effervescent salt

ef·fer·ves·cent salt

Any of the preparations made by adding sodium bicarbonate and tartaric and citric acids to a medicinally active salt.
References in periodicals archive ?
an effervescent salt gargle for soothing sore throats, produced by Scottsdale, Ariz.
Some people find effervescent salts, such as liver salts, help," says Angela Chalmers, Boots pharmacist.
Peppermint Foot Soak (pounds 7) is a revitalising treat, containing effervescent salts to cool cleanse and refresh.