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Cisapride used, Side effects, Dose, & more

 Cisapride

Brand name:- Pulsid , Cisar, Motilax, Prokin, Pryde.

Cisapride is a gastroprokinetic agent, a drug that increases motility in the upper gastrointestinal tract. It acts directly as a serotonin 5-HT₄ receptor agonist and indirectly as a parasympathomimetic. Stimulation of the serotonin receptors increases acetylcholine release in the enteric nervous system.
In many countries, it has been either withdrawn or had its indications limited because of reports of the side-effect long QT syndrome, which may cause arrhythmias. The U.S. Food and Drug Administration (FDA) issued a warning letter to doctors, and cisapride was voluntarily removed from the U.S. market on July 14, 2000.

Pharmacodynamic:-

Cisapride is a parasympathomimetic which acts as a serotonin 5- HT4 agonist; upon activation of the receptor signaling pathway, cisapride promotes the release of acetylcholine neurotransmitters in the enteric nervous system. Cisapride stimulates motility of the upper gastrointestinal tract without stimulating gastric, biliary, or pancreatic secretions. Cisapride increases the tone and amplitude of gastric (especially antral) contractions, relaxes the pyloric sphincter and the duodenal bulb, and increases peristalsis of the duodenum and jejunum resulting in accelerated gastric emptying and intestinal transit. It increases the resting tone of the lower esophageal sphincter. It has little, if any, effect on the motility of the colon or gallbladder. Cisapride does not induce muscarinic or nicotinic receptor stimulation, nor does it inhibit acetylcholinesterase activity.

 Mechanism of action:-

Cisapride acts through the stimulation of the serotonin 5 - HT4 receptors which increases acetylcholine release in the enteric nervous system (specifically the myenteric plexus). This results in increased tone and amplitude of gastric (especially antral) contractions, relaxation of the pyloric sphincter and the duodenal bulb, and increased peristalsis of the duodenum and jejunum resulting in accelerated gastric emptying and intestinal transit.

 Used:- 

Used in the treatment of gastroesophageal reflux disease (acid reflux) and constipation.

Side effects:- 

Common side effects are Headache, Nausea, Diarrhea.

Dose:-  AS DIRECTED BY YOUR DOCTOR.

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