Adjunctive nonopioid medications for chronic abdominal pain
While there are few randomized controlled trials establishing efficacy of pharmacotherapy for sustained improvement of abdominal pain or related suffering, several small trials and consensus clinical expert opinion suggest partial improvement in these domains.26,27 Central neuromodulators that can attenuate chronic visceral pain include antidepressants, antipsychotics, and other central nervous system–targeted medications.26 Tricyclic antidepressants (e.g., amitriptyline, nortriptyline, imipramine, desipramine) are often first-line treatment for FGIDs.28 Serotonin noradrenergic reuptake inhibitors (e.g., duloxetine, venlafaxine, desvenlafaxine, milnacipran) are also effective in pain management. Selective serotonin reuptake inhibitors (e.g., paroxetine, fluoxetine, sertraline, citalopram, escitalopram) can be used, especially when comorbid depression, anxiety, and phobic disorders are present. Tetracyclic antidepressants (e.g., mirtazapine, mianserin, trazodone) are effective treatments for early satiety, nausea/vomiting, insomnia, and low weight. Augmenting agents are utilized when single agents do not provide maximum benefit, including quetiapine (disturbed sleep), bupropion (fatigue), aripiprazole, buspirone, and tandospirone (dyspeptic features and anxiety). Delta ligands including gabapentin and pregabalin are helpful for abdominal wall pain or fibromyalgia. Ketamine is a newer but promising pathway for treatment of pain and depression and is increasingly being utilized in outpatient settings. Additionally, partial opioid-receptor agonists including methadone and suboxone have been reported to decrease pain in addition to their efficacy in addiction recovery. Medical marijuana is another area of growing interest, and while research has yet to show a clear effect in pain management, it does appear helpful in nausea and appetite stimulation. Obtaining a therapeutic response is the first treatment goal, after which a patient should be monitored in at least 6-month intervals to ensure sustained benefits and tolerability, and if these are not met, enhancement of treatment or a slow taper is indicated. As in all treatments, a positive patient-provider relationship predicts improved treatment adherence and outcomes.26 However, while these pharmacological interventions can reduce symptom severity, there is little evidence that they reduce traumatization without adjunctive psychotherapy.29
Summary
Both behavioral and pharmacological treatment options are available for chronic abdominal pain and most useful if traumatic manifestations are assessed and included as treatment targets. A multidisciplinary approach to the treatment of chronic abdominal pain with increased screening and treatment of trauma is a promising pathway to improved care and management for patients with chronic pain. If trauma is left untreated, the benefits of otherwise effective treatments are likely to be significantly limited.
