In clinical studies, adverse effects of mild to moderate nature occurred in 7% of the patients treated with trimebutine maleate. No single side effect occurred in more than 1.8% of the patients and some of these might have been related to the patient's condition rather than the medication. The commonly reported adverse effects are as follows: Gastrointestinal: Dry mouth, foul taste, diarrhea, dyspepsia, epigastric pain, nausea and constipation were reported in a total of 3.1% of the patient population.
Central Nervous System: Drowsiness, fatigue, dizziness, hot/cold sensations and headaches were reported in 3.3%.
Allergic: rash in 0.4% of the patients.
Miscellaneous: Menstrual problems, painful enlargement of breast, anxiety, urine retention and slight deafness were also infrequently reported.