A carminative, also known as carminativum (plural carminativa), is a herb or preparation that either prevents formation of gas in the gastrointestinal tract or facilitates the expulsion of said gas, thereby combating flatulence. Carminatives have been shown to decrease lower esophageal pressure, which on the other hand increases the risk of Gastroesophageal Reflux Disease (GERD) or 'heartburn'.[1]
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Carminatives are often mixtures of essential oils and herbal spices with a tradition in folk medicine for this use. Examples:
Modern drugs used for the same purpose include simethicone, which, rather than having physiological activity, simply lowers the surface tension of gas bubbles. See anti-foaming agent.