Trigger point injection treatment with the 5-HT3 receptor antagonist tropisetron in patients with late whiplash-associated disorder. First results of a multiple case study.

Preliminary results of an ongoing study on the effectiveness of trigger point injections with tropisetron in 20 patients with late whiplash-associated disorder are presented. The study demonstrated more than 50% pain relief for more than 2 weeks in 52% of the 73 treatment sessions. The duration of effectiveness of the injections showed great intraindividual and interindividual variation.