BMJ 1995;311:1047-1052 (21 October)
Papers
Anticonvulsant drugs for management of pain: a systematic review
Henry McQuay,
clinical reader in pain relief,a
Dawn Carroll,
senior research nurse,a
Alejandro R Jadad,
research fellow,a
Philip Wiffen,
principal pharmacist,b
Andrew Moore,
consultant biochemist aa Oxford Pain Relief Unit, Churchill Hospital, Oxford OX3 7LJ,
b Pharmacy Department, Churchill Hospital
Correspondence to: Dr McQuay.
Abstract
Objective: To determine effectiveness and adverse effects of anticonvulsant drugs in management of pain.
Design: Systematic review of randomised controlled trials of anticonvulsants for acute, chronic, or cancer pain identified by using Medline, by hand searching, by searching reference lists, and by contacting investigators.
Subjects: Between 1966 and February 1994, 37 reports were found; 20 reports, of four anticonvulsants, were eligible.
Main outcome measures: Numbers needed to treat were calculated for effectiveness, adverse effects, and drug related withdrawal from study.
Results: The only placebo controlled study in acute pain found no analgesic effect of sodium valproate. For treating trigeminal neuralgia, carbamazepine had a combined number needed to treat of 2.6 for effectiveness, 3.4 for adverse effects, and 24 for severe effects (withdrawal from study). For treating diabetic neuropathy, anticonvulsants had a combined number needed to treat of 2.5 for effectiveness, 3.1 for adverse effects, and 20 for severe effects. For migraine prophylaxis, anticonvulsants had a combined number needed to treat of 1.6 for effectiveness, 2.4 for adverse effects, and 39 for severe effects. Phenytoin had no effect on the irritable bowel syndrome, and carbamazepine had little effect on pain after stroke. Clonazepam was effective in one study for temporomandibular joint dysfunction. No study compared one anticonvulsant with another.
Conclusions: Anticonvulsants were effective for trigeminal neuralgia and diabetic neuropathy and for migraine prophylaxis. Minor adverse effects occurred as often as benefit.
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Key messages
- Key messages
- To evaluate the effectiveness of these drugs, we conducted a systematic review of all randomised controlled trials reported between 1966 and February 1994
- Only 20 trials were eligible for inclusion, and three pain syndromes were subject to more than one trial: trigeminal neuralgia, diabetic neuropathy, and migraine prophylaxis.
- Overall number needed to treat to produce benefit (improved pain scores) was about 2.5, for minor adverse effects it was about 3, and for severe adverse effects it was 20-30
- Anticonvulsants do have an analgesic effect, although at similar risk of minor adverse effects
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