PARENTERAL ADMINISTRATION OF MAG. SALT POTENTIATE THE EFFECTS OF NEUROMUSCULAR BLOCKING AGENTS. NEUROMUSCULAR BLOCKING EFFECTS OF MAG. SALT AND AMINOGLYCOSIDE ANTIBIOTICS AND NIFEDEPINE MAY BE ADDITIVE. ORAL MAG SALTS DECREASE THE ABSORPTION OF TETRACYCLINES, BISPHOSPHONATES, AND SHOULD BE SEPARATED BY SEVERAL HOURS.