The co-occurrence of substance abuse and psychiatric disorders is a well-known fact. The Epidemiological Catchment Area (ECA) study is the largest survey of a general population (n = 20,000). The survey reported lifetime prevalence of alcohol dependence as 13.5%, current prevalence as 4.8%, and a wide range of comorbid psychiatric disorders such as schizophrenia/schizophreniform disorders (1.5%), bipolar affective disorders (1.3%), unipolar depression (8.5%), and anxiety disorders (14.6%) which comprise phobias at 12.6%, agoraphobia at 5.2%, social phobia at 2.8%, simple phobia at 10%, panic disorder at 1.6%, panic disorder with agoraphobia at 0.5%, obsessive-compulsive disorder (OCD) at 2.5%, and antisocial personality disorder 2.6% [1].

The estimated prevalence of dual diagnosis was 30–60% as reported by the National Comorbidity Survey (NCS). The probability of receiving specialized mental health services is higher for people with a comorbid psychiatric disorder and alcohol dependence syndrome (ADS) (41%) than for those who have alcohol abuse or dependence alone (25% and 24%, respectively) [2]. Comorbid mental health and substance use disorders (SUD), commonly referred to as “dual diagnosis” or simply “comorbidity,” are associated with significant economic and human costs. People with comorbidity have been found to be more severely ill, difficult to manage, non-compliant with medication, have fewer social supports and financial resources, and are at a higher risk of medical problems like HIV, hepatitis [3]. The comorbidity tends to co-occur in many patients and is higher than in the general population. This has been noted in both population-based [1, 2, 4, 5] as well as clinic-based studies across the world [6, 7]. Evidence suggests that between 45% and 80% of alcoholics, either in the community [8] or in clinical populations [9, 10], suffer from another psychiatric disorder. Hertz et al. [9] found additional psychopathology in 54% of ADS patients. Among those with comorbid diagnoses, 35% had one, 10% had two, and 55% had three or more diagnoses.

General prevalence of comorbid psychiatric disorders

According to Hesselbrock et al. [11], 66% of patients met criteria for current psychiatric disorder involving other substance abuse (9%), depression (23%), phobia (6%), mania (2%), somatization (1%), and schizophrenia (2%). In a community study, Weiss et al. [10] observed various co-occurring disorders which included major depression (44%), bipolar disorder (6%), generalized anxiety (9%), phobia (3%), and misuse of drugs other than alcohol (12%). Although the institutionalized population represented only 1.3% of the total population, the overall rate of psychopathology was higher than that existing within the community. The lifetime prevalence rate for any substance abuse and mental disorder in the institutionalized population was more than twice that found in the community population [10]. Based on ECA data, the psychiatric comorbidities are as follows: mania 6.2 times more and schizophrenia 4.0 times more. There is only a mild increase in major depressive disorder among alcoholics [12]. Psychiatric comorbidities varied between 40% and 70% in most studies conducted in the last 20 years [9, 13]. Among various comorbidities in male alcoholics, Powell et al. [14] reported 42% major depressive disorder, 20% mania, and 20% anti-social personality disorder.

