Dexmedetomidine, Magnesium Sulphate and Lidocaine for Cough Suppression After General Anesthesia

Inclusion Criteria: * Aged 21-60 years. * Both genders. * Body mass index \< 30 kg/ m2 * American Society of Anesthesiology (ASA) physical status I-II. * Mallampati score class I or II. * Patients undergoing surgery under general anesthesia. Exclusion Criteria: * Known allergy to study drugs. * History of psychiatric illness. * Patients with major organ diseases. * Pre-existing neurological deficits. * Body mass index \>30 kg/m2. * Active airway infection or history of tracheal and laryngeal surgery. * Lower esophageal sphincter incompetence (and reflux). * Increased intracranial and intraocular pressure. * Use of cough-inducing medications * Pregnant, and lactating women.