because a precipitate formed when verapamil hydrochloride was added to nafcillin sodium , oxacillin sodium , ampicillin sodium , or mezlocillin sodium in the diluents studied , we recommended that verapamil hydrochloride be administered separately or that the i.v . tubing be flushed thoroughly before and after this drug is administered through a y-injection site with these penicillin admixtures .
C0037531
nafcillin sodium
C0030842
penicillin