Sjældent kan bivirkninger som kramper, hovedpine, omtågethed, synsforstyrrelser eller en abnorm, rørformet forbindelse mellem luftrøret og spiserøret forekomme.
Rarely, such side effects as seizures (fits), headache, confusion, changes in vision, or an abnormal tube-like connection between the windpipe and the passage to the stomach (gullet), may occur.