Critical Seriousness - Abnormally Low Blood Pressure - Hypotension is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Allergic Reaction caused by a Drug - Hypersensitivity Drug Reactions is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Allergic Reaction causing Inflammation of Blood Vessels - Hypersensitivity Angiitis is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Allergic Reaction causing Serum Sickness - Serum Sickness is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Decreased Blood Platelets - Thrombocytopenic Disorder is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Decreased Neutrophils a Type of White Blood Cell - Neutropenic Disorder is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Decreased White Blood Cells - Leukopenia is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Deficiency of Granulocytes a Type of White Blood Cell - Agranulocytosis is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Destruction of Red Blood Cells by Body's Own Antibodies - Autoimmune Hemolytic Anemia is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Erythema Multiforme is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Hepatitis caused by Drugs - Drug-Induced Hepatitis is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Hives - Urticaria is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Increased Eosinophils in the Blood - Eosinophilia is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Interstitial Nephritis is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Life Threatening Allergic Reaction - Anaphylaxis is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Mental Impairment is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Puffy Face from Water Retention - Facial Edema is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Rash - Skin Rash is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Reaction due to an Allergy - Allergic Reactions is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Seizures - Seizure Disorder is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Severe Bloody Diarrhea from Antibiotics - Pseudomembranous Enterocolitis is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Skin Rash with Sloughing - Exfoliative Dermatitis is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Stevens-Johnson Syndrome is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - The Appearance of Crystals in the Urine - Crystalluria is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Toxic Epidermal Necrolysis is a Life Threatening Side Effect of Penicillin V Potassium Critical Seriousness - Trouble Breathing - Dyspnea is a Life Threatening Side Effect of Penicillin V Potassium |