Spectrophotometric determination of some cardiovascular drugs

The present work described two accurate and selective colorimetric methods for the determination of some cardiovascular drugs. The first method comprises the reaction of DDQ with dipyridamole, celiprolol and diltiazem to develop highly colored radical anion. In the second method Fe [III] hydroxamate reacts with chromonar hydrochloride or diltiazem hydrochloride to produce red colored complex