Calcium Carbonate (Shelcal-HD) is a basic inorganic salt that acts by neutralizing hydrochloric acid in gastric secretions. It also inhibits the action of pepsin by increasing the pH and via adsorption. Cytoprotective effects may occur through increases in bicarbonate ion (HCO3-) and prostaglandins. Neutralization of hydrochloric acid results in the formation of calcium chloride, carbon dioxide and water. Approximately 90% of calcium chloride is converted to insoluble calcium salts (e.g. Calcium Carbonate (Shelcal-HD) and calcium phosphate).

Let your doctor know if you are allergic to Shelcal-HD Tablet 15's or its inActive components. Shelcal-HD Tablet 15's is not recommended if you have hypercalcaemia (high calcium levels), hypervitaminosis D (high vitamin D levels), and malabsorption syndrome (difficulty absorbing nutrition from food). Brief your medical history if you have any heart/kidney/liver/blood vessel diseases, kidney stones, sarcoidosis (growth of inflammatory cells in different parts of the body), Crohn's disease (inflammatory bowel disease), Whipple's disease (bacterial infection affecting joints and digestive system), achlorhydria (little or no stomach acid), low levels of bile, and phosphate imbalance. Chewable and dissolving tablets of Shelcal-HD Tablet 15's contain sugar or aspartame, hence caution should be taken if you have diabetes and phenylketonuria (increased levels of an amino acid called phenylalanine). Higher doses of Vitamin D than the recommended daily dose should be used in pregnant women only when advised by the doctor. Shelcal-HD Tablet 15's is excreted into the breast milk, hence consult your doctor before taking Shelcal-HD Tablet 15's if you are a breastfeeding mother. Drinking alcohol can affect calcium absorption, therefore, it is advised to limit the alcohol intake while using Shelcal-HD Tablet 15's. Shelcal-HD Tablet 15's is safe to use in children when prescribed by the doctor. Do not store Shelcal-HD Tablet 15's above 25°C.