Vitamin B12 in low back pain: a randomised, double-blind, placebo-controlled study.

OBJECTIVES The objective of this double-blind randomised, placebo-controlled study was to examine the efficacy and safety intramuscular vitamin B12 (Tricortin 1000) in the treatment of low back pain in patients with mechanical or irritative lumbago. METHODS 60 patients aged between 18 and 65 years with lumbago or sciatic neuritis of mechanical origin without need for surgical procedures were enrolled. Patients had to present with a proven medical history for back pain (lasting from 6 months to 5 years) and a pain intensity [as evaluated with a Visual Analogic Scale (VAS)] equal or greater than 60 mm. Efficacy primary end-point was evaluated by means of a visual analogic scale (VAS) and a Disability Questionnaire (DQ). Consumption of paracetamol during the study period was the secondary efficacy end-point. RESULTS Both treatment groups experienced a sharp decrease in pain and disability. However, comparison between groups at the end of the treatment period showed a statistically significant difference in favour of the active treatment both for VAS and DQ (p < 0.0001 and p < 0.0002, respectively). Consumption of paracetamol proved significantly higher in the placebo group than in the active treatment (p < 0.0001). CONCLUSIONS The efficacy and safety of parenteral Vitamin B12 in alleviating low back pain and related disability and in decreasing the consumption of paracetamol was confirmed in patients with no signs of nutritional deficiency.