General prevalence of comorbid psychiatric disorders in Indian population

A meta-analysis of 20 studies estimated the prevalence of psychiatric morbidity in India as 56/1000 population [15]. Baxter et al. [16] reported a prevalence of 0.2% schizophrenia, 0.1% bipolar, 2% depressive disorders, and 0.2% anxiety disorders in the general population. Considering the prevalence of psychiatric comorbidity in SUD, a retrospective study that included 5283 patients found 13.2% dual diagnosis with mood disorder (42.2%) being most common. The most common SUD present in patients with dual diagnosis were alcohol and nicotine followed by opioid [17]. Another retrospective study which included 289 patients with dual diagnosis reported nicotine and alcohol as the most common substances followed by opioid to be associated with comorbidities and MDD being the most commonly reported disorder (24.9%) [18]. Most cross-sectional studies have shown a prevalence rate between 25% and 80% with depression being the most commonly reported disorder [19,20,21,22] in ADS. In a case-control study, prevalence rates of psychiatric comorbidity in ADS and controls were found to be 92% and 12%, respectively. The most common disorders were depression, antisocial personality disorder (ASPD), and phobia [22]. A study by Vohra et al. [23] reported 76.6% comorbid Axis 1 and 40% Axis 2 disorders. The most common was major depression 52.1% followed by dysthymia 13.0%, brief psychotic disorder 13.0%, and alcohol-induced psychotic disorder 0.5%. Among Axis 2 disorders, the most common was cluster B (58.3%) followed by cluster A (16.6%) and cluster C (16.6%). According to Gauba et al. [24], 86.8% had comorbid Axis 1 and Axis 2 disorders. The prevalence of affective disorders was 28.75%, the most common being depressive episode (15%) followed by dysthymia (8.75%), bipolar disorder (2.5%), mania (1.25%), mania with psychotic symptoms (1.25%), and schizophrenia 2.5%. The gender difference between males and females found increased severity of ADS in males whereas more comorbid disorders were reported in females with MDD being the most commonly reported comorbidity in both genders [25].

Prevalence of specific comorbid psychiatric disorders


A 12-month follow-up study by Nunes et al. [26] in patients seeking treatment for both alcohol and depression (n = 110) found that in substance-dependent patients, both DSM-IV primary and substance-induced major depressive disorder (MDD) predicted future depression. Eighty-eight percent of the patients experienced a depressed mood for at least 1 week, and 57% experienced MDD. A study looking at the effect of MDD on the progression of substance dependence found that patients with current substance-induced MDD were less likely to remit from dependence than patients with no baseline MDD. A history of MDD prior to the lifetime onset of substance abuse also reduced the likelihood of remission relative to the absence of such a history. MDD during sustained abstinence predicted dependence relapse after hospital discharge compared with those without MDD [27]. When substance-induced mood disorders are identified, they are likely to disappear soon after abstinence, a situation not seen with independent depressive episodes. Thus, overall continued abstinence in alcoholics is likely to be associated with a decrease in depressive symptoms [28, 29]. In a 1-year follow-up of hospitalized alcohol-dependent male patients (n = 239), 4% developed depressive episodes while drinking heavily, whereas 2.1% demonstrated MDD independent of heavy alcohol intake [30].

Anxiety disorders

A strong association is noted between generalized anxiety disorder (GAD) and substance use disorder (SUD) [30, 31]. High rates of comorbidity of GAD and SUD have been frequently reported in clinical [32] and community [1, 2, 33] samples and have been associated with worse outcomes than independent disorders. Among individuals with alcohol use disorders, those with comorbid anxiety have a greater severity of illness [34] by comparison with those with alcohol use disorders alone, and are more disabled, drink more heavily, have worse social adjustment and outcome and greater number of hospitalization [35]. A long-term follow-up study found that comorbid SUD among individuals with GAD significantly decreased the likelihood of recovery from GAD and significantly increased the risk of recurrence of this disorder [36]. The risk of a comorbid substance use disorder in patients with panic disorder was found to be 2.4 times higher than that in the general population [37]. A study of in-patients with alcohol dependence showed a prevalence of 24.7% social phobia, 30.6% specific phobia, 19.3% generalized anxiety disorder, 5% obsessive-compulsive disorder, 4.6% posttraumatic stress disorder, 2% panic disorder with agoraphobia, and 22.2% any anxiety disorder induced by alcohol [38]. Similarly, Bowen et al. [39] studied a group of 48 in-patient alcoholics finding that 44% had anxiety disorders, 24% had agoraphobia, social and mixed phobias.

