Relamorelin and other ghrelin receptor agonists - future options for gastroparesis, functional dyspepsia and proton pump inhibitors-resistant non-erosive reflux disease.

There is an unmet need for effective pharmacological therapies for the treatment of gastroparesis and other upper gastrointestinal (GI) motility disorders, which reduce patients' quality of life and are a burden to the healthcare system. Ghrelin is an endogenous growth hormone secretagogue receptor ligand and has been shown to exert prokinetic effects on GI motility. Nevertheless, considering the short half-life of ghrelin its use in clinical practice is limited. Thus, ghrelin receptor agonists with enhanced pharmacokinetics were developed; they accelerate gastric emptying and improve symptoms of gastroparesis in animal models and humans. This review summarizes the current knowledge on relamorelin, a potent ghrelin mimetic, and other analogs which are in preclinical or clinical development stages for the management of upper GI disorders.