Der er indberettet alvorlige bivirkninger, som nogen gange har dødelig udgang, herunder bronkospasme, hypoksi, synkope, lungeinfiltrater, akut respiratorisk distress syndrom (ARDS), respirationsstop, myokardieinfarkt, arytmier, akut hjerteinsufficiens og hjertestop.
Serious and sometimes fatal reactions, including bronchospasm, hypoxia, syncope, pulmonary infiltrates, acute respiratory distress syndrome (ARDS), respiratory arrest, myocardial infarction, arrhythmias, acute cardiac insufficiency and cardiac arrest have been observed.