I de kliniske undersøgelser var de hyppigste bivirkninger (der optrådte hos mere end 1 ud af 10 patienter) lymfopeni (lavt antal lymfocytter, en form for hvide blodlegemer), hypophosphatæmi (lav mængde fosfat i blodet), hæmorrhagi (blødning), hypertension (forhøjet blodtryk), diarré, kvalme og opkastninger, udslæt, hårtab, "hånd- fod- syndromet" (udslæt på og smerte i håndfladerne og fodsålerne), rødme, kløe, træthed, smerter og forhøjet amylase og lipase (enzymer, der produceres i pancreas).
In clinical studies, the most common side effects with Nexavar (seen in more than 1 patient in 10) were lymphopenia (low levels of lymphocytes, a type of white blood cell), hypophosphataemia (low levels of phosphate in the blood), haemorrhage (bleeding), hypertension (high blood pressure), diarrhoea, nausea (feeling sick), vomiting, rash, alopecia (hair loss), ‘ hand foot syndrome’ (rash and pain on the palms and soles), erythema (redness), pruritus (itchiness), fatigue (tiredness), pain, and increased amylase and lipase (enzymes produced by the pancreas).