ENHANCES TOXICITY OF FRUSEMIDE AND ETHACRYNIC ACID. POTENTIATES NEUROTOXICITY/NEPHROTOXICITY BY OTHER AMINOGLYCOSIDES, CEPHALORIDINE, POLYMIXIN B, CISPLATIN AND VANCOMYCIN. POTENTIATES NEUROMUSCULAR BLOCKING AGENTS. SYNERGISTIC ACTION WITH BETA LACTUM ANTIBIOTICS. THE NEUROTOXICITY OF AMINOGLYCOSIDES CAN RESULT IN RESPIRATORY PARALYSIS FROM NEUROMUSCULAR BLOCKAGE, ESPECIALLY WHEN THE DRUG IS GIVEN SOON AFTER THE USE OF ANESTHESIA OR OF MUSCLE RELAXANTS. PARENTERAL ADMINISTRATION OF MAG. SALT POTENTIATE THE EFFECTS OF NEUROMUSCULAR BLOCKING AGENTS.