Efficacy and safety of comfrey root extract ointment in the treatment of acute upper or lower back pain: results of a double-blind, randomised, placebo controlled, multicentre trial

@article{Giannetti2009EfficacyAS,
  title={Efficacy and safety of comfrey root extract ointment in the treatment of acute upper or lower back pain: results of a double-blind, randomised, placebo controlled, multicentre trial},
  author={B M Giannetti and Christiane Staiger and Michael Bulitta and Hans Georg Predel},
  journal={British Journal of Sports Medicine},
  year={2009},
  volume={44},
  pages={637 - 641}
}
Objective The objective was to show the superiority of comfrey root extract ointment to placebo ointment in patients with acute upper or lower back pain. Design The study was conducted as a double-blind, multicentre, randomised clinical trial with parallel group design over a period of 5 days (SD 1). The patients (n = 120, mean age 36.9 years) were treated with verum or placebo ointment three times a day, 4 g ointment per application. The trial included four visits. Main Outcome Measures The… 
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