Professionals' perception on the management of patients with dual disorders.

BACKGROUND: There is a need to evaluate the professionals' perception about the consequences of the lack of therapeutic adherence in the evolution of patients with co-occurring disorders.
METHODS: An online survey, released on the Socidrogalcohol [Spanish Scientific Society for Research on Alcohol, Alcoholism and other Drug Addictions] and Sociedad Española de Patología Dual [the Spanish Society of Dual Pathology] web pages, was answered by 250 professionals who work in different types of Spanish health centers where dual diagnosis patients are assisted.
RESULTS: Most professionals perceived the existence of noncompliance among dual diagnosis patients. Almost all of these professionals (99%) perceived that noncompliance leads to a worsening of the progression of the patient's disorder, in both the exacerbation of mental disorders and the consumption of addictive substances. Most of the professionals (69.2%) considered therapeutic alliance as the main aspect to take into account to improve the prognosis in this population. The primary purpose of treatment must be the improvement of psychotic-phase positive symptoms, followed by the control of behavior disorders, reduction of craving, improvement of social and personal performances, and reduction of psychotic-phase negative symptoms.
CONCLUSION: Most professionals perceived low adherence among dual diagnosis patients. This lack of adherence is associated with a worsening of their disease evolution, which is reflected in exacerbations of the psychopathology and relapse in substance use. Therefore, we propose to identify strategies to improve adherence.

Introduction

Dual disorders (DDs)/dual pathology/co-occurring disorders are the terms commonly accepted within the mental health field to refer to patients suffering from an addictive disorder and other mental disorders. DDs can occur simultaneously or, even more importantly, sequentially throughout their life span1–4 and constitute a serious problem for the public health.5,6

Up to 70% of individuals who have been diagnosed with a substance use disorder (SUD) show a lifetime disorder, that is, a second psychiatric diagnosis throughout their life,7 and 50% of the patients diagnosed with a mental disorder have a history of substance use.8–11 In Spain, the prevalence rate of population with a mental disorder associated with SUD ranges between 25% and 70%.12–14 This percentage varies depending on the research methodology and, especially, the health care center where the study was conducted.15,16

Lifetime diagnoses of any mental disorder, and particularly personality disorders and psychotic disorders, were found to be associated with higher prevalence of transition from substance use to SUDs across most categories of substances.17

This prevalence is higher when tobacco is included and is considered a potentially addictive substance.9 Moreover, even though it is widely accepted that the prevalence of DDs is significantly higher in men,18 the increasingly high number of diagnosed females in SUD treatment units19 has raised controversy.20

Underreporting of substance use is common in individuals with severe psychiatric disorders,19 and the majority of the studies that have investigated this did not include tobacco.

The dual diagnosis patients’ level of insight (patient’s awareness) of their psychotic disorder, as occurs with SUD, is low.21 Furthermore, the lack of insight is independent of the used substance, whether it is alcohol, which is used very frequently,11,22 cocaine,23 or cannabis.24 Low insight and high polymedication25 are the main causes of low therapeutic adherence, particularly in patients with psychosis,26–28 increasing the suicide risk.29 There is evidence of the relationship between a patient’s level of insight of his/her disorder and treatment compliance.30,31

A study conducted by Roncero et al27 about health care professionals’ perception suggests that ~70% of dual diagnosis patients do not properly comply with their treatment. This percentage is significantly higher than that observed in patients diagnosed with only one mental disorder,32,33 whereas treatment adherence must be improved.34 Furthermore, the lack of adherence results in negative prognostic implications,35,36 which are even more significant in the dual diagnosis population than in other populations with other mental disorders.37

There are limited health resources for the approach to DDs in Spain, which confirms the need for additional efforts and strategies for the treatment of individuals suffering from comorbid disorders.38,39 Among other aspects, there is a need for the creation of a register with clear information on the resources available for this group of patients in Spain,40 as well as the enhancement of nonpharmacologic therapies.41,42

