Adverse Reactions:
Nausea, headache, GI distress, vomiting, syncope, hypotension, and other
signs of hypersensitivity, cardiac arrest, basilar artery ischemia,
severe shock, convulsions, death (rare), hives, itching, bronchospasm,
anaphylaxis, pyrexia, transient dyspnea, angioneurotic edema, and slight
dizziness.
Some of these may be related to the site of injection, but the potential
for these kind of side effects does not sound nontoxic to me.