Tissa. Tissa rubra, Spergularia rubra.
Tissa. Tissa rubra (L.) Brit. [now Spergularia rubra (L.) J. and C. Presl.], is a native of Malta, Sicily, and Algiers, and is found growing in dry, sandy soil from Quebec to Virginia. It has long been used as a popular remedy in diseases of the bladder. It was shown by F. Vigier (J. P. C., 1879, ii, p. 371) to contain a resinous aromatic substance which is probably its active principle. It is strongly recommended by Bertherand in calculous diseases and acute and chronic cystitis. The aqueous extract may be given in doses of thirty grains (2.0 Gm.); or the fluidextract, dose, a fluidrachm (3.75 mils), three or four times a day.