Cimetidine tagamet ; digoxin digitalis, lanoxin ; levothyroxine synthroid ; phenytoin dilantin ; quinidine quin-g ; ranitidine zantac ; tetracycline ala-tet, brodspec, panmycin, sumycin, tetracap ; theophylline elixophyllin, theo-24, theochron, uniphyl, and others ; a blood thinner such as warfarin coumadin, jantoven ; or certain antibiotics such as ciprofloxacin cipro , levofloxacin levaquin , lomefloxacin maxaquin , ketoconazole nizoral , and others.
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