“…14 In addition to NSAIDs and opioids, other therapies used for the treatment of CLBP include antidepressants, paracetamol (acetaminophen), muscle relaxants and steroids. 15 Although NSAIDs and opioids are the most widely used of these treatments, there is still a lack of sufficient evidence regarding their effectiveness in managing CLBP 3,14,16,17 or in improving daily functioning, 3,14,16 -21 whilst concerns regarding their long-term safety and tolerability still exist. 17,19,22,23 The aim of the two randomized, parallelgroup studies reported here was to compare the analgesic efficacy, tolerability and safety of celecoxib, a cyclo-oxygenase-2 (COX-2) selective NSAID, and tramadol hydrochloride (HCl), a 'weak' opioid with relatively low addiction potential, in patients with CLBP.…”