De hyppigste bivirkninger af Optaflu (som ses hos flere end 1 ud af 10 patienter) er hovedpine, rød - men, smerte, utilpashed og træthed.
The most common side effects with Optaflu (seen in more than 1 patient in 10) are headache, erythema (reddening of the skin), pain, malaise (feeling unwell) and fatigue (tiredness).