Fluoxetine (Prozac)

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In Kuiken, S. et AL (2003) study, they had theorized that fluoxetine (Prozac), a selective serotonin reuptake inhibitor, has visceral analgesic properties, leading to increased sensory thresholds during rectal distention and improvement of symptoms, in particular in IBS patients with visceral hypersensitivity. They had imagined that this effect would be more prominent in patients with decreased sensory thresholds, or visceral hypersensitivity, in comparison with patients with normal rectal sensitivity. (Kuiken, S. D., Tytgat, G. (2003).
Kuiken, S. et AL (2003) studied the effect of 6 weeks of treatment with fluoxetine or placebo on rectal sensitivity in 40 consecutive, nondepressed IBS patients. A minimum work-up to exclude organic disease …show more content…

et AL (2003), study the primary end points were the thresholds for discomfort/ pain during rectal distention. Secondary end points were abdominal pain scores and individual gastrointestinal symptoms, global symptom relief, and psychological symptoms. Since hypersensitivity is best elicited by rapid, phasic distention protocols, they had used the threshold for discomfort/pain obtained during phasic distention to determine hypersensitivity to rectal distention. (Kuiken, S. D., Tytgat, G. (2003). Hypersensitivity was defined as a threshold for discomfort/pain during phasic distention of less than the 10th percentile of HV. (Kuiken, S. D., Tytgat, G. …show more content…

However, fluoxetine did not significantly alter the mean threshold for discomfort/pain compared with placebo, either in hypersensitive or in normosensitive patients. In addition, individual discomfort thresholds remained unaltered during both treatments, both in normosensitive and hypersensitive patients. (Kuiken, S. D., Tytgat, G. (2003).
In addition, no effect on IBS symptoms could be demonstrated in the entire group of treated patients. However, in patients with hypersensitivity to rectal distention, fluoxetine reduced the number of patients reporting significant abdominal pain, which was not observed in patients with normal rectal sensitivity. Future, larger clinical trials are certainly required to confirm this. (Kuiken, S. D., Tytgat, G. (2003). Therefore in their study, Kuiken et al (2003) believed that fluoxetine does not change rectal sensitivity and symptoms in IBS patients and the beneficial effects of fluoxetine for IBS seem limited. (Kuiken, S. D., Tytgat, G.

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