Objective: To carry out experiment of Nerve Growth Factor gel on animals.Studies included the pharmacological action,the acute toxicologic action,the dermal irritation and dermal hypersensitivity of the ointment.Methods: Hartely guinea pig 2,4-dinitrofluorbenezene(DNFB) allergic contact dermatitis were used as an animal model,treated with NGF gel.Results: NGF gel had no acute toxicologic action and irritant reaction to skin but had a significant action on dermatitis erythematosa(P<0.01).1200 times the clini...