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.
The efficacy of arsenic in this form of venous congestion has been sometimes well shown; thus, in one case, a gentleman had suffered for many years, and had undergone cauterizing and other operations, when this remedy was given to him for hay-asthma, and he found his hemorrhoids to be more relieved in a few days than under any other treatment. Relapses occurred more than once, but always yielded in a few days to 8-min. doses of Fowler's solution (Parvin, in Braithwaite's Retrospect, ii., 1866). I can recommend it strongly in painful hemorrhoids, and also for ordinary external piles.