Few studies exist on the perception of the management of pharmacological treatment, where different health professionals27 or specific groups of professionals who assist patients suffering from mental disorders43,44 or DD patients45 are included. Nevertheless, information on professionals’ attitude and perception is an important factor to improve the management of schizophrenic or dual diagnosis patients43,46 and may also help to improve the negative prognostic implications that are a consequence of noncompliance, optimize the implementation of health and social resources, and produce consensus and protocols to manage this population.12,35

The aims of the present study are the evaluation of Spanish professionals’ perception about the level of compliance, the factors affecting prognosis and therapeutic adherence, the rate of use of different pharmacologic strategies, and the training of our professionals in this field. Thus, we can expect a perception of low adherence among the participants and also low awareness of the negative consequences associated with noncompliance among the affected patients. On this basis, the recommendation of specific strategies to improve this situation can be developed.

Methodology

Study design

After a thorough review of the literature, a group of clinical and academic experts on DDs (Table 1) designed a survey on adherence and the consequences of therapeutic noncompliance in dual diagnosis (annexed survey).

Table 1

List of clinical and academic experts on DDs

Carlos Roncero MD	Addiction and Dual Diagnosis Unit, Vall d’Hebron University Hospital – Public Health Agency, Barcelona (ASPB), CIBERSAM, Autonomous University of Barcelona, Barcelona, Spain
Néstor Szerman MD	Gregorio Marañón University General Hospital, Madrid, Spain
Antonio Terán MD	San Juan de Dios Health Care Center, Palencia, Spain
Carlos Pino MD	Pontevedra City Council Drug Dependence Service, Galician Health Service (Xunta de Galicia), Spain
José María Vázquez MD	Outpatient Drug Clinic Sants, ASPB, Spain
Miguel Casas MD	Addiction and Dual Diagnosis Unit, Vall d’Hebron University Hospital – ASPB, CIBERSAM, Autonomous University of Barcelona, Barcelona, Spain

Abbreviation: DD, dual disorder.

This online survey, which was open to any professional involved in dual diagnosis assistance who wanted to participate, was made available through the institutional websites of two scientific societies (the Spanish Society of Dual Pathology [SEPD]; www.patologiadual.es and the Spanish Scientific Society for Research on Alcohol, Alcoholism and other Drug Addic tions [Sociodrogalcohol]; http://www.socidrogalcohol.org) and was answered between October 1, 2013 and December 31, 2013.

Sample

The survey was answered by 250 professionals from the following care centers: outpatient drug clinics (47.2%), mental health centers (25.2%), psychiatric hospitalization units (11.2%), inpatient drug addiction units (7.2%), private centers (6.8%), and primary care centers (2.4%).

Most of the professionals (68.3%) who participated in the survey were members of scientific societies, mainly the SEPD (56.6%) and Socidrogalcohol (20.1%). A total of 54.0% of the participants were women, and 90.0% were Spaniards. Most participants (60.0%) were older than 45 years.

In all, 57.2% of the total number of participants had >15 years of clinical experience. Most of the professionals (67.2%) were working in specialized addiction care units when participating in the survey (Table 2).

Table 2

Professionals who participated in the survey

Professionals	Percentage
Psychiatrist in addiction units	18.8
Psychiatrist in mental health	27.6
General practitioner	23.2
Resident doctor	4.0
Clinical psychologist	15.2
Resident psychologist	0.4
Qualified nurses	2.8
Others	8.0

This study included professionals from every Spanish regions (autonomous communities) except Cantabria and the autonomous cities of Ceuta and Melilla. The communities with a higher number of participants were Andalucía, Madrid, and Catalonia (Table 3).

