Meget sjældent (mindre end 1 ud af 10. 000 patienter) har tilfælde af unormal blodpropdannelse (blodklumper i blodårene) forekommet ved anvendelse af lignende medicin; dette kan muligvis også forekomme ved behandling med GONAL- f / hCG, eller GONAL- f / lutropin alfa / hCG behandling.
Very rarely (less than 1 in 10000 patients) abnormal blood clottings (blood clots in blood vessels) have been seen to occur with similar medicines, so this could possibly occur with GONAL-f / hCG therapy or GONAL-f / lutropin alfa/ hCG therapy.