further verapamil absorption studies ( 200 to 360 mg ) performed during svt and sr in five of six patients showed that peak verapamil levels in four patients in svt were 23 % to 71 % lower than in sinus rhythm , where they had peaked at greater than 250 ng/ml 60 minutes post verapamil ingestion , and areas under the plasma concentration time curves were 26 % to 100 % ( mean 67 % ) less in svt than in sr for all five patients .
C0042523
verapamil
C0039240
svt