Der er meget sjældne rapporter om erythema multiforme, Stevens- Johnsons syndrom eller toksisk epidermal nekrolyse, hvor overfølsomhed over for abacavir ikke kunne udelukkes.
Very rarely cases of erythema multiforme, Stevens- Johnson syndrome or toxic epidermal necrolysis have been reported where abacavir hypersensitivity could not be ruled out.