Imdur is a nitrate that dilates blood vessels, improving blood flow. It can also be used to prevent angina. It cannot treat angina that has already begun.

Stay seated when taking this drug. Do not take more/less than prescribed. Do not stop taking suddenly. 

Inform doctor of all medical conditions and other drugs you take. Imdur interacts with many other drugs, such as erectile dysfunction medicine.

Seek immediate medical attention if you experience serious effects such as: allergic reaction, suspect a heart attack. Other side effects include headache and flushing.