Final answer:
The antibiotics Ciprofloxacin, a quinolone, and Tetracycline, a tetracycline antibiotic, have chelation interactions with multivitamins and antacids, which can impair their absorption and effectiveness.
Step-by-step explanation:
The two antibiotics that have chelation interactions with multivitamins and antacids are Ciprofloxacin - a quinolone, and Tetracycline - a tetracycline antibiotic. Ciprofloxacin is known to have interactions due to its ability to bind to divalent and trivalent cations found in multivitamins and antacids, which can inhibit its absorption. Similarly, Tetracyclines form chelate complexes with metal ions, impairing the drug's absorption and overall effectiveness.