an older adult client has been prescribed ciprofloxacin (cipro), a fluoroquinolone antibiotic, for treatment of a urinary tract infection (uti). when reviewing the client's history, the health care practitioner notes that this client currently takes magaldrate (aluminum-magnesium complex [riopan]), an antacid for acid indigestion. what should the health care practitioner educate this client about taking these two medications concurrently?