Psychotic disorders

Epidemiologic studies have revealed that the odds of having alcohol dependence were 2.7 to 3 times higher in patients with non-affective psychosis [40]. A population-based study (n = 8028) showed that the lifetime prevalence was 0.41% for alcohol-induced psychotic syndrome [41]. Past clinic-based studies have shown that 2–7% of patients with alcohol dependence had alcohol hallucinosis [42] and 5–11% had delirium tremens [42, 43]. Substance use in schizophrenic patients was associated with poor social function, symptom exacerbation, frequent hospitalization, medication noncompliance, and poor treatment response [44].

Bipolar disorder

The ECA data for alcohol abuse/dependence in patients with bipolar I disorder reported a prevalence rate of 46%. In the data from National Epidemiologic Survey on Alcohol and Related Conditions (NESARC) [45], 54% of respondents who met the criteria for bipolar disorder also reported as having alcohol use disorder.

Severity of dependence and association with psychiatric comorbidity

Patients with comorbidity were more likely to suffer from poor health and functional impairment [46] and the progression of alcoholism in patients without comorbidity was significantly milder. Comorbidity was associated with earlier onset of dependence, higher volume of daily alcohol intake, and greater severity of dependence in patients with both Axis 1 and Axis 2 comorbidities [10 ,47–49]. Studies have demonstrated a positive relationship between the severity of alcohol dependence and the prevalence of additional psychiatric symptom patterns [47, 48]. Subodh et al. [49] found a 32.4% prevalence of dual diagnosis in SUD patients with alcohol being the most common substance associated with other comorbidities followed by opioids. Affective disorder was 12.3% followed by anxiety disorder 11.2% and psychotic disorder 5%. Furthermore, this study showed no significant association between the duration of substance use and comorbidity. A study was done on 35 females to demonstrate the relationship between severity of alcohol dependence and the presence of comorbid psychiatric disorder reported 57.14% comorbid Axis 1 disorders. MDD 34% was the most common followed by dysthymia 11%, PTSD 9%, adjustment disorder 8%, and mania 3%. Furthermore, the study found no significant correlation between the age of initiation, regular use, and the severity of dependence with the presence of comorbidity [50]. High rates of psychiatric comorbidity exist in ADS patients yet the extent of the problem is not being addressed in India as there is a paucity of studies focusing on the severity of alcohol dependence and the presence of comorbidity. This study attempts to address this issue and investigate the association between the severity of dependence and psychiatric comorbidity. In this respect, this study differs from previous studies in terms of sample selection where ADS patients alone, i.e., no SUD patients, are selected. Moreover, the sample size in this study was larger than that of previous studies and was drawn from a rural area of southern India.

The objectives

The objectives of this study are the following:

  1. 1.

    To determine the prevalence and type of psychiatric comorbidity in alcohol-dependent in-patients

  2. 2.

    To examine the severity of alcohol dependence and psychiatric comorbidity


Study design

This was a prevalence study conducted for a period of 1 year from 1 January 2016 to 31 December 2016.

Study setting

The study was conducted in the Psychiatry Department (deaddiction unit) at Sri Venkata Swami (SVS) medical college and hospital, Mahbubnagar, Telangana, India. Approval for the study was granted by the scientific ethical committee of SVS medical college and hospital.


The study sample was collected from in-patients at the Psychiatry Department at SVS medical college and hospital and comprised 100 in-patients diagnosed by the primary investigator as ADS as per International Classification of Mental and Behavioural Disorders - Research and Diagnostic Criteria (ICD-10 RDC).

Inclusion criteria

Patients must be aged between 18 and 65 years, fulfill the diagnostic criteria of alcohol dependence of ICD-10 RDC classification, are physically and mentally fit, are willing to complete the necessary questionnaires, and are capable of giving informed consent.

Exclusion criteria

Participants are excluded if they take a psychoactive substance or any medication which can produce cognitive and other psychological defects other than nicotine and caffeine. Also excluded are patients with organic mental disorders and those who did not complete detoxification of at least 2 weeks duration or are in an altered mental state despite detoxification.

