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Management of constipation in patients with schizophrenia—a case study and review of literature

Abstract

Background

Schizophrenia is a disorder that affects about 1% of the US population, with an extensive impact on patients’ health and their risk of later developing comorbidities from treatment. While literature on the side effect profile of antipsychotics is abundant, there are few studies on identification of anticholinergic effects on gut motility and prophylaxis development. The aim of this review is to consider antipsychotic-associated constipation in patients with schizophrenia and to discuss management of antipsychotic-induced constipation as documented in the literature.

Main body

We present a case of antipsychotic-induced constipation and conducted a literature review assessing the prevalence of this issue in this population. The search was done on Embase, MEDLINE, Cochrane Library, and PubMed databases. Key word searches included constipation with concurrent antipsychotic use, antipsychotics and anticholinergic effects, factors causing constipation in schizophrenia, social disparities involved with constipation, and colorectal cancer screenings.

Main findings included high complication rates that may be explained by clozapine-specific side effects, negative health habits, disease, and treatment-related metabolic disorders. Co-existing negative symptoms could also be associated with health outcomes and was found to have adverse consequences on schizophrenia progression. Comorbidities of diabetes and cardiovascular complications contributed to gut hypomotility. Caregiver burden was a factor in delayed recognition of constipation as a side effect. Routine surveillance for symptoms and optimization of medications facilitates early recognition of constipation.

Conclusion

Overall, there is insufficient trial-based evidence to compare the effectiveness and safety of common pharmacological interventions for constipation, such as lactulose, polyethylene glycol, stool softeners, and lubricant laxatives.

Background

Constipation is a common complaint and side-effect for people taking antipsychotics, notably clozapine, thioridazine, chlorpromazine, and olanzapine [1, 2]. Untreated constipation can be severe and lead to complications such as overflow constipation, fecal impaction, paralytic ileus, and death. Among psychiatric patients taking antipsychotics, constipation is a symptom that can be overlooked due to the challenges in self-care and health awareness, as well as the patients’ higher discomfort or pain threshold [3]. There is insufficient trial-based evidence and literature review on antipsychotic associated constipation in patients with schizophrenia and comorbidities, like hypertension and diabetes, that increase the likelihood of this condition [4]. Appropriate management requires evaluating medical history and medication interactions before recommending a bowel regimen to this population. For patients taking calcium channel blockers in addition to antipsychotics, there may be a synergistic effect on slowing of bowel motility that necessitates prophylactic bowel regimen to reduce medication noncompliance and hospitalizations [5, 6].

Dysregulation of dopaminergic neuronal function is the central pathophysiology to psychosis. Dopamine hyperactivity in the mesolimbic and hypoactivity in the mesocortical pathway are hypothesized to be the manifestation of positive and negative symptoms seen in schizophrenia and can be managed with first (FGAs) or second (SGAs) generation antipsychotics [1,2,3]. High-potency FGAs exhibit greater extrapyramidal side effects due to greater antagonism to the D2 receptor while low-potency FGAs exhibit greater anticholinergic effects and antihistaminergic. SGAs are comparable to FGAs in clinical efficacy without increasing the risk for extrapyramidal side effects, due to their role in 5HT2A receptor modulation [6, 7]. It is recognized, however, that SGAs differ in affinity, dissociation rates, and specificity of brain areas for D2 receptor affinity when compared to FGAs, leading to significantly less D2 blockage side effects and complications over time [6, 7].

Central side effects can be difficult to recognize in psychiatric patients as symptoms often overlap with clinical disorders (i.e., confusion and delirium). Regardless of the duration, central anticholinergic side effects can further impair memory, concentration, and confusion in comorbid psychiatric conditions especially among people with schizophrenia [8]. Furthermore, the concurrent use of antipsychotics and other drugs with anticholinergic profiles (i.e., antihistamines, antidepressants, calcium channel blockers, antispasmodics) may further exacerbate anticholinergic side effects leading to greater impairment of cognitive functioning. Anticholinergic side effects are prone to being underreported by psychiatric patients due to communication difficulties, sedation and analgesic properties of medical regimens, or limited awareness of acute/chronic symptom presentation [9]. Gastrointestinal hypomotility is a well-documented effect of anticholinergic drugs and if unrecognized, gastrointestinal hypomotility may progress into a medical complication as in the case of constipation or impact ileus [1,2,3,4]. While some FGAs exhibit anticholinergic properties, i.e., haloperidol, thioridazine, and chlorpromazine; SGAs show greater affinities for cholinergic receptors in vitro [10]. Among the atypical antipsychotics, clozapine, quetiapine, and olanzapine demonstrate significant muscarinic receptor affinity in vitro that correlates in a dose dependent manner [9,10,11]. Systematic reviews demonstrate patients taking clozapine have significantly higher rates of antipsychotic induced constipation vs patients on other antipsychotics, showing as many as 60% of patients developing constipation [4].

