Macitentan (Opsumit) is a prescription medication used to treat pulmonary arterial hypertension (PAH). It is a type of medication known as an endothelin receptor antagonist (ERA). Macitentan works by blocking endothelin receptors, which are proteins found on the surface of cells in the lungs. This helps to reduce the narrowing of the blood vessels in the lungs and improve blood flow. Macitentan has been shown to help improve exercise capacity, delay the progression of PAH, and reduce the symptoms of PAH. It is usually taken once a day with or without food. Common side effects of Macitentan include headache, nausea, muscle pain, and dizziness.
Macitentan is a medication used to manage pulmonary arterial hypertension (PAH), a condition characterized by high blood pressure in the arteries that carry blood to the lungs. Here's a closer look at how it works:
Function: Macitentan belongs to a drug class called endothelin receptor antagonists. It works by blocking the action of endothelin-1, a natural substance that causes blood vessels to narrow. By inhibiting endothelin-1, macitentan helps to relax and widen the blood vessels in the lungs, ultimately lowering blood pressure and making it easier for the heart to pump blood.
Medical Use: Macitentan is prescribed to:
- Reduce Blood Pressure in Lungs: As mentioned earlier, it helps manage PAH by lowering blood pressure in the lungs.
- Improve Exercise Capacity: By improving blood flow, macitentan can enhance a patient's ability to exercise and tolerate physical activity.
- Slow Disease Progression: Macitentan can help delay the worsening of PAH symptoms and reduce the need for hospitalization.
Important Considerations:
- Macitentan comes as a tablet taken orally, typically once a day.
- It's crucial for women of childbearing age to use reliable birth control throughout treatment and for some time after due to the potential risk to a developing fetus.
- Macitentan can cause side effects, including headache, fatigue, sinus congestion, and anemia. It's important to report any concerning side effects to your doctor.