Does anyone know of a formula for preparing a stable 5% doxepin cream to treat itching in Notalgia paraesthetics?

Zonalon Cream:

FOR TOPICAL DERMATOLOGIC USE ONLY-NOT FOR OPHTHALMIC, ORAL, OR INTRAVAGINAL USE. Zonalon (Doxepin hydrochloride) Cream, 5% is a topical cream. Each gram contains: 50mg or Doxepin hydrochloride (equivalent to 44.3 mg or doxepin). Zonalon Cream also contains sorbitol, cetyl alcohol, isopropyl myristate, Glyceryl stearate, PEG-100 stearate, petrolatum, benzyl alcohol, titanium dioxide and purified water.

take the Cetomacrogol cr è me TMF and replace liquid paraffin by Isopropylmyristaat. Delete benzyl alcohol and add 1% TiO2