RT Journal Article SR Electronic T1 Review: cannabinoids and codeine have similar effects on pain relief, but cannabinoids commonly cause psychotropic adverse effects JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 24 OP 24 DO 10.1136/ebm.7.1.24 VO 7 IS 1 YR 2002 UL http://ebm.bmj.com/content/7/1/24.abstract AB