Hainan Huiyuantang Pharmaceutical Co Ltd

Primary objective: To evaluate the bioequivalence of the test preparation (lidocaine gel patch produced by Hainan Huiyuantang Pharmaceutical Co., Ltd., specification 5%) and the reference preparation (lidocaine gel patch produced by Teikoku Seiyaku Co., Ltd., specification 5%, trade name: Lidoderm®) under the condition of topical use in Chinese healthy subjects, using the in vivo pharmacokinetic parameters (Cmax and AUC) of lidocaine as the evaluation indicators of bioequivalence; to evaluate the non-inferiority of the test preparation and the reference preparation under the condition of topical use in Chinese healthy subjects, using the average adhesion score of lidocaine as the evaluation indicator of non-inferiority. Secondary objective: To observe the skin irritation and safety of the test preparation and the reference preparation under the condition of topical use in Chinese healthy subjects.

To evaluate the efficacy and safety of lidocaine gel in the treatment of postherpetic neuralgia compared with placebo