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How does nifedipine treat angina?

Nifedipine treats angina (a type of chest pain caused by insufficient oxygen getting to the heart muscle) by blocking the normal narrowing effect of calcium on blood vessels. When blood vessels remain wide, more oxygen-rich blood can flow to the heart. This process also lowers blood pressure in the rest of the body which makes it easier for the heart to push the blood around the body. The total effect is that the heart needs less oxygen and it gets more oxygen simultaneously.

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