The study sample comprised all participants fulfilling the eligibility criteria and willing to take part in the study over the study period of a year.

Study procedure

A consecutive sample of 100 ADS patients admitted in Psychiatry Department at SVS Medical College & Hospital was selected. Inclusion and exclusion criteria were assessed. Informed consent in writing was obtained before patients were included in the study. A data collection sheet was used to record socio-demographic data, general health, and alcohol dependence characteristics like age of initiation of drinking, duration of drinking, frequency of attempts to abstain, and the total duration of abstinence. The English version of the Mini-International Neuropsychiatric Interview (MINI Plus) [51] was used to evaluate previous and current psychiatric disorders, and the diagnosis was confirmed by using ICD-10 RDC after 2 weeks of admission to limit the interference from withdrawal symptoms. Severity of Alcohol Dependence Questionnaire (SADQ) was used to measure the severity of dependence.

Data analysis

Sample size was calculated by the formula N = z2PQ/L2, where N = sample size, Z = 1.96 at 95%CI, P (prevalence) = 8% (occurrence of psychiatric disorders) as found in the study, Q = 100 − 8 = 98%, and L = 6% precision; therefore, N = 3.84 × 97 × 3/6 × 6 = 78.5%, making to near value, considering the 20% non-response rate, and the total sample size taken was 100. The power of the study is 100 − 6 = 94. Data analysis was carried out using the Statistical Package for Social Sciences (SPSS). The data were normally distributed and hence parametric tests were used. All data except age were categorical variables and so t test was done for age and chi-squared test for all other data. The analysis took a p value < 0.05 to be statistically significant.


Most subjects (n = 48) belonged to the age group of 31–45 years, 65% were males and 35% females (Table 1). The majority (47%) belonged to upper lower socioeconomic status. Exactly 54% of the subjects were employed and 46% unemployed (Table 1). In the study population, age, sex, and socio-economic status had no significant influence on the presence or absence of psychiatric comorbidity. Nevertheless, psychiatric comorbidity is significantly greater (p = 0.04) in those who are unemployed than those who were employed (Table 1). Considering the severity of dependence, 48% had mild dependence, and 42% had moderate dependence, while 10% had severe dependence (Table 2 and Fig. 1). Thirty-three percent of the sample was found to have a comorbid psychiatric disorder (Table 3 and Fig. 2). The most common psychiatry comorbidity was mood disorder (18%) followed by anxiety disorder (11%) and psychotic disorder (4%) (Table 4 and Fig. 3). Among the mood disorders, the most common was MDD (8%). GAD at 6% was the most common among the anxiety disorders and brief psychotic disorder at 3% was the most common among psychotic disorders (Table 4 and Fig. 4). A comparison of patients with and without psychiatric comorbidity in relation to alcohol dependence characteristics showed no association with age of initiation of drinking or the frequency or duration of abstinence, although there was a significantly greater occurrence of psychiatric comorbidity (p = 0.03) in those with longer duration of drinking (Table 5). It seemed that psychiatric comorbidity is significantly greater (p = 0.001) in those with a higher severity of alcohol dependence (Table 6 and Fig. 5). However, there existed no such association between this type of comorbidity and severity of dependence (Table 7 and Fig. 6)

Table 1 Sociodemographic data and clinical characteristics of study subjects
Table 2 Distribution among study population based on the severity of alcohol dependence
Fig. 1
figure 1

Severity of alcohol dependence

Table 3 Distribution among study population based on the presence or absence of psychiatric comorbidity
Fig. 2
figure 2

Psychiatric comorbidity

Table 4 Depicting the presence of specific comorbid psychiatric disorder in study subjects
Fig. 3
figure 3

