Use of suxamethonium in patients with neuromuscular disorders may risk them with its undesirable side effects such as myalgia, malignant hyperthermia, decreased heart rate, masseter spasm, anaphylaxis, increased intracranial and intraocular pressure, hyperkalemia and prolongation of neuromuscular block in patients with congenital or acquired variations in plasma cholinesterase activity [17, 18]. This evidence concerns the gene BCHE and Myalgia.