Table 3

Percentage of participants in different communities

Communities	Percentage
Andalusia	19.2
Aragon	1.6
Balearic Islands	2.0
Canary Islands	6.0
Cantabria	0
Castile-Leon	4.4
Castile-La Mancha	3.6
Catalonia	11.6
Ceuta and Melilla	0
Community of Madrid	18
Community of Navarre	2.8
Valencian Community	8.8
Extremadura	6.0
Galicia	4.8
La Rioja	0.4
Basque Country	5.2
Principality of Asturias	1.2
Region of Murcia	4.4

The 250 participants included in the survey did not receive any economic compensation for completing the questionnaire.

The questionnaire consisted of 41 questions distributed in eight sections: participant sociodemographic profile (nine questions), prevalence (one question), prognosis improvement and therapeutic goals (two questions), use of substances (one question), disease acknowledgment (three questions), therapeutic adherence (six questions), professional continuing education (two questions), and pharmacological strategies (16 questions). The section on pharmacological strategies included seven subsections: psychopharmacologic groups and multiple therapies (three questions), use of antipsychotics (six questions), use of anticonvulsive euthymic drugs (one question), use of antidepressant drugs (one question), use of modulators of the endogenous opioid system (one question), use of benzodiazepines (three questions), and polymedication (one question).

In 15 questions – excluding the eleven questions aimed to define the sociodemographic profiles – the professionals were asked to sort the answers proposed by the researchers on the basis of their importance or frequency of use. A total of 19 questions were responded employing different intervals using Likert scales.

Data analysis

With the requested information, a descriptive statistical analysis was performed using the SPSS Version18 statistical software (SPSS Inc., Chicago, IL, USA).

Results

The 250 survey participants perceived that 40.2% of the patients in their practice are affected with DDs (Table 4).

Table 4

Patients with dual pathology

Patients %	Percentagea
0–10	3.6
10–20	10.4
20–30	17.6
30–40	16.8
40–50	13.6
50–60	12.4
60–70	11.6
70–80	8.4
80–90	4.0
90–100	1.6

Note:

Percentage of professionals who had the corresponding percentage range of patients with dual pathology.

Prognosis improvement

The participants considered that therapeutic alliance is the main aspect to take into account to improve this population’s prognosis (69.2%), followed by proper and maintained compliance (66.0%), patient’s disease awareness (59.2%), and family support (52.4%; Table 5).

Table 5

Important variables in the prognosis of a dual pathology patient (according to the perceptions of the professionals surveyed)

Variables	Percentage
Therapeutic alliance	69.2
Continued and adequate compliance of medication	66.0
Psychoeducational therapy	25.2
Early drug treatment of the disease	15.2
Good tolerability of medication	12.8
Disease awareness	59.2
Family support	52.4

Therapeutic goals

The results of the questionnaire showed that, in the participants’ opinion, the primary treatment goal must be the improvement of the psychotic-phase positive symptoms, followed by the control of behavior disorders, reduction of craving, improvement of social and personal performances, and reduction of psychotic-phase negative symptoms (Table 6).

Table 6

Importance of therapeutic targets

	Overall rank
Improvement of the positive psychotic symptoms	1
Control of behavioral disorders	2
Decreased craving	3
Improved social and personal functioning	4
Improvement of the negative psychotic symptoms	5
Improvement of concomitant affective symptoms	6
Improvement of anxiety disorders	7
Relapse prevention	8

Note: 1, the most important and 8, the least important, according to the perceptions of the professionals surveyed.

Abuse/addiction substances for which treatment is demanded

In the participants’ opinion, alcohol is the substance mostly used by dual diagnosis patients, followed by cocaine, cannabis, benzodiazepines, heroine, and different psycho-stimulants, such as 3,4-methylenedioxymethamphetamine and methamphetamines, among others (Table 7).

Table 7

Substances of abuse/dependence that demand treatment

Substances abused	Overall rank
Alcohol	1
Cocaine	2
Cannabis	3
Benzodiazepines	4
Heroin	5
Other psychostimulants (speed, ecstasy, etc)	6
Tobacco	7
Opioid drugs (not heroin)	8
Pathological gambling	9

Note: 1, the most frequent and 9, the least frequent, according to the perceptions of the professionals surveyed.

