Many people drink tereré with added medicinal herbs, both medicinal and refreshing. In northeastern Argentina it is commonly prepared either with water, medicinal herbs and ice cubes (called "tereré de agua" (tereré prepared with water)) or citrus, as in south-western Brazil, fruit juices like: lemon, lime, orange or pineapple. Although this practice varies depending on the region, since in Formosa Province (Argentina) it is more normally prepared with medicinal herbs. In Paraguay it is usually prepared with medicinal herbs, with the exception of the citrus juice preparation which is often prepared in the South of that country. Mixing fruit juices with tereré is commonly called "tereré de jugo" (tereré prepared with juice)-in northeastern Argentina- or "tereré ruso" (Russian tereré) -more used in Paraguay- because this practice is more common with Slavic immigrants in the northeast of Argentina and southern paraguay.