Abstract:
:Lamotrigine, a sodium channel blocker that selectively inhibits the neuronal release of glutamate, has been shown to produce analgesia in acute and chronic pain models in rats without causing noticeable sedation. After oral administration it also reduces pain scores, as assessed by the cold pain test, in volunteers. The purpose of this study was to determine the analgesic effect of lamotrigine given by mouth to healthy volunteers as evidenced by alterations in chemo-somatosensory evoked potentials. The following factors were measured: latency to N1 and P100 peak (ms); amplitude between the N1 and P100 peak (microV); visual analogue pain intensity scores. A double-blind, randomised and crossover design was used in which 12 volunteers received either placebo or lamotrigine 300 mg on separate occasions as determined by the randomisation schedule. Volunteers were tested before and 2 h after the treatment. The plasma lamotrigine concentration was measured immediately after the end of the experimental sessions. Lamotrigine produced a significantly higher latency to P100 values at 2 h postdrug than placebo (p < 0.05) but had no significant effects on the other factors. Although plasma concentrations were similar to those observed in the cold pain test, we conclude that lamotrigine 300 mg by mouth had no analgesic effect in this acute pain model.
journal_name
Anaesthesiajournal_title
Anaesthesiaauthors
Klamt JG,Posner Jdoi
10.1046/j.1365-2044.1999.00959.xsubject
Has Abstractpub_date
1999-08-01 00:00:00pages
774-7issue
8eissn
0003-2409issn
1365-2044pii
ana959journal_volume
54pub_type
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