Level of disease awareness

In all, 96.0% of the participants in the survey considered that patients have a deficient level of awareness (insight) of their psychotic disease. Moreover, 87.2% of the experts also considered that patients have a deficient level of awareness of addictive diseases and only 10.8% believed that patients are aware of the negative effect of the use of substances on their dual diagnosis (Table 8).

Table 8

Degree of awareness (according to the perceptions of the professionals surveyed)

	Value
	Good awareness	Intermediate awareness	No awareness
Degree of awareness of patients with DD (%)	4.0	67.2	28.8
Degree of knowledge of patients on the worsening of their disease due to substance (%)	10.8	68.4	20.8
Degree of awareness of patients with active disease (%)	12.8	64.0	23.2

Abbreviation: DD, dual disorder.

Treatment compliance

Based on international recommendations,36 a patient is defined as “compliant” when taking ≥80% of their medication, “partially compliant” when the intake of medication is between 40% and 80%, and “noncompliant” when they take <40% of the prescribed treatment. In this respect, 10.8% of the participants stated that their patients are compliant, 63.3% that their patients are partially compliant, and 25.6% that their patients are noncompliant (Figure 1).

Figure 1

Level of treatment compliance.

Hindering pharmacological factors for therapeutic adherence

Regarding the professionals’ clinical experience, the outcomes showed that the association of side effects to the intake of psychiatric drugs is the main explanation for the lack of adherence in this group of patients (Table 9 and Figure 2).

Table 9

Pharmacological factors that hinder treatment adherence

Pharmacological factors	Overall rank
The presence of side effects	1
Inefficiency in controlling symptoms	2
Complicated therapeutic regimens	3
Drug interactions	4
Routes of administration	5

Note: 1, the most important and 5, the least important, according to the perceptions of the professionals surveyed.

Figure 2

Common consequences of therapeutic noncompliance.

Nonpharmacological strategies for adherence improvement

Most professionals (73.5%) affirmed that they are certainly satisfied with the outcomes of the nonpharmacological strategies implemented in their dual diagnosis patients. Moreover, the implementation of motivational strategies and psychoeducation for the patient and family are considered the most important nonpharmacological strategies (Table 10).

Table 10

Nonpharmacological strategies that favor treatment adherence (according to the perceptions of the professionals surveyed)

Nonpharmacological strategies	Overall rank
Motivational strategies	1
Patient and family psychoeducation	2
Monitoring adherence	3
Individualized psychological treatment	4
Simplification of bureaucratic barriers	5
Rehabilitation services	6
Group psychotherapy	7
Level of satisfaction with the nonpharmacological strategies	%
Very satisfied	8.8
Quite satisfied	64.7
Rather dissatisfied	25.7
Not at all satisfied	0.8

Note: 1, the most important and 7, the least important.

Use of pharmacological treatments

The most frequently used drugs for the treatment of dual diagnosis patients are antipsychotics, “commonly used” or “widely used” in 93.2% of the patients; antidepressants (92.0%); and anticraving drugs (73.9%).

In this context, in the participants’ opinion, 2.0% of the patients receive just one drug, as the more common treatment is polymedication. Most of these patients receive a total of three drugs, although almost 25% of the professionals confirmed that they receive four or more different drugs. This is worth highlighting, since polytherapy significantly affects –“very much” according to 73.6% of the surveyed participants and “completely” according to 9.6% of the surveyed participants – the patients’ quality of life (Figure 3).

Figure 3

Treatment of your patients with dual pathology.

Abbreviations: SSRI, selective serotonin reuptake inhibitors; NaSSA, noradrenergic and specific serotonergic antidepressant; SNRI, selective norepinephrine reuptake inhibitor; AP, antipsychotic; NDIR, noradernaline dopamine inhibitor recaptation; MAOI, monoamine oxidase inhibitor.

Consequences of therapeutic noncompliance

The vast majority of the participants in the survey (98.8%) perceived that therapeutic noncompliance worsened the overall course of dual diagnosis patients (Table 11).

