Virbac Effipro Duo® Against Fleas and Tick For Dogs 2-10kg 67/20 mg, 4 PipettesVirbac Effipro Duo Effipro Duo 67mg 20 mg solution for dropping on the skin in medium sized dogs and for use against fleas or flea and tick infestation. Effipro Duo 67mg 20 mg solution for dropping on the skin in medium sized dogs and for use against fleas or flea and tick infestations. Against fleas: for the treatment and control of flea (Ctenocephalides felis) infestations. One treatment prevents further infestations for 7 weeks. For control of flea