मावथाय होबथाग्राफोरआ ( प्रेक्तलल आरो प्रप्रेनल ) हार आरो मैखुननि नारसिनथायनि गोहोखौ खमायो आरो कारदियाक दिहुनथायखौ खमायो ।
Beta blockers practolol and propranolol reduce the rate and force of the contraction of heart and reduce the cardiac output .