Table 11

Degree of deterioration due to therapeutic noncompliance (according to the perceptions of the professionals surveyed)

Degree of deterioration	Percentage
None	0.0
Slightly	1.2
Considerably	40.0
A great deal	58.8

Professionals’ educational background

The most valued training resources were the courses (60.0%), workshops (54.8%), and guidelines (47.2%; Table 12).

Table 12

Tools to improve professional development

Professional development tools	Percentagea
Monographs	22.8
Manuals	26.8
Guides	47.2
Workshops	54.8
Courses	60.0

Note:

Percentage of the professionals who rated the tool as important or very important.

Discussion

Knowing the perception of professionals is very important since, as they are responsible for prescribing and administering the treatment, as well as for the drug efficiency,43,47 they are able to detect noncompliant patients and the consequences resulting from their lack of adherence. Thus, they can also identify the necessary interventions to improve this situation.

Professionals perceived that 40.2% of the patients cared for in different health care settings are affected with DDs. This prevalence is lower than that detected by epidemiologic studies, extending the debate on the underdiagnosis of this disease. In this evaluation, professionals did not usually take into account tobacco, which is also a controversial matter in this field. Nevertheless, the prevalence of DDs may possibly depend on the health care setting where the study is carried out, varying from 24.9% in psychiatric hospitalization units13 and 40% in emergency units34 to 56%–67% in addiction treatment units.14,15 Moreover, the survey results also showed alcohol and cocaine, to a lesser degree, as the most used drugs by the DD patients. These data coincide with the studies conducted without including the evaluation of tobacco.7,16,18

Professionals’ perception on the main therapeutic goals to be achieved to manage dual diagnosis patients should be the improvement of the psychotic-phase positive symptoms, control of behavior disorders, and reduction of craving. These are very important aims, as established by a large number of articles published in the literature.48–50

In the CATIE study,51 60% of the psychotic patients suffered from SUD sometime in their life, without mention of tobacco. Regardless of the accessibility to health care resources, DD patients present a lower degree of therapeutic adherence than those who have been diagnosed with just one mental disorder.35 This coincides with the participants’ perception, which shows that 89.2% of these patients are totally or partially noncompliant. This rate is superior to that observed (68.3%) in previous similar studies carried out in Spain27 with different professionals and in international studies developed exclusively with psychiatrists, varying between 53%43 and 57%.44

Participants adduce the occurrence of adverse effects as the main pharmacologic factor to explain for the low rate of compliance. Likewise, a similar perception is observed when analyzing the patients’52 and professionals’43 opinions. Based on this perception, as concluded in the study performed by Ziedonis et al,42 those drugs that may contribute to poor adherence due to their adverse effects should be avoided. Moreover, regarding the rest of the pharmacologic factors that affect compliance, professionals pointed out the inefficacy in controlling the symptoms and the complexity of some treatment regimens. It should be taken into account that DD patients are often a polymedicated population,25 and in most cases, they receive two or more antipsychotic drugs.53 Therefore, in the professionals’ opinion, the prescription of single-dose regimens should be recommended.27 However, in this study, 98% of the professionals treat their patients with more than one drug and 83.2% with three or more drugs, whereas three is the average number of drugs received by each patient. This is a very important finding, since the majority of the survey respondents perceived that polymedication influences – in varying degrees, “much” or “completely” for 83.2% of the sample – the patients’ quality of life, which is in line with evidence found in the literature.54

Likewise, all participants perceived, as evidenced in numerous studies,55–57 that nonadherence to treatment determines worse evolution in the prognosis of dual diagnosis patients, very significant in up to 98.8% of the cases. This is a similar finding to that observed in the study performed by Roncero et al,27 in which 96.2% of the participants considered that noncompliance is severely or very severely related to poor patient evolution.27 There is a large number of studies that verify that the lack of adherence is directly associated with a worsening of the disorder’s evolution.37,58 It should be taken into account that the population affected with severe mental disorders and SUD presents more severe symptoms of the psychopathology and a higher rate of hospitalization, relapse, violence, and suicide29 (in short, a worse evolution of the disease) than patients with only one diagnosis.58,59 In this context, the participants in this study considered that the worsening of the prognosis is the third most important consequence of noncompliance, only surpassed by an exacerbation of the psychopathology and relapse to substance use.

