A single dose placebo-controlled study to assess the effectiveness of adding a muscle relaxant to a compound analgesic in the treatment of tension headache.

A patient-assessment of pain relief over 4 hours following a single dose of a compound analgesic has shown that 78% of patients achieve satisfactory relief of pain due to tension headache and that this response is enhanced by the addition of chlormezanone, an agent with reported anxiolytic and muscle relaxant actions. Side-effects were minor in nature.