<prompt> Which of the following is not used in the treatment of Pulmonary hypeensionCalcium channel blockersAlpha blockersProstacyclinEndothelin receptor antagonist  <response>: Refer CMDT 2010381 management of of idiopathic Pulmonary hypeension if the patient respond to vasodilators the Calcium channel blockers including amlodipine diltiazem and Nifedipin are the first line agents of drugs other drugs that can be used are phosphodiesterase inhibitorssildenafil Prostacyclin analogueepoprostenol Endothelin receptor blockersbosenton 