▁gra pe f ruit ▁and ▁ruby ▁red ▁gra pe f ruit ▁ju ice . ▁ ▁Gra pe f ruit ▁ju ice ▁is ▁important ▁in ▁medicine ▁because ▁of ▁its ▁interactions ▁with ▁many ▁common ▁dru gs ▁including ▁c aff e ine ▁and ▁medic ations , ▁which ▁can ▁alter ▁how ▁they ▁behave ▁in ▁the ▁body . ▁ ▁Gra pe f ruit ▁ju ice ▁is ▁a ▁common ▁breakfast ▁be verage ▁in ▁the ▁United ▁States . ▁ ▁D rug ▁interactions ▁▁ ▁Gra pe f ruit ▁and ▁gra pe f ruit ▁ju ice ▁have ▁been ▁found ▁to ▁interact ▁with ▁numerous ▁dru gs , ▁in ▁many ▁cases ▁resulting ▁in ▁ad verse ▁effects . ▁ ▁This ▁happens ▁in ▁two ▁ways : ▁one ▁is ▁that ▁gra pe f ruit ▁can ▁block ▁an ▁en zym e ▁which ▁met abol izes ▁medic ation , ▁and ▁if ▁the ▁drug ▁is ▁not ▁met abol ized , ▁then ▁the ▁level ▁of ▁the ▁drug ▁in ▁the ▁blood ▁can ▁become ▁too ▁high , ▁leading ▁to ▁an ▁ad verse ▁effect ; ▁ ▁the ▁other ▁effect ▁is ▁that ▁gra pe f ruit ▁can ▁block ▁the ▁absor ption ▁of ▁dru gs ▁in ▁the ▁int est ine , ▁and ▁if ▁the ▁drug ▁is ▁not ▁absor bed , ▁then ▁not ▁enough ▁of ▁it ▁is ▁in ▁the ▁blood ▁to ▁have ▁a ▁th era pe ut ic ▁effect . ▁ ▁One ▁whole ▁gra pe f ruit ▁or ▁a ▁glass ▁of ▁ ▁of ▁gra pe f ruit ▁ju ice ▁can ▁cause ▁drug ▁over d ose ▁to x icity . ▁Dru gs ▁which ▁are ▁in compatible ▁with ▁gra