotonergic immunoreactive fibers cover rather homogenously all subdi- transmission at the level of the raphe nuclei. It has been postulated that dopa- The VTA is densely innervated by CRF-positive fibers, minergic neurotransmission to the dorsal raphe inhibits the whereas the substantia nigra receives only scattered CRF activity of dorsal raphe neurons by increasing extracellular innervation (11). Intracerebroventricular administration of concentrations of 5HT in the dorsal raphe and, conse- CRF to mice produces behavioral activation and a 'stress- quently, by increasing somatodendritic 5HT autoreceptor like' increase in DA metabolism in several brain regions. Direct injections of CRF into the VTA produces dose-de- pendent increase in locomotor activity, an affect that is not antagonized by the DA receptor blocker, haloperidol (74). Monoamine Systems and Other Intracerebroventricular or intraperitoneal administration of Neurotransmitters low doses of CRF increases DA and DA metabolite levels in the rat medial prefrontal cortex (84). Together, these CRF findings suggest that CRF exerts an excitatory action in the Much evidence has accumulated implicating a state of CRF VTA. The long-term effects of CRF administration on DA hypersecretion in major depression (112,113,125). The LC receives excita- tory CRF input from several sources, and these afferents Substance P appear to be topographically organized with respect to the type of information conveyed (177). The LC also receives been questions regarding their efficacy (45). Interestingly, CRF input from limbic brain regions, including the central there is a relatively dense network of substance P immunore- nucleus of the amygdala, as well as the bed nucleus of the active fibers in the human LC and surrounding regions (50). These Many of these fibers may originate from the nucleus of limbic CRF neurons project to the peri-cerulea area, and the solitary tract (50,100,145). In addition, there is a high in particular to the rostrolateral peri-LC. CRF terminals density of binding of radiolabeled substance P to neuroki- form direct contacts with noradrenergic dendrites (176). Substance P potently stimu- CRF, injected intracerebroventrically or directly into the lates the firing of LC neurons (62). There is considerable LC, activates LC neurons and enhances release of NE in evidence that substance P plays a role in the central response projection areas (163). Internal and external stressors are to stress (13,65). Interestingly, substance P antagonists (in known to activate the LC via CRF, including colonic disten- particular, selective neurokinin-1 receptor antagonists), sion, hypotensive challenge, and foot shock. The ability of when administered intracerebroventricularly, attenuate re- these stressors to activate the LC is blocked by CRF antago- straint stress-induced biochemical indices of LC activation nists (32,85,104,174). Repeated administration of rats with antidepressant CRF projections to the LC are thought to coordinate cogni- drugs (perhaps not all types) down-regulates substance P in tive and autonomic responses to internal physiologic chal- several brain regions (27,158). Interestingly, administration of a CRF antagonist respectively (12,155). Substance P-containing serotonergic blocks stress-induced increases in LC tyrosine hydroxylase neurons are not randomly located within the raphe nuclei, (104), an effect shared by antidepressant drugs (105). CRF terminals in raphe nuclei originate from local dorsal raphe nuclei also receive innervation from substance and distant cell bodies (148,151). The effects of CRF on P-containing neurons with cell bodies occurring outside the raphe firing are complex (77). At low doses, CRF produces region of the raphe (92). There is a high density of substance primarily inhibitory effects on raphe discharge.
