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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.
Happily, the low dose of quinine found in a glass or two of tonic water isn't enough to trigger these issues in most people. However, for the unlucky few, even the small amount of quinine in tonic water can cause thrombocytopenia (doctors call this rare occurrence a gin and tonic purpura).oday, tonic water still contains quinine, but the roles are reversed: a diluted, sweeter formulation of tonic water helps guide gin and vodka past the tonsils instead.