Magnesium carbonateis one of many salts of magnesium used clinically. The carbonate and other salts, such as trisilicate, citrate, oxide and sulfate, are used widely for relief of gastrointestinal symptoms ofdyspepsia,heartburn,gastroesophageal reflux disease, and constipation, by acting asantacidsand laxatives. Although the carbonate is only used as anantacidor laxative, some salts may also have other uses as indicated in records for the individual salts. The sulfate salt, in particular, has many additional medical uses and the reader is referred particularly to the record formagnesium sulfate. Like several othermagnesium salts, the carbonate is rarely given alone and is usually combined with other antacids. The anion attached to the magnesium can affect thepharmacokineticsand the delivery of the elemental magnesium to the target siteRanade and Somberg (2001),Dollery (1999),Sweetman (2002).Magnesium carbonateis one of many salts of magnesium used clinically. The carbonate and other salts, such as trisilicate, citrate, oxide and sulfate, are used widely for relief of gastrointestinal symptoms ofdyspepsia,heartburn,gastroesophageal reflux disease, and constipation, by acting asantacidsand laxatives. Although the carbonate is only used as anantacidor laxative, some salts may also have other uses as indicated in records for the individual salts. The sulfate salt, in particular, has many additional medical uses and the reader is referred particularly to the record formagnesium sulfate. Like several othermagnesium salts, the carbonate is rarely given alone and is usually combined with other antacids. The anion attached to the magnesium can affect thepharmacokineticsand the delivery of the elemental magnesium to the target siteRanade and Somberg (2001),Dollery (1999),Sweetman (2002).