This section is from the book "Materia Medica And Therapeutics Inorganic Substances", by Charles D. F. Phillips. Also available from Amazon: Materia medica and therapeutics.
I can entertain no doubt of the power of zinc oxide to control excessive sweating in phthisis and other exhausting diseases, although it has been denied by some observers. Dr. T. Thompson, one of the first to record this effect, found it increased, as we should expect, by conjunction of the zinc with henbane extract - he prescribed 4 gr. of each substance (Medical Times, i., 1854, p. 190); and W. Curran and others have corroborated his observations (Lancet, i., 1854, ii., 18G8). I generally order 1 or 2 gr. of the oxide with the same quantity of extract of henbane, to be taken at bed-time, and again in the course of the night if necessary.