RT Journal Article SR Electronic T1 Caffeine as an analgesic adjuvant: a review of pharmacology and mechanisms of action. JF Pharmacological Reviews JO Pharmacol Rev FD American Society for Pharmacology and Experimental Therapeutics SP 43 OP 85 VO 45 IS 1 A1 J Sawynok A1 T L Yaksh YR 1993 UL http://pharmrev.aspetjournals.org/content/45/1/43.abstract AB