A preparation method of an external patch for preoperative
sedation relates to the field of medical preparations containing organic effective components, and sequentially comprises the steps of preparing a main component pretreatment substance, preparing a
matrix solution, preparing an ointment-containing paste and synthesizing the patch, the preparation method of the main component pretreatment substance comprises the following steps: preparing a mixed liquid by taking
dexmedetomidine hydrochloride and floperidol as main components, carrying out
spray granulation to obtain a composite
solid dispersion, crushing the composite
solid dispersion into
powder, and mixing and stirring the
powder with paraffin oil and superfine silica
powder. In the patch prepared from
dexmedetomidine hydrochloride and floperidol, the effective components can quickly penetrate through the
skin mucous membrane, so that the effect of quickly taking effect is achieved, and a good
sedative effect is achieved. The dispersion uniformity of main components in the patch is excellent, the RSD is within 2%, and the effect consistency of the patch is guaranteed. According to the
dexmedetomidine hydrochloride tablet, the stability of
dexmedetomidine hydrochloride is effectively improved, components are prevented from being decomposed in the long-term storage process, other impurities are not generated, and the
shelf life is effectively prolonged to 24 months.