[When and how should the long-term anti-epileptic treatment be stopped]

Although for some decades it has been customary to stop long-term treatment of epilepsy in patients who have been free of crises for several years, there is still no general agreement as to when, how and in which cases such treatment should be stopped. Several factors have to be taken into account when making such a decision: the known toxicity of anti-epileptic drugs; the fact that 10-20% of the patients on such treatment have recurrences of their epileptic crises and that around 25% of the children and 40% of the adults relapse when long-term treatment is stopped. On the other hand, factors which reduce the risk of relapse have recently been identified. When the psychological benefit of no longer having to take anti-epileptic drugs together with their high cost are also considered, it would seem advisable to stop treatment when the patient has had no epileptic crises for several years. Since there is no significant difference in the frequency of relapses when anti-epileptic drugs are suspended 2-5 years after the last crises, and these crises are more frequent when paroxystic activity is seen on the EEG before stopping the drugs, we recommend that treatment be stopped after 2 years free of crises in idiopathic epilepsy, after 3 years with no sign of abnormality in the EEG in patients with partial cryptogenic epilepsy and after at least 4 years without crises and 2 years of normal EEG in patients with partial symptomatic or generalized cryptogenic or symptomatic epilepsy. The criteria for suspending drug treatment should take account of the pharmacokinetic features and permit EEG control. Therefore we recommend that 40% of the total dose be stopped during the first 6 months at a rate of 20% every three months and then a further 20% every two months until medication has been stopped completely.