Patienter med hjertesygdomme, såsom angina, kongestivt hjertesvigt eller arytmier, bør nøje observeres for forværring af deres kliniske tilstand under behandling med AVONEX.
3 Patients with cardiac disease, such as angina, congestive heart failure or arrhythmia, should be closely monitored for worsening of their clinical condition during treatment with AVONEX.