Antinociceptive effect and acute toxicity of the essential oil of Hyptis fruticosa in mice. - Menezes,I.A.; Marques,M.S.; Santos,T.C.; Dias,K.S.; Silva,A.B.; Mello,I.C.; Lisboa,A.C.; Alves,P.B.; Cavalcanti,S.C.; Marçal,R.M.; Antoniolli,A.R. (Fitoterapia, 2007)