Lactose Efient bør ikke anvendes til patienter med arvelig galactoseintolerans, en særlig form af hereditær lactasemangel (Lapp Lactase deficiency) eller glucose/ galactose malabsorption.
Lactose Patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose- galactose malabsorption should not take Efient.