This section is from the "A Handbook of Useful Drugs" book, by State Medical Examining and Licensing Boards.
Effervescent salts are mixtures of soluble salts with sodium bicarbonate and citric or tartaric acid, or a mixture of the two acids, designed to yield effervescent drafts when added to water.
For preparations included in this list see:
Magnesii Sulphas Effervescens, under Magnesii Sulphas.
Potassii Citras Effervescens, under Potassii Citras.
Pulvis Effervescens, under Potassii et Sodii Tartras.
Sodii Phosphas Effervescens, under Sodii Phosphas.