Do not take FOSAVANCE (1) if you are allergic (hypersensitive) to alendronate sodium trihydrate, colecalciferol or any of the other ingredients, (2) if you have certain problems with your gullet (oesophagus - the tube that connects your mouth, with your stomach) such as narrowing or difficulty swallowing, (3) if you cannot stand or sit upright for at least 30 minutes, (4) if your doctor has told you that you have low blood calcium.