The quinine was added to the drink as a prophylactic againstmalaria, since it was originally intended for consumption intropical areas of India and Africa where that disease is endemic.
Tonic water originally contained only carbonated water andquinine, and it contained a large amount of the latter. However,most tonic water today contains a medically insignificant amount ofquinine, and is thus used for its flavor only. It is consequentlyless bitter, and is also usually sweetened. Some manufacturers alsoproduce diet tonic water.
Tonic water is often used as a mixer for alcoholic spirits,especially gin (the mixture commonly known as a gin and tonic).
Tonic water with lemon or lime flavor added is known as bitterlemon or bitter lime, respectively. Such soft drinks are morepopular in Europe than in the United States.
Tonic water will glow under ultraviolet light, due to the quininein it.
Brands of tonic water:
Generic terms for carbonated soft drinks vary widely in theUnited States. Probably the two most common words competing forprecedence are soda, used in the northeast United States, and pop,used from the Midwest westward. In the South all soft drinks,regardless of the flavor or brand name, are referred to as colddrinks. Speakers in Boston and its environs have a term of theirown: tonic. Such a variety of regional equivalents is unusual for aproduct for which advertising is so aggressive and universal;usually advertising has the effect of squeezing out regionalvariants. On the other hand, because there are so many types andflavors of soft drinks, perhaps no single generic word has everemerged to challenge the regionalisms.
在美国，含碳软饮料的名称各地截然不同。其中有两个词正竞争着统治地位，一个是用于美国东北部的soda, ，另一个是用于中西部以西的pop 。 在美国南部，所有的软饮料，不管味道或品牌如何，都统统叫作cold drinks 。波士顿及其周围地区有其自己的名称：tonic 。对于一种广告做得满天飞的产品来说，这种各地区名字不同的情况十分不寻常；因为广告通常有减弱方言的作用。另一方面，由于软饮料有如比多的种类和风格，所以可能还没有哪一个泛称能够取代这么多地方变体