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July 27, 2026Sources cited
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Tonic water

Tonic water is a carbonated soft drink flavoured with quinine, which gives it a distinctive bitter taste.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 27, 2026|2 min read| Fact-checked

Tonic water is a carbonated soft drink flavoured with quinine, giving it a distinctive bitter taste. It originated as a medicinal drink used against malaria and later became a common mixer, especially in the gin and tonic. In Canada, tonic water is widely sold as a mixer and soft drink, familiar through the gin and tonic.

History

Tonic water developed from quinine-based preparations used in tropical regions to help prevent malaria. Commercial tonic water emerged in Britain in the 19th century, including early products such as Pitt’s Aerated Tonic Water.

Composition

Traditional tonic water is carbonated water with dissolved quinine. Contemporary versions often include sugar or other sweeteners, along with flavourings to balance quinine’s bitterness.

Use in cocktails

Tonic water is best known as a mixer, particularly in the gin and tonic. Its bitterness and carbonation make it a standard ingredient in many mixed drinks.

Botanical source of quinine

Quinine is extracted from cinchona bark, from trees native to South America’s Andean region. The bark’s bitter compounds made it useful medicinally before becoming a flavouring ingredient.

Key facts

  • Quinine is the ingredient that gives tonic water its characteristic bitterness.
  • The quinine used in tonic water comes from the bark of cinchona trees.
  • Tonic water began as a prophylactic against malaria and later became a recreational beverage.
  • Modern tonic water is generally sweeter and contains less quinine than earlier medicinal forms.
  • It is widely used as a mixer, especially with gin.
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Canadian context

Tonic water is widely sold in Canada as a mixer and soft drink, especially in bars and grocery stores, and is familiar to Canadian readers through the gin and tonic.

Frequently asked questions

What is tonic water?
Tonic water is a carbonated soft drink flavoured with quinine and known for its bitter taste.
Why is tonic water bitter?
Its bitterness comes from quinine, an alkaloid extracted from cinchona bark.
Was tonic water originally a medicine?
Yes. It originated as a quinine-containing drink used to help prevent malaria.
What is tonic water commonly mixed with?
It is most commonly mixed with gin in the gin and tonic.
Does modern tonic water contain the same amount of quinine as older versions?
No. Modern tonic water usually contains less quinine and is often more sweetened than earlier medicinal versions.

References

  1. Wikipediahttps://en.wikipedia.org/wiki/Tonic_water
    Supports: Defines tonic water as a carbonated soft drink with dissolved quinine and notes its medicinal origins and modern reduced quinine content.
  2. Royal Botanic Gardens, Kewhttps://www.kew.org/read-and-watch/just-the-tonic-history
    Supports: Explains that tonic water’s bitter flavour comes from quinine extracted from cinchona bark.
  3. Imbibe Magazinehttps://imbibemagazine.com/tracing-the-history-of-tonic-water/
    Supports: Describes the cinchona tree, quinine, and the mid-19th-century commercial history of tonic water.
  4. Smithsonian Magazinehttps://www.smithsonianmag.com/innovation/gin-and-tonic-is-a-cocktail-with-a-storied-history-dont-overlook-scotlands-connection-to-the-classic-180988875/
    Supports: Covers the commercial emergence of tonic water in Britain and its association with gin and tonic.