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Tonic water, also known as Indian tonic water, is a soft drink, carbonated in nature with an additive called as Quinine, which is commonly used in combination with other drinks, like gin. Quinine is actually a medicine, which was used as a prophylactic agent against malaria, whose content has been reduced in tonic. Since it has medicinal effects due to addition of quinine, it got the name Tonic. Tonic water was intended to be used in South Asian and African regions, which has high cases of malaria.
A. Quinine has been used medicinally to ward off malaria since the 17th century. The normal dose to treat malaria is 648 mg every eight hours for a week. A glass of tonic has roughly 20 mg, so you can see that there is a big difference in dose.