Gastren Duo Suspension is a pharmaceutical product containing calcium carbonate, magnesium carbonate, and sodium alginate in a 100ml suspension form. This medication is manufactured by Pharmactive and is designed to provide gastrointestinal relief. As this is a medicinal product, please consult your healthcare provider before use. The medication comes in a 100ml bottle and contains active ingredients including calcium carbonate, magnesium carbonate, and sodium alginate. Store according to package instructions and keep out of reach of children.