As the latter odds ratios illness studies have evaluated the effects of chronic condi are generally larger than the former buy prednisone from india allergy testing columbia mo, there must be comor tions on work role functioning quality prednisone 20mg allergy symptoms to kefir. Most of these studies focus bidities between the persistence of anxiety disorders and the on physical disorders (e order prednisone line allergy symptoms like flu. Most of those concerned persistence of other disorders. Asmall Several different possible explanations exist for these number of recent studies examined the effects of anxiety comorbidities. One is that prior history of other mental disorders on work functioning and found that these effects disorders might be associated, either as a risk factor or as a are quite substantial. These findings are an important ele marker, with risk of the subsequent onset and persistence ment in the argument that anxiety disorders are among the of anxiety disorders. The other is that anxiety disorders most costly of all chronic conditions. As briefly mentioned above, effects of individual mental disorders on work loss (missing epidemiologic studies have found that the latter possibility a full day of work) and work cutback (either missing part is more consistent with the data. Comorbid anxiety disor- Chapter 67: The Economic Burden of Anxiety and Stress Disorders 987 TABLE 67. COMORBIDITIES (ODDS RATIOS) BETWEEN DSM-III-R ANXIETY DISORDERS AND OTHER MENTAL DISORDERS ASSESSED IN THE NATIONAL COMORBIDITY SURVEY Panic Disorder Phobias GAD PTSD Lifetime comorbidities Major depression 6. DSM-III-R, Diagnostic and Statistical Manual of Mental Disorders, third edition–revised; GAD, generalized anxiety disorder; PTSD, posttraumatic stress disorder. Six-month nonaffective psychosis (NAP) was too rare to calculate odds-ratios with any of the anxiety disorders. In addition, survival analyses show that costly of all mental disorders (5). Yet epidemiologic data temporally primary anxiety disorders are powerful predic show that close to half of all cases of depression are second tors of the subsequent onset and course of other mental ary to one or more preexisting anxiety disorders (57). In addition, panic disorder (53) and PTSD priority of anxiety over depression is never taken into con (54) are powerful predictors of suicidal behaviors. Indeed, in It is not clear from these results that anxiety disorders those few instances where anxiety-depression comorbidity are causal. Another possibility is that anxiety disorders are is considered, diagnostic hierarchy rules typically specify early outcomes of other causal factors, either environmental that the depression should be considered primary even or genetic, that cause both anxiety disorders and the other though epidemiologic evidence consistently shows that anx mental disorders with which anxiety disorders are comorbid. To the extent that anxiety disorders are causal, the adverse The rationale for this hierarchy of depression over anxiety effects of mental disorders that are secondary to anxiety is usually that the impairments associated with such cases disorders should be counted among the adverse conse is thought to be due to the depression rather than to the quences of anxiety disorders. Agood case in point is second anxiety (58), but available evidence argues against this claim. Epidemiologic data show that Agood case in point involves comorbidity between GAD early-onset anxiety disorders are significant predictors of and depression. If these associations are causal, simulations suggest that the early intervention and success GAD without major depression is as important as major ful treatment of anxiety disorders would prevent as many depression without GAD in leading to impairments in role as one-fourth of all substance use disorders in the U. Further analysis of these data showed that The component of the costs of substance use disorders due impairment is considerably higher among people with com to prior anxiety disorders, therefore, should be counted orbid GAD and major depression than those with either among the costs of anxiety in a comprehensive evaluation. Coupling the fact Whether anxiety disorders are causal and to what extent that GAD is temporally primary in the majority of these is an especially important issue in the case of depression, cases with the fact that GAD without major depression is as many comparative cost-of-illness studies, including the associated with impairments equal to those of major depres- 988 TABLE 67. THE EFFECTS (ODDS RATIOS) OF 12-MONTH GENERALIZED ANXIETY DISORDER (GAD) WITHOUT MAJOR DEPRESSION (MD) AND MAJOR DEPRESSION WITHOUT GAD IN PREDICTING IMPAIRMENTS IN TWO U. NATIONAL SURVEYS, CONTROLLING FOR SOCIODEMOGRAPHICS AND OTHER 12-MONTH DSM-III-R DISORDERSa GAD Without Major Depression GAD Without MD Major Depression (MD) (MD) Without GAD vs. MD Without GAD Survey 1 Survey 2 Survey 1 Survey 2 Survey 1 Survey 2 Fair/poor 6. Results are based on separate regression equations evaluating the effect of either GAD or MD in predicting one of the impairment measures in one of the samples controlling for sociodemographic variables (age, gender, education, race-ethnicity, employment status, marital status, and urbanicity) and other 12-month DSM-III-R disorders. Models in the first two columns evaluate the effect of 12-month GAD on the subsample of respondents who did not have 12-month major depression. Models in the middle two columns evaluate the effect of 12-month major depression on the subsample of respondents who did not have 12-month GAD. Models in the last two columns evaluate the relative impairments of GAD without MD versus MD without GAD in analyses that are confined to respondents in those two subsamples. Impairment in pure and comorbid generalized anxiety disorder and major depression in two national