1) Antihypertensive agent 
<chemical> 1,4-dihydrazinophthalazine. An antihypertensive agent with actions and uses similiar to those of hydralazine. ... Pharmacological action: antihypertensive agents. ... Chemical name: 1,4-Phthalazinedione, 2,3-dihydro-, dihydrazone ... (12 Dec 1998) ...