Behandling med Fertavid kan (ligesom graviditet) øge risikoen for dannelse af en blodprop i et blodkar, oftest i blodårerne i benene eller i lungerne.
Treatment with Fertavid (like pregnancy itself) may increase the risk of thrombosis (the formation of a blood clot in a blood vessel, most often in the veins of the legs or the lungs).