distension, gastritis, dysphagia, dyspepsia, gastroesophageal reflux disease, ascites, hematemesis, taste perversion, abdominal pain, dehydration, anorexia, cachexia, vomiting
[web.archive.org]
heavy sedation, a marked decrease in PaO2 (5.8 kPa) and increased PaCO2 (7.5 kPa).
[ncbi.nlm.nih.gov]
Postmarketing reports : Circulatory depression [ Ref ] Gastrointestinal Very common (10% or more): Nausea (18%), vomiting (10%), constipation Common (1% to 10%): Dry mouth, abdominal
[drugs.com]