Types of psychiatric comorbidity

Fig. 4
figure 4

Specific psychiatric comorbidities

Table 5 Comparison of patients with and without psychiatric comorbidity in relation with alcohol dependence characteristics
Table 6 Comparison of patients with and without psychiatric comorbidity in relation with the severity of alcohol dependence
Fig. 5
figure 5

Presence of psychiatric comorbidity in relation with the severity of dependence

Table 7 Comparison of types of psychiatric comorbidity in relation with severity of dependence
Fig. 6
figure 6

Relationship between severity of dependence and the presence of specific psychiatric disorder


This study focused on determining the prevalence of psychiatric comorbidity among alcohol-dependent subjects and its association with severity of dependence. The majority of the study subjects (ADS patients) were aged between 31 and 45 years. This was comparable with the Epidemiological Catchment Area (ECA) Study [1] which showed that lifetime prevalence rates for alcoholism tend to peak between ages of 30–44 years. In the sample, 35% patients were female and 65% were male. Large US-based epidemiological studies done by Hasin et al. [33] and Kessler et al. [2] showed higher rates of alcohol dependence in women at 52% and 51%, respectively, when compared with the present study. The reason for this relatively lower prevalence might be cultural prohibitions and reduced liberalization of women in India than in Western countries.

General prevalence of comorbid psychiatric disorders

In the current study, psychiatric comorbidities were present in 33% of the population while the majority of the sample (67%) had no comorbid psychiatric disorders. The current study showed lower rates of comorbidities when compared to other studies that reported a prevalence rate between 25–80% [19,20,21,22]. The psychiatric comorbidity in the current study is comparable to 47% as reported by Singh et al. [22]. The variability in rates of comorbidity in different studies is explained by settings, patient population, assessment tools used, and timing of the diagnostic interviews in relation to withdrawal effects. Moreover, some studies which showed higher rates included Axis 2 disorders which were not included in the present study.

Prevalence of specific comorbid psychiatric disorders

Among the psychiatric disorders, the most common was mood disorder (18%) followed by anxiety disorders (11%) and psychotic disorders (4%). This is consistent with the findings of most studies [14,15,16,17,18,19,20,21]. However, ECA [1] have reported anxiety disorder as the commonest disorder. This contrary finding could be due to the fact that ECA was a community-based study and that these disorders do not present at a hospital.

Mood disorders

Among the mood disorders, the commonest was MDD (8%) which is similar to many Indian studies [17,18,19,20, 22, 23] followed by dysthymic disorder (5%) and bipolar disorders (5%). Earlier Western studies also reported MDD as the most common comorbidity in ADS [10, 14]. However, 8% is less when compared to most studies which reported the prevalence of depressive disorder in a range of 14–42% [18–24], 0.4 to 13% (dysthymia) [9, 10, 24] and 2 to 22% (bipolar disorder) [9, 11, 14, 24].

Anxiety disorders

In the present study, anxiety disorders (11%) were the second most common type of psychiatric comorbidity. The most common anxiety disorder being GAD (6%) followed by adjustment disorder (3%) and panic disorder (2%). Prevalence rates of anxiety disorders in our study were low by comparison with studies by Bowen [39] and Guba et al. [24] which reported 44% and 45%, respectively. However, our findings are comparable to 14% as reported by Singh et al. [22]. Most of the above studies have higher rates than this study which shows a lower prevalence of overall psychiatric comorbidity in the study sample.

Psychotic disorders

In the present study, psychotic disorders were found in 4%. Three percent had brief psychotic disorder and 1% had schizophrenia, which is less when compared to 13% as reported by Vohra et al. [23]. Other studies also have such low rates [1, 2, 11, 24, 25] partly due to the fact that such patient population, despite a higher known association with substance use disorders, is seldom seen in deaddiction settings. We included only those patients who attended our deaddiction unit, many patients with schizophrenia-alcoholism comorbidity might have been attending our general psychiatry department for the treatment of schizophrenia and hence could have been excluded from this study.