The difficulties involved in guaranteeing treatment continuity entail a nonnegligible risk of psychopathologic decompensations as well as behavioral ones in DD patients.60 This risk together with the relapse in substance consumption is relevant, as shown by several researchers.61–63 Nonetheless, in the literature, few objective studies have been conducted on the lack of adherence, whereas we cannot know which one of these is the most frequent. This finding was already detected in a previous study performed by Roncero et al,27 in which it was not possible to elucidate whether psychopathologic decompensation is more frequent than relapse in SUD or vice versa.

Noncompliance also involves a worsening of social and family functioning,64 loss in quality of life,65 and an increase in the use of public and private health resources, especially hospitalizations.66 These three situations are considered the fourth, fifth, and sixth most important consequences related to the lack of adherence found in our survey.

To improve patients’ prognosis, the participants mainly assessed the need for therapeutic alliance – 69.2% of the participants. This percentage coincides with the research that concluded that establishing a relationship of cooperation between the patient and professional facilitates the achievement of the therapeutic goals.67,68 They also assessed the need for treatment adherence (66.0%) and patient awareness (insight) of the disease (59.2%). The latter is correlated with the evolution of the disease and also with the level of compliance.69,70 However, only 4% of the professionals perceived that they are well aware of their patients’ psychotic disease, a consideration that in the case of SUD is shared by 12.8% of the professionals. In addition, according to their clinicians’ perception, only 10.8% of the patients are aware of the damage that the use of substances can produce on their psychotic illness. In European studies,43,44 this percentage is 25%.

The survey results also showed the high degree of satisfaction of the professionals with nonpharmacological strategies, emphasizing interventions aimed to optimizing the patient’s level of adherence, motivational strategies, as well as patient and family psychoeducation; interventions with a clearly established efficacy as evidenced by several investigations.71,72 In this context, however, it should be taken into account that between 20% and 70% of the patients who start psychosocial therapies in mental health services do not properly comply with them.73

In relation to different pharmacologic therapies, antipsychotics, antidepressants, and the so-called anticraving drugs are the mostly used. This finding is similar to the results observed in a study conducted in Spain.20 It should be remembered that, in the participants’ opinion, the therapeutic goals in this population should include the management of psychotic symptoms as well as decrease of craving. This also coincides with several studies that concluded that the approach to dual diagnosis patients requires combination therapy for addictive behavior and other mental disorders.35,74 It is not in vain that, among other aspects, the remission of substance dependence or abuse is a critical factor for the proper management of mental disease symptoms.75

The findings of this survey also showed that professionals prefer using atypical antipsychotics to the detriment of conventional neuroleptics, a tendency supported by the efficacy of atypical antipsychotics in the approach to dual diagnosis,76–78 which is significantly higher than the efficacy observed with classical neuroleptics.75,79 Moreover, whereas most patients receive antipsychotic polytherapy, in practically half of the cases, professionals prefer the administration of a maintenance therapy with a long-acting antipsychotic drug. In this context, among other reasons adduced by the participants to explain the need for a treatment with a long-acting antipsychotic, the lack of adherence to daily oral therapies and the lack of awareness of the disease were highlighted. In this respect, it could suggest that this strategy meets the need to improve the current rates of compliance. Moreover, as asserted in the study by van Zaane et al,80 when treating comorbidities, maintaining the treatment as long as possible should always be considered.

