2.2 Placebo
plaster
Placebo is provided by Hunan Lao TCM Pharmaceutical Co., Ltd., which can simulate the appearance, color and odor of the formula using new technology, but has no active ingredients and therefore has no efficacy. Placebo plaster is indistinguishable from Guilu Erxian plaster in appearance and taste. The method of administration was the same as Guilu Erxian Ointment.