A controlled crossover study of the selective serotonin reuptake inhibitor citalopram in irritable bowel syndrome.
BACKGROUND
Selective serotonin reuptake inhibitors (SSRIs) are frequently used in the treatment of irritable bowel syndrome (IBS) although evidence of their efficacy is scarce.


OBJECTIVE
Twenty three non-depressed IBS patients were recruited from a tertiary care centre and included in a crossover trial comparing six weeks of treatment with the SSRI citalopram (20 mg for three weeks, 40 mg for three weeks) with placebo. IBS symptom severity was the primary outcome measure, and depression and anxiety scores were also measured. The effect of acute administration of citalopram on colonic sensitivity and on colonic response to feeding was investigated as a putative predictor of symptomatic response to the drug.


RESULTS
After three and six weeks of treatment, citalopram significantly improved abdominal pain, bloating, impact of symptoms on daily life, and overall well being compared with placebo. There was only a modest effect on stool pattern. Changes in depression or anxiety scores were not related to symptom improvement. The effect of acute administration of citalopram during a colonic barostat study did not predict clinical outcome. Analysis of the first treatment period as a double blind parallel arm study confirmed the benefit of citalopram over placebo.


CONCLUSIONS
The SSRI citalopram significantly improves IBS symptoms, including abdominal pain, compared with placebo. The therapeutic effect is independent of effects on anxiety, depression, and colonic sensorimotor function.
Tack
J
J
Department of Internal Medicine, Division of Gastroenterology, University Hospital Gasthuisberg, Leuven, Belgium. jan.tack@med.kuleuven.ac.be
Broekaert
D
D
Fischler
B
B
Van Oudenhove
L
L
Gevers
A M
AM
Janssens
J
J
D015746:Abdominal Pain / Q000188:drug therapy; D000328:Adult; D000368:Aged; D018687:Antidepressive Agents, Second-Generation / Q000627:therapeutic use; D001007:Anxiety / Q000150:complications / Q000188:drug therapy; D015283:Citalopram / Q000627:therapeutic use*; D018592:Cross-Over Studies; D003672:Defecation / Q000187:drug effects; D003863:Depression / Q000150:complications / Q000188:drug therapy; D004106:Dilatation; D006801:Humans; D043183:Irritable Bowel Syndrome / Q000150:complications / Q000188:drug therapy* / Q000523:psychology; D008875:Middle Aged; D019518:Postprandial Period; D011312:Pressure; D011569:Psychiatric Status Rating Scales; D017367:Selective Serotonin Reuptake Inhibitors / Q000627:therapeutic use*; D012720:Severity of Illness Index; D020886:Somatosensory Disorders / Q000188:drug therapy / Q000209:etiology; D016896:Treatment Outcome
D018687:Antidepressive Agents, Second-Generation; D015283:Citalopram; D017367:Selective Serotonin Reuptake Inhibitors