1Butterworth JF, Strichartz GR. The α2-adrenergic agonists clonidine and guanfacine produce tonic and phasic block of conduction in rat sciatic nerve fibers. Anesth Analg, 1993, 76:295-301.
2Nakamura M, Ferreira SH. Peripheral analgesic action of clonidines mediation by release of endogenous enkephalin-like substances. Eur J Pharmacol, 1988, 146:223-228.
3Reuben SS, Steinberg RB, Madabhushi L, et al. Intravenous regional clonidine in the management of sympathetically maintained pain. Anesthesiology, 1998, 89:527-530.
4Bouaziz H, Tong C, Eisenach JC. Postoperative analgesia from intrathecal neostigmine in sheep. Anesth Analg, 1995,80:1140-1144.