Inhibitory effect of PEA (1–10 mg·kg−1, oral) on upper gastrointestinal transit in mice treated with OM. Transit was measured 28 days after OM administration. Results (the means ± SEM of 12–15 mice for each experimental group) are expressed as a percentage of upper gastrointestinal transit. #P < 0.05, significantly different from vehicle; *P < 0.05, significantly different from OM.