Angiwell CR 2.6 Tablet is used to prevent and treat angina (chest pain). It contains Nitroglycerin, which works by relaxing the blood vessels and lowering the workload on the heart. Sometimes, you may experience side effects such as dry mouth, headache, blurred vision, insomnia, tingling, and prickling sensations. Before taking this medicine, you should tell your doctor if you are allergic to any of its components or if you are pregnant/breastfeeding, and about all the medications you are taking and pre-existing medical conditions.