surveys. American Journal of Psychiatry 1999; 156:1915–1923, with permission. As shown in the PHYSICAL COMORBIDITY table, all but one of the odds ratios are greater than 1. In some general cases, such as the strong association of some anxiety disor- TABLE 67. COMORBIDITIES (ODDS RATIOS) BETWEEN 12-MONTH PREVALENCES OF DSM-III-R ANXIETY DISORDERS AND CHRONIC PHYSICAL DISORDERS IN THE NATIONAL COMORBIDITY SURVEY Panic Simple Social GAD Disorder Phobia Phobia Agoraphobia PTSD Arthritis 1. Chapter 67: The Economic Burden of Anxiety and Stress Disorders 989 ders with ulcers, the most plausible interpretation is that ing, school failure), so it is important that treatment occur anxiety had a causal impact on the subsequent onset of the early in the course of the anxiety disorder. In other cases, it is equally plausible that ders have early ages of onset, initial treatment must occur the physical condition helped promote the subsequent onset during childhood or adolescence to be maximally effective of anxiety. It is also possible that bidirectional causal influ in preventing adverse effects. The eventual resolution of this uncertainty is investigated speed of initial treatment contact after first important for an evaluation of the costs of anxiety disorders, onset of anxiety disorders (67,68). These studies considered as both the direct treatment costs and the indirect costs of three anxiety disorders: GAD, panic disorder, and phobias. Median delays between important because of evidence that anxiety disorders reduce first onset and initial treatment contact were found to be the quality of life of patients with physical disorders (62) more than a decade for some anxiety disorders. Further- and complicate the expression and course of physical disease more, delays were found to be inversely related to age at (63). The most plausible explanation for these findings is onset. This possibility active anxiety disorders receives treatment in a given year. Only about one out of every four people with an anxiety disorder sought any type MENTAL HEALTH TREATMENT of treatment and only 13. Effective psychological (65) and pharmacologic (66) thera pies exist for the treatment of most anxiety disorders. The indirect costs of anxiety disorders would consequently be INAPPROPRIATE USE OF GENERAL expected to decline if a high proportion of people with these MEDICAL SERVICES disorders sought treatment. However, a substantial part of the adverse effects of anxiety disorders are associated with Although anxiety disorders typically are not treated, it is a secondary effects that occur early in life (e. American Journal of Psychiatry 1999;156:117, with permission. Indeed, people with un high prevalence, early age at onset, high chronicity, and treated anxiety disorders make up a large proportion of the substantial role impairment. Although our knowledge about people who overuse primary care for only vaguely defined the comparative costs of different illnesses is too primitive physical complaints (69,70).
With a decision analysis model to compare outcomes and costs regard to parameter uncertainty (the term parameter refers order prednisone 5mg mastercard allergy symptoms loss of voice, of treating major depression with an SSRI buy prednisone 10 mg visa allergy symptoms to penicillin, a TCA order 20mg prednisone with mastercard allergy shots one time, or sero- for example, to estimates of probabilities or cost or health tonin norepinephrine reuptake inhibitor (SNRI). The per- outcome), univariate analysis alone is often inadequate, and spective of the study was that of a national health care sys- some attempt at multivariate evaluation is desirable. There tem, and the clinical outcomes data used in the model were are different formal approaches to evaluation of cost-effec- derived from published meta-analyses. The analysis found tiveness uncertainty using either frequentist or Bayesian ap- that the SSRI and TCA had comparable efficacy but dissim- proaches to generation of confidence (or 'credible') re- ilar tolerance profiles and that the SNRI had both efficacy gions, including simulation and the delta method. Model and tolerance advantages compared to the SSRI. Direct cost structure uncertainty refers to the separate uncertainty about data (hospitalization, medication, physician visits, and labo- the manner in which parameters should properly be com- ratory tests) and the efficacy data from the model were en- bined (e. The decision tree analysis pro- fects additive or multiplicative? An approach to evaluation vided estimates of the expected cost of treatment per Chapter 39: The Role of Pharmaceuticals in Mental Health Care Outcomes 531 depressive episode that could be used by the health service terns of care experienced by most patients. As a result, real-world effects can be Data Sources difficult to extrapolate from ordinary clinical trials. This Data for pharmaceutical outcomes studies can come from issue is discussed further below. Many pharmaceutical companies routinely differentiate the SSRIs and TCAs, except for their side- include pharmaceutical outcome (other than just clinical) effect profiles. However, SSRIs may have some advantage measurements in their development trials. In addition, post- over TCAs in the primary care practice setting (6,28,29). Each of these sources of data ceutical outcomes of interest for a given product are expen- and type of experimentation affect the degree of evidence sive, and data collection of all relevant information is diffi- obtained. Therefore, many pharmaceutical outcome studies mental health care requires careful consideration of the contribute to the body of knowledge by evaluating compo- source and strength of the evidence presented. Additionally, many pharmaco- economic analyses are based on models. These models typi- cally use published literature, expert opinion, or data from HUMANISTIC