CONCURRENTLY ADMINISTERED WITH ADRENALINE OR OTHER SYMPATHOMIMETICS, THE VENTRICULAR FIBRILLATION MAY OCCUR. CONCURRENT USE WITH CNS DEPRESSANT THAT MAY PRODUCE SYNERGISTIC EFFECT ON THE CNS. THE EFFECT OF COMPETITIVE NEUROMUSCULAR BLOCKERS SUCH AS ATRACURIUM ARE ENHANCED BY NITROUS OXIDE.CONCURRENT USE OF OTHER INHAILATIONAL ANAESTHETICS MAY ACCELERATES THE UPTAKE OF LATER FROM THE LUNGS.HIGH DOSES OF OPIODS LIKE FENTANYL MAY RESULT IN DROP IN HEART RATE AND CARDIAC OUTPUT.