Main text

Case study

A 46-year-old male with schizoaffective disorder, hypertension, and type II diabetes mellitus presented to the emergency center with acute psychosis and aggressive behavior after stopping his medications (haloperidol, valproate, diphenhydramine) for 2 months. In the interview, the patient did not exhibit psychosis symptoms or aggression; his chief complaint was the stomach pain, nausea, diarrhea, and constipation that may have been precipitated by eating bad food. He reports medication noncompliance due to side effects of nausea and dry mouth. Lab-work on admission showed CBC, CMP, and TSH/T4 within the normal limits; urine drug screen toxicology and urinalysis were negative. On a physical exam, the patient’s abdomen was distended and rigid. A kidney-ureter-bladder and abdominal X-ray revealed increased stool burden as the probable source of the patient’s abdominal pain. The patient was subsequently treated with magnesium hydroxide and polyethylene glycol. We restarted the appropriate treatment for the patient’s schizophrenia and hypertension, with improvement of the patient’s condition. A prophylactic bowel regimen of docusate sodium was recommended upon discharge, in addition to his other medications (haloperidol, valproate, diphenhydramine, and amlodipine). During the history taking, the patient denied any concerning symptoms for constipation despite abdominal distention. Given the risk factors and physical findings, it was useful to follow an algorithm such as Fig. 1, to obtain proper imaging and begin a trial of laxatives.

Fig. 1
figure 1

Considerable factors in constipation workup

This case highlights the need to maintain a high index of suspicion for anticholinergic side-effects secondary to medication interaction, especially in a patient group that exhibits diet and lack of exercise related risk factors to slowed motility. Rapid diagnosis and early treatment are crucial for the health outcomes for people with schizophrenia and other comorbidities. The outcome of this case showed good resolution of constipation when treated with laxatives. Since the patient did not have a history of non-compliance due to constipation, we advised him to keep track of his diet and symptoms as well as encouraged the use of laxatives if similar episodes occur.

Challenges in recognizing constipation as a treatment-limiting side-effect

Successful schizophrenia treatment depends on a combination of factors as current medications help with paranoia, delusions, and hallucinations, but may not address social withdrawal and other negative symptoms. Tools to manage a challenging disorder such as schizophrenia, such as building a strong support system and implementing health strategies with diet modification, stress relief, and exercise regime can have a profound effect on the frequency and severity of symptoms and reduce the likelihood of developing comorbidities that add to the disease burden [7, 12, 13].

Patients with this disorder have been observed to have poor nutritional statuses which can contribute to constipation issues, such as limited intake of healthy lipids, fiber, proteins, and vitamins [13, 14]. Compared to healthy cohorts’ levels, schizophrenic patients are at risk of lower folate and Vit B12 levels, with only 10.7% of 428 schizophrenic patients reporting healthy dietary patterns [14]. Another study in nutritional neuroscience found that more than half the studied schizophrenic patients had food addiction, which in term increased the risk of obesity and cardiovascular risk [15]. Kim et al, found significantly lower dietary intakes of protein, polyunsaturated fatty acids (PUFAs), vitamin K, niacin, folate, and vitamin C in male schizophrenic patients compared to the male control subjects [16]. Additionally, protein deficiency has been linked to reduced cognitive functioning, independent of demographic or environmental factors [17].

While the impact of various antipsychotics on metabolic syndrome and their possible mechanisms are comprehensively reviewed, most are case reports that specifically discuss clozapine-induced gut hypomotility and life-threatening ileus [18,19,20,21,22]. Patients using antipsychotics had a 1.9 higher risk of developing constipation compared to non-users. Stanniland and Taylor reported rates of 1.5 to 25% compared to placebo [23]. With clozapine use versus that of other medications, constipation is one of the top 4 reported side effects with rates ranging from 14 to 60% [18,19,20,21,22]. Other antipsychotics have varying anticholinergic effects, as seen in Table 1.

Table 1 Antipsychotic formulations and side-effect profiles

Palmer et al. reports that clozapine-induced gastric hypomotility is often silent, with self-reported constipation having low sensitivity in its diagnosis, even using the Rome criteria, and treating gastric hypomotility based on self-reported symptoms questions will miss most cases [21]. Virtanen et al. found that constipation and dyspepsia are gastrointestinal symptoms that are often ignored in research on physical comorbidities of schizophrenia, with the prevalence of constipation at 31.3% and of dyspepsia 23.6% [24]. Some risk factors for constipation were paracetamol and clozapine use, older age, and living in sheltered homes. Most reports are about the severe and often fatal gastric ileus induced by clozapine and include some discussion on bowel regimens for management, but our review shows that there is little consensus on early diagnosis criteria and recommendations on bowel regimen even though the anticholinergic side effect profile of antipsychotics is known.

Furthermore, people with schizophrenia can have a difficult time addressing constipation due to issues with self-care, often neglecting to practice healthy behaviors such as exercise and weight control, resulting in greater occurrence of metabolic and anticholinergic side-effects because of antipsychotic use [25, 26]. Disturbances in thoughts, behavioral changes, and impaired cognitive functions which affect a person’s ability to work or communicate socially and incapability of self-care characterize schizophrenia [27, 28]. These features make it difficult for the affected individual to carry out daily activities and maintain personal hygiene. Poor health status in those with schizophrenia has been attributed to factors like poverty, less resources, medications, and more so, the effect of systemic diseases like diabetes, hypertension, and osteoporosis which reduce the self-care ability of the patients [26,27,28]. In a study conducted by Tas et al., it was found that patients admitted to an in-patient facility for “failure to meet basic needs” need assistance in the early discharge period for parameters such as “coping, need of knowledge, treatment and care, self-care, sleep, role and relationships.” [27] ÇiftÇi et al. found that the average self-care ability among schizophrenia patients was lower than that of the individuals with anxiety disorder and depression [28]. The lack of some qualities that maintain self-care, such that lack of physical energy, awareness, decision-making, motivation, and confidence, can decrease the self-care ability of schizophrenic patients.

Additionally, mental health experts have recently discussed a challenge to proper gastrointestinal pathology screening: disparities in screening access in low socioeconomic status (SES) and African American individuals. A recent study by Anderson et al. shed light on decreased colon cancer screening in both African American and low SES individuals discussing how 63.9% of the cohort had never undergone colorectal cancer screening despite meeting criteria for screening recommendations based on age and family history of colorectal cancer [29]. Among these populations, diminished access to transportation or resources and inflexible work schedules can severely reduce patient turnout at appointments, as individuals report lower quality of healthcare and may be subject to implicit racial bias of their health care practitioners. It is possible such findings can be extrapolated for most gastrointestinal screenings in these high-risk groups. Attempts to increase screening access for these populations could prevent life threatening bowel complications.

Lastly, some studies have cited altered sensitivity to pain in schizophrenia may delay diagnosis and treatment of serious, life-threatening medical conditions [30,31,32]. Patients who are on antipsychotics may have an increased pain threshold, which makes it difficult for the patients to report somatic complaints later or less frequently [30,31,32]. Family caregivers also play an important role in taking care of these patients: in addition to managing unexpected behaviors of the patients such as aggression and violence, they often ensure completion of personal activities, chores (cooking, cleaning the house, etc.), other tasks (appointment arrangements, transportation, etc. ), and treatment compliance—all of which impose a heavy burden on them [33]. The results of several studies indicate that caregivers possess limited knowledge and awareness regarding the illness, the related coping strategies, and how to deal with and support the patient [33, 34]. The hours and commitment to caregiving activities that often lead to consequences for caregivers such as job loss, social activity decline imply that caregiver fatigue may contribute to late presentation of antipsychotic induced constipation. As in the case of our patient, the admission complaint was one that suggested an acute psychotic episode resulting from medication noncompliance, yet gathering collateral information from the caregiver revealed that there were issues in maintaining hygiene which the caregiver could not resolve on her own.

Current recommendations on monitoring and prophylaxis of antipsychotic-induced constipation

While there is strong evidence that clozapine and olanzapine cause gut hypomotility, constipation, and even ileus, there is little consensus about how to best treat this. In an observational study done by Every-Palmer et al., there was reduction in the colonic transit time of clozapine-treated patients when treated with docusate and senna and macrogol according to the Porirua Protocol [9]. Chukhin et al. found that with orlistat use compared to placebo, the proportion of patients endorsing constipation reduced [35]. In addition to treatment with laxatives, a reduction of antipsychotic dose has been proposed in the literature, though this may not be feasible for a patient that has had multiple episodes of psychosis without the added risk of a relapse [36, 37]. Bulot et al. conducted a quasi-experimental trial by prescribing polyethylene glycol as a first-line laxative to inpatients receiving antipsychotic agents and found a three-fold reduction of severe constipation cases [36]. The prevention of this potentially life-threatening condition can be economic and well-tolerated by patients (Table 2).

