ADVERSE REACTIONS The most frequent adverse events reported as drug-related or unknown relationship to study drug in the 78 patients and 63 normal volunteers who received fomepizole injection were headache (14%), nausea (11%), and dizziness, increased drowsiness, and bad taste/metallic taste (6% each). All other adverse events in this population were reported in approximately 3% or fewer of those receiving fomepizole and were as follows: Body as a Whole : Abdominal pain, fever, multiorgan system failure, pain during fomepizole injection, inflammation at injection site, lumbalgia/backache, hangover. Cardiovascular : Sinus bradycardia/bradycardia, phlebosclerosis, tachycardia, phlebitis, shock, hypotension. Gastrointestinal : Vomiting, diarrhea, dyspepsia, heartburn, decreased appetite, transient transaminitis. Hemic/Lymphatic : Eosinophilia/hypereosinophilia, lymphangitis, disseminated intravascular coagulation, anemia. Nervous : Lightheadedness, seizure, agitation, feeling drunk, facial flush, vertigo, nystagmus, anxiety, "felt strange", decreased environmental awareness. Respiratory : Hiccups, pharyngitis. Skin/Appendages : Application site reaction, rash. Special Senses : Abnormal smell, speech/visual disturbances, transient blurred vision, roar in ear. Urogenital : Anuria