Few authors have, however, been skeptical about such high rates of psychiatric comorbidity associated with alcohol seen in the abovementioned studies. A minimum period of 3 weeks abstinence from alcohol appears to be necessary to give consistent dual diagnosis [52].

A study in hospitalized alcoholics found the prevalence of depression in the index episode of alcoholism to be 30.2% when assessed at admission while only 20% of those initially diagnosed as depressed continued to fulfill the criteria for major depression after 10–14 days of abstinence [53]. The rest might have been alcohol-induced affective disorder. Similar results were found among anxiety disorders [54]. In line with considering the distressing psychiatric syndromes among alcoholics as clinically relevant, but temporary conditions, Schuckit et al. [55] used a time-line approach to distinguish psychiatric syndromes that occurred in the context of substance-related disorders from those that appear to have developed independently of alcohol dependence. They found no evidence to suggest that alcoholism was associated with increased rates of independent major depressive disorder (11.5%), OCD (1.3%), or agoraphobia (1.6%) compared to control (15.9%, 0.9%, and 0.9%, respectively). However, alcohol-dependent subjects had a twofold increased risk for bipolar illness (2.3% vs. 1.0%) and threefold risk for panic disorder (4.2% vs. 1.0%) and social phobia (3.2% vs. 1.4%) [55].

The various studies reviewed above had cross-sectional designs and assessments were made after few days of admission (between 5 to 14 days), allowing for the effect of alcohol to subside, and also taking into account the withdrawal states that may confound the clinical presentation. The current study also followed this line of assessment interviewing the patients after 15 days of detoxification. The use of benzodiazepines during the detoxification phase subdued the intensity of withdrawal symptoms that may have otherwise confounded our assessment, thus allowing the interview to be conducted at an earlier date than the stipulated 4 weeks required by DSM-IV before confidently diagnosing another psychiatric disorder, not due to alcohol intoxication or withdrawal [52].

In the current study, no significant association was found between various socio-demographic variables and the presence of psychiatric comorbidity except for unemployment. When patients with and without psychiatric illness were compared, patients with psychiatric illnesses had higher rates of unemployment similar to the study by Cherkunath et al. [21]. The high rates of unemployment might be due to multiple reasons such as greater chances of impaired work performance or absenteeism, excessive time and money spent over alcohol use, and frequent hospitalizations seen with alcohol dependence with psychiatric comorbidity more than those without.

Severity of dependence and association with psychiatric comorbidity

Our study found a significant association of duration of drinking and severity of dependence with the presence of comorbidity. No association was found with other variables such as age of initiation, frequency, or duration of abstinence. These findings are similar to many earlier studies which reported an association between duration of drinking and severity of dependence with both Axis 1 and Axis 2 comorbidities [9, 56,57,58]. On the contrary, Malik et al. [48] reported no significant correlations between the presence of comorbidity and the duration of drinking or the severity of dependence. Similarly, Sudodh et al. [49] reported no significant correlation between the duration of substance use and the presence of comorbidity.


To conclude, this study provides an insight into the prevalence of psychiatric comorbidity in alcohol-dependent individuals and its increasing probability with increasing severity of dependence, thereby emphasizing the importance of a thorough evaluation for the probability of dual diagnosis and providing treatment as needed. The study was limited to an in-patient population in a hospital setting; hence, results cannot be generalized to a community setting. Mini Plus scale could not differentiate between independent and alcohol-induced psychiatric disorders. Psychiatric disorder could not be placed in a time frame (lifetime, past, current diagnosis). The study was not designed to take into account Axis 2 disorders which have been done in many previous studies. Future studies on comorbidity in alcohol dependence will focus on a larger sample size including both in- and outpatients and longitudinal assessments of subjects for psychopathology, noting how the prevalence of psychiatric disorders change over time and affect treatment response, dropout rate, outcome, and whether or not the coexisting psychopathology influences the treatment-seeking behavior of alcoholics.