Agitation (aggressiveness, