Critical Seriousness - A Spasm of the Larynx - Laryngismus is a Life Threatening Side Effect of Demerol Critical Seriousness - Bronchospasm - Bronchospastic Pulmonary Disease is a Life Threatening Side Effect of Demerol Critical Seriousness - Collapsed Portion of Lung - Atelectasis is a Life Threatening Side Effect of Demerol Critical Seriousness - Confused - Impaired Cognition is a Life Threatening Side Effect of Demerol Critical Seriousness - Fast Heartbeat - Tachyarrhythmia is a Life Threatening Side Effect of Demerol Critical Seriousness - Giant Hives - Angioedema is a Life Threatening Side Effect of Demerol Critical Seriousness - Hallucination - Hallucinations is a Life Threatening Side Effect of Demerol Critical Seriousness - Hives - Urticaria is a Life Threatening Side Effect of Demerol Critical Seriousness - Inflammation of Skin caused by an Allergy - Allergic Dermatitis is a Life Threatening Side Effect of Demerol Critical Seriousness - Involuntary Muscle Movements - Involuntary Muscle Movement is a Life Threatening Side Effect of Demerol Critical Seriousness - Itching - Pruritus of Skin is a Life Threatening Side Effect of Demerol Critical Seriousness - Life Threatening Allergic Reaction - Anaphylaxis is a Life Threatening Side Effect of Demerol Critical Seriousness - Rash - Skin Rash is a Life Threatening Side Effect of Demerol Critical Seriousness - Reaction due to an Allergy - Allergic Reactions is a Life Threatening Side Effect of Demerol Critical Seriousness - Seizures - Seizure Disorder is a Life Threatening Side Effect of Demerol Critical Seriousness - Significant Decrease in Lung Function - Respiratory Depression is a Life Threatening Side Effect of Demerol Critical Seriousness - Slow Heartbeat - Bradycardia is a Life Threatening Side Effect of Demerol Critical Seriousness - Temporary Redness of Face and Neck - Flushing is a Life Threatening Side Effect of Demerol Critical Seriousness - Trouble Breathing - Dyspnea is a Life Threatening Side Effect of Demerol Critical Seriousness - Vocal Cord Swelling - Laryngeal Edema is a Life Threatening Side Effect of Demerol |