Irritable bowel syndrome (IBS) is very common functional gastrointestinal disorder in daily gastrointestinal practice. Its etiology is multifactorial and incompletely understood. Different types of treatment have been trying but no single drug is effective for every patients. After the discovery of 5HT4(5 hydroxytryptamine-4) receptor and its effect on gastrointestinal motility, 5HT4 receptor agonist becoming a good therapeutic tool in different functional gastrointestinal disorder. Prucalopride is a selective 5HT4 agonist and it has proven benefit in chronic idiopathic constipation but there is not enough evidence that it is effective in constipation predominant IBS.

Objective: To assess the efficacy of Prucalopride in constipation predominant IBS patients.

Material & method: Consecutive patients of both sexes, age more than 18 years attended the outpatient department of Gastroenterology meeting the inclusion Criteria of IBS-C will be initially enrolled for the study. Their clinical history, examination & initial investigations report will be noted on the standard data sheet. Any alternative diagnosis if proven by clinical examination or laboratory investigation will be excluded from the study. Randomization into two groups (Prucalopride and placebo) will be performed by lottery. Patients will be randomly assigned to receive either Prucalopride 2 mg or placebo for 6 weeks. IBS symptoms will be assessed by IBS-SSS (symptom severity score) and IBS-QOL(quality of life) at the baseline, 2nd week and 6th week of treatment (end of treatment). Any adverse effect due to drugs will also be monitored by base line ECG, calculation of corrected QT interval and ECG monitoring (2 weeks and 6 weeks) during the course of treatment.

Data analysis By SPSS. IBS-SSS and IBS-QOL instrument scores will be expressed as mean ± standard deviation. Statistical analysis will be done by paired and unpaired 't' test. P value <0.05 will be considered statistically significant.

Ethical Consideration:

Every ethical issue will be discussed with the patient regarding the study and informed written consent will be obtained. There will be no chance of disclosure of information that will have been harmful to the patients or others. Permission have been taken from the concerned departmental ethical committee as well as ethical review committee of BSMMU in order to carry out the study.

Consecutive patients of both sexes, age more than 18 years attended the outpatient department of Gastroenterology meeting the inclusion Criteria of IBS-C will be initially enrolled for the study. Their clinical history, examination & initial investigations with Complete Blood Count , C-Reactive Protein, Tissue Transglutaminase antibody, Oral Glucose Tolerance Test, Thyroid Stimulating Hormone will be done from respected department of BSMMU. Report will be noted in the standard data sheet. Any alternative diagnosis if proven by clinical examination or laboratory investigation will be excluded from the study. All participants will be advised to maintain their usual dietary practices throughout the study. The subject will be recruited according to sample size. Total study population will be divided in to Prucalopride and placebo group. An independent treatment code will be generated and allocated according to sample size in each group. Randomization into two groups will be performed by lottery. The independent treatment codes and allocation will be maintained, which will be locked until all analyses will have been completed. Thus, the clinical trial will be performed double-blind with all patients and investigators will unaware of which treatment is allocated.

One group will receive tab Prucalopride 2 mg once daily 30 minute before breakfast, while the other group will receive identical looking placebo one tab once daily at same time. The tablets will be administered for a total of 6 weeks. Before starting treatment each individual will undergo a baseline assessment during which demographic data, base line investigations, IBS symptoms by IBS-SSS and QOL data will be recorded. Patients will be followed-up at 2 weeks, then at 6 weeks by IBS-SSS questionnaire and IBS-QOL questionnaire. Patients will be asked to return with the strips of the ingested drugs at the end of the treatment to count & ensure compliance. Any adverse effect due to drugs will also be monitored by base line ECG, calculation of corrected QT interval and ECG monitoring (2 weeks and 6 weeks) during the course of treatment. Any adverse event will be responded quickly and documented at the same time.

IBS-SSS is a 5 item tools. It is primarily a measure of IBS symptoms including abdominal pain and distension as well as bowel satisfaction. This scale evaluates IBS symptoms: abdominal pain, abdominal distension, stool frequency and consistency and interference with life in general. The IBS-SSS calculates the sum of these 5 items scored on a visual analogue scale from 0-100. Determination of severity of each symptom is determined by the patient. The nature of the items on IBS-SSS is appropriate to be used in clinical trials. The items are summed and thus the total score can range from 0 to 500 points. IBS severity has the following defined ranges: mild 75-174, moderate 175-300, and severe > 300.

The IBS-QOL questionnaire is a 34-item instruments which assess QOL impairment due to IBS symptoms. Each item is scored on a five-point scale (1 = not at all, 5 = extremely) that represents one of eight dimensions (dysphoria, interference with activity, body image, health-related worries, food avoidance, social reactions, sexual dysfunction, and relationships). After scoring by the patient, responses will be transformed to reverse code system (5= not at all, 1= extremely). Items are scored to derive an overall total score of IBS related QOL. To facilitate score interpretation, the summed total score is transformed to a 0-100 scale ranging from zero (poor QOL) to 100 (maximum QOL). The QOL instrument will be given to each patient before treatment is started. The patient will complete the form according to schedule and all data will be recorded and entered onto a data sheet.

Inclusion Criteria:

• Age:18-65 years.
• Patients who will Meet Rome IV criteria for IBS-Constipation (IBS-C).
• Patients classified as IBS-C had > 25% hard or lumpy stool (Bristol stool scale 1-2) and < 25% loose or watery (Bristol stool scale 6-7).
• Absence of alarm features (rectal bleeding, anemia, unexplained weight loss, and a family history of organic GI diseases (e.g. colon cancer or inflammatory bowel disease).
• Patients more than 55 years when full colonoscopy will normal.
• Patients given informed written consent.

Exclusion Criteria:

• Current treatment with laxative and Selective Serotonin Re-uptake Inhibitor.
• Unable or Unwilling to stop medication including lactulose, lubiprostone etc.
• Known organic bowel diseases (e.g. inflammatory bowel disease, tuberculosis, diverticular disease, etc.).
• Secondary causes of constipation e.g. Diabetes Mellitus, Hypothyroidism, Cerebrovascular disease and Parkinsonism. Known severe depression and psychiatric disorder.
• Clinical feature suggestive of organic disease (H/O weight loss, per rectal bleeding, family history of malignancy etc).
• Previous GI surgery.
• Pregnancy or lactation.

Participant, care provider and primary outcome assessor will unaware about the allocated treatment.