You should not take Ceretor if you are allergic to Ceretor or any of the ingredients in the medicine. Also, avoid taking Ceretor if your kidney functions are severely deranged or if you ever had localized bleeding in the brain (cerebral hemorrhage). You should also avoid taking this medicine if you are suffering from Huntington’s disease/chorea (a genetic disorder where the brain cells die quickly causing deterioration of mental and physical abilities over time).