Gaviscon Extra Strength Tablets Are An Over-The-Counter Medication Used To Treat Symptoms Of Heartburn And Acid Reflux. The Tablets Contain A Combination Of Antacids (Such As Sodium Bicarbonate And Calcium Carbonate) And An Alginate, Which Work Together To Neutralize Stomach Acid And Form A Barrier That Prevents Acid From Rising Into The Esophagus. It Provides Fast Relief From Heartburn And Indigestion. Side Effects Common Side Effects: Mild Stomach Upset Or Gas May Occur. Serious Side Effects: Allergic Reactions Such As Rash, Itching, Or Swelling, Though Rare, May Occur. Consult A Healthcare Provider If Side Effects Persist Or Worsen. Precautions Kidney Issues: Gaviscon Should Be Used With Caution In Individuals With Kidney Problems, As It Contains Sodium And Calcium. Pregnancy And Breastfeeding: Generally Considered Safe To Use During Pregnancy, But It Is Advisable To Consult A Healthcare Provider Before Using It. It Is Also Safe For Breastfeeding Mothers.