MEASURES administrative or encounter databases to get information on probabilities and costs. Humanistic measures assess how disease or treatment affects The impact of this component approach to building an patients. Humanistic measures are most important from the understanding of pharmaceutical outcomes is that data perspective of the patient. A primary goal for treatment of come from many sources ranging from experimental and any disease should be for patients to function normally, nonexperimental research designs to expert opinion and have an acceptable quality of life, and be satisfied with their models based on data from multiple and frequently diverse treatment. This is especially true for mental health disorders sources. Therefore, when reviewing pharmaceutical out- where impacts on both physical and social functioning may comes research, it is critical to understand the potential be significant. In many cases, patients and their friends and impact of the source of information on the results. Until A frequent source of outcomes data in mental health recently, humanistic measures have taken a back seat to research is randomized clinical trials conducted by the phar- traditional clinical measures and to some extent economic maceutical industry. This is in part due to greater variability from controlled and typically contain (as expected) mostly clinical patient self-reported measures compared to standard clinical information. In mental health, however, patient self-re- measures (34). The development of valid and reliable instru- ported items (i. There are also many studies that rely on chart review mon conceptualization of humanistic outcomes used in the and quasi-experimentation to document differences in re- evaluation of pharmaceuticals is health-related quality of source use for patients using various pharmaceutical agents. Examples include recent comparisons of tricyclic antide- Health-related quality of life encompasses factors such pressants and SSRIs, and atypical versus conventional anti- as functional status, physiologic status, social and emotional psychotic agents. Many of these studies were retrospective well-being, and life satisfaction (35). Health-related quality and were conducted through chart reviews or administrative of life information allows health care providers and payers data using quasi-experimental techniques. Finally, eco- to make decisions based not only on clinical effectiveness, nomic models have been built using published data or expert or costs but also on effects that are important to patients. Measurement of health-related quality of life may be espe- Historically, randomized controlled trials have been the cially important in chronic diseases for which we have no 'gold standard' (5). There are many humanistic measures available for as- and safety of a drug to be established. Unfortunately, some sessing mental health disorders. Generic and disease-specific of the strengths of such studies can also be a source of less instruments are available for a variety of disorders. This is a result of the sion of every instrument is not feasible; however, a few ex- artificial treatment environment purposefully created in effi- amples are provided. One of the most widely used generic health- 532 Neuropsychopharmacology: The Fifth Generation of Progress related quality of life instruments is the Medical Outcomes depression when comparing treatment groups (46). The MOS SF-36 cap- studies have evaluated health-related quality of life in the tures eight dimensions of health-related quality of life: phys- treatment of depression and utilized similar generic rating ical functioning, role limitations due to physical function- scales (47). However, there is a lack of understanding health (36). The tools assess functions such as daily activities, focus on dimensions that are most relevant to the particular memory, emotional well-being, and other aspects such as disease and are therefore more sensitive to subtle changes finances (48). Examples of disease specific One other area of humanistic measurement concerns the instruments used in schizophrenia include the Quality of relationship between humanistic and economic outcomes. Several review papers have utilities to combine cost information with patient prefer- been published on the use of quality of life instruments in ences. Utilities are usually measured by three techniques: mental health conditions (40–42). These articles highlight rating scales, the standard gamble, or time trade-off tech- that quality of life measurement in mental health condi- nique (49). Utility scores differ from quality of life measure- tions, and in particular specific drug comparison, is a devel- ments. While some quality of life instruments can be used oping science. Many of the available studies are observa- to capture utilities, most cannot. Utilities are a measure of tional or cross-sectional. However, quality of life overall patient well-being that lie on a scale between 0and measurement is increasingly being built into clinical trials. Unfortunately, utility values are difficult and expen- ment of instrument validity and reliability. They require detailed patient interviews articles have shown that it is possible for patients with severe with large numbers of subjects with and without the disease.
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Maladaptive behav- ing imprecise tools for selective in vivo manipulation of cell iors include those identified as criteria for addiction in the biology. Moreover, this problem is compounded by the fact DSM-IV. In general what most psychiatric metrics describe that the neuroadaptations associated with use of a drug of as addiction associated behaviors is the emergence of behav- abuse are not entirely predicated on the pharmacology of iors to obtain drug reward at the expense of engaging in the drug.