Common starch, with the addition of Tincture of Opium, is the most
common and convenient form for this purpose. See also _Assafœtida_,
_Terebinthinæ Oleum_, and _Formulæ 8, 9, 29, 30_. In some cases the
injection of _cold water_ acts as a powerful astringent, and from its
impression upon the rectum, will frequently afford instantaneous relief
in the piles.