<prompt> Gadzira shanduro yakaoma zvikuru yemutsara uyu kudzivirirwa kwechivimbiso chePfizer paNorvasc kwakapfuurira kusvikira muna 2007.  <response>: Chokwadika, shanduro yakaoma kunzwisisa zvikuru yemutsara wacho ndeiyi kudzivirirwa kwechivimbiso chePfizer paNorvasc kwakatora kusvikira muna 2007, kupera kwechivimbiso chose kwakaitika gare gare muna 2007. 