Table 2 Comparison of efficacious laxative regimens [38]

There is some research into whether traditional herbal medications may be used as a supplement or even an alternative to laxative use to prevent constipation in those suffering from schizophrenia-associated constipation. Traditional Chinese medicines (TCMS) consist of acupuncture, tai chi, tuina massage, and botanical supplements. Historically, TCMs are under-utilized as a possible treatment option and even considered a form of pseudoscience due to concerns of herbal products having been contaminated with heavy metals, pesticides, and other toxic compounds, as well as the lack of clinical evidence with comparative randomized clinical trials with the standard care. Rathbone et al. showed that Chinese herbal medicines may be beneficial for people with schizophrenia when combined with antipsychotics. Though the sample size of the study was small, the study also showed that TCMs showed greater improvement in the treatment of IBS-C than cisapride and mosapride [39]. A study by Fan et al. in 2004 compared glycerol suppository with the traditional Chinese medicine (TCM) approaches of tuina massage and acupuncture for relieving constipation. 240 psychiatric inpatients were recruited, and for 14 days underwent either daily rectal enemas, daily periods of tuina massage, half an hour of acupuncture, or a combination of all three treatments. Compared to tuina massage, glycerol laxative was less effective in relieving constipation at both two days after treatment [40]. However, there were no data comparing the common pharmacological interventions for constipation, such as lactulose, polyethylene glycol, stool softeners, lubricant laxatives, or of novel treatments such as linaclotide.

Similarly, electroacupuncture in some studies is believed to be effective in treating opioid-induced constipation and certain functional GI diseases like dyspepsia, chronic constipation (≥1 symptom including straining, hard stools, time-consuming defecation, sensations of incomplete evacuation, using manual assistance, for over 6 months). Yang et al. conducted a systematic review and meta-analysis of acupuncture treatment for opioid-induced constipation, which demonstrated that acupuncture has better results in clinical outcomes than non-acupuncture therapy [41]. Liu et al. conducted 28 sessions of electroacupuncture to increase the number of weekly complete spontaneous bowel movements (CSBMs) in 1075 patients with chronic severe functional constipation with no underlying pathologic cause for constipation. They found that eight weeks of EA increases CSBMs to 3 or more mean weekly CSBMs in the electro acupuncture group 37.7% compared with 14.1% in the placebo group [42]. Acupuncture-related adverse events during treatment were infrequent in both groups, and all were mild or transient and were considered safe for the treatment of chronic functional constipation, and thus has implications for use in patients who have schizophrenia and suffer from this condition.

Conclusion

Screening for constipation in schizophrenia may prove challenging due to poor communication abilities and disturbances in thought process. Current screening methods to assess constipation are subjective in nature and often labeled as a “patient report of constipation.” Even if patients articulate his/her bowel habits, there are discrepancies surrounding the word constipation gastrointestinal, causing hypo-motility to go unreported and this runs the risk of evolving into life-threatening complications. Objective tests to gauge the severity and the presence of gastrointestinal hypo-motility often require the expertise of a GI specialist or are not cost-effective.

Prescribing antipsychotics should be accompanied by regular physical monitoring, appropriate use of laxatives, and early referral of constipated patients, before the development of pathologic gastrointestinal processes. Randomized clinical trials are needed to compare pharmacological and other interventions for antipsychotic-related constipation. Such trials should focus on the treatment of constipation, with an emphasis on patient tolerability and rapid resolution.

Availability of data and materials

Not applicable.

Abbreviations

FGA:

First-generation antipsychotics

SGA:

Second-generation antipsychotics

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AS developed the manuscript idea and edited the manuscript in its entirety. AV wrote the “Background” and “Conclusion” sections of the manuscript. SA wrote the “Case study” and “Abstract” sections of the manuscript. VC developed all the tables associated with the manuscript and obtained consent for publication. KF ensured the references were adequate and proofread the final version of manuscript. JN helped develop the initial idea behind the manuscript and revised the manuscript. The authors have read and approved the final manuscript.

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Correspondence to Ashish Sarangi.

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Sarangi, A., Armin, S., Vargas, A. et al. Management of constipation in patients with schizophrenia—a case study and review of literature. Middle East Curr Psychiatry 28, 17 (2021). https://doi.org/10.1186/s43045-021-00097-6

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  • DOI: https://doi.org/10.1186/s43045-021-00097-6

Keywords

  • Schizophrenia
  • Antipsychotic-induced constipation
  • Constipation screening
  • Bowel regimen