<p>Bradyarrhythmia, hypotension, palpitations, tachyarrhythmia Apprehension, restlessness, confusion, dizziness, headache, somnolence Rash, sweating, Thyroid suppression, Injection site irritation, Muscle twitch, oliguria, renal azotemia, Cardiac dysrhythmia, hemorrhage, decreased platelet aggregation, excessive hypotensive response, Raised intracranial pressure, Metabolic acidosis, Bowel obstruction, Methemoglobinemia, Cyanide poisoning, Thiocyanate toxicity</p>