The most frequently used antipsychotics by up to 93.2% of the professionals are daily oral olanzapine, quetiapine, extended-release paliperidone, daily oral risperidone, and paliperidone palmitate, all of which have been proved to be effective in the management of dual diagnosed patients.76,77,81,82 In line with this, whenever there is an antipsychotic drug with oral and long-acting administration available, it is important to consider long-acting treatments versus daily intake options, as the first provides a better response in dual diagnosis patients.83 In the professionals’ perception and taking into account the improvement of psychotic-phase positive symptoms, the control of behavior disorders and the decrease of craving are the main therapeutic goals in dual diagnosis patients. Paliperidone palmitate has proven to be the most used long-acting antipsychotic and is perceived as a drug that offers better tolerability than all the other antipsychotics. Its advantages include improving cognition/functioning and a simple route of administration;77 both characteristics are considered to be the main pharmacologic factors required to facilitate therapeutic compliance.

Antidepressants were used by 92% of the participants. The study results showed that professionals preferred using selective serotonin reuptake inhibitors and, to a lesser degree, dual-action drugs such as noradrenergic and specific serotonergic antidepressants. Moreover, 85.2% of the participants affirmed that they prescribe drugs indicated for addiction treatments, especially disulfiram and, less frequently, naltrexone and bupropion, very effective drugs for addiction treatments;84 95.2% prescribe anticonvulsive euthymic drugs, mostly topiramate, to manage their patients, although there is limited evidence about its appropriateness for the treatment of addictions;85 and 72.5% prescribe modulators of the endogenous opioid system for opioid-dependent patients, mainly methadone, the combination of buprenorphine and naloxone, which have been shown useful for dual diagnosis patients.86 In this context, it is important to point out the high prescription rates of benzodiazepines for the population affected with dual diagnosis: 76.4% of the professionals prescribe long half-life benzodiazepines to their patients, a much higher rate than that observed in a previous international study.87 This occurs in spite of the fact that the use of benzodiazepines can increase the risk of abuse potential and therefore generate a new problem with abuse/dependence, as stated in the research performed by Brunette et al.88 This is why careful assessment and close monitoring are recommended in the use of benzodiazepines, if not totally avoided, in dual diagnosis patients.12 Furthermore, professionals also found that 59% of their patients use benzodiazepines for self-medication. This result is consistent with studies in which the use of benzodiazepines without prescription has been evaluated.89,90

Finally, the professional’s education is relevant.46,91 The present study shows that 60% of the participants considered that courses are the main educational tool, followed by workshops and access to clinical practice guidelines. In fact, this appreciation is similar to that observed in previous works focusing on professionals’ perception.27,44

Strengths and limitations

As for the limitations of this study, it should be noted that the participants in this open online survey are highly motivated professionals very interested in participating in a study on DDs. Therefore and since results may not represent the opinion of all of the professionals who care for DD patients, it is necessary to compare the outcomes with the perception of other groups of professionals with a different profile. Also, it has been considered that generally the strength of studies based on open conducting online surveys is not too significant, although the choice of this methodology is supported by numerous previous studies published in the literature.27,43,44

Nevertheless, due to the importance of the professionals’ opinion on health care planning, the relevance of the topic, the number of participants, and the fact that they work in a variety of dual diagnosis patient health care units, these results should be highly valued. Furthermore, due to the few works previously published in the literature on this topic, they should be especially valued.27,43,44

Conclusion

Professionals perceived that most dual diagnosis patients do not comply with the prescribed treatment. This lack of adherence is associated with a worsening of their disease evolution, which is reflected in exacerbations of the psychopathology and relapse in substance consumption. Undoubtedly, these circumstances lead to a worse prognosis; therefore, it is very necessary to implement pharmacologic and nonpharmacologic strategies in order to improve the rate of compliance. Taking into account the main objectives of the surveyed professionals, when treating their patients, one should include not only effective pharmacological therapies for symptom control, with a moderate side effect profile, which have proven to reduce the employment of health care resources and improve the patient’s functioning, but also nonpharmacological therapies, which also improve therapeutic compliance, as these are influential factors for a better prognosis.