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If you have severe pulmonary hypertension, your doctor may prescribe medications called calcium channel blockers. These medicines lower blood pressure in the lungs and the rest of the body. If calcium channel blockers arenât enough, your doctor may refer you to a specialized treatment center.
Causes of pulmonary hypertension. The changes in the pulmonary arteries that lead to pulmonary hypertension can be caused by: problems with the smaller branches of the pulmonary arteries (PAH) conditions that affect the left side of the heart. lung diseases or a shortage of oxygen in the body (hypoxia)