| abstract |
An antacid composition which comprises n na) a substance which is soluble in water at a neutral or alkaline pH, but which is capable of forming a cohesive gel at an acid pH, nb) a substance which is capable of acting as a buffer and which is capable of being captured in the gel structure formed by substance a) at an acid pH, and nc) one or more acid neutralising agents capable of being trapped in the gel structure formed by substance a) at an acid pH, at least one of which causes the gel to foam when contacted with an acid, n nthe composition being formulated so that substance a) is dissolved before ingestion of the composition and having raft-forming properties in a gastric environment. |