Nitro-Bid Nitroglycerin Ointment 2% Foil Packets 1 gram Size, 48/Box (Rx)Nitro Bid Ointment is a prescription medication used to prevent and treat chest pain (angina) in patients with coronary artery disease. The ointment contains nitroglycerin, which works by relaxing and widening blood vessels, improving blood flow to the heart, and reducing its workload. As a result, it helps to alleviate symptoms of angina and decrease the risk of further heart related complications. It should be applied to the skin, avoiding hair and