<prompt> Muscle relaxant not to be used in liver failure:d- TubocurarePancuroniumSuxamethoniumDecamethonium  <response>: Among muscle relaxants metabolism in liver occurs with pancuronium 10-20, vecuronium 20 and biliary excretion occurs with rocuronium 40. vecuronium 30-40 and pancuronium 10. So these agents should be avoided in hepatic diseases. Suxamethonium effect is prolonged in only in severe liver failure due to decreased pseudocholinesterase, so is usually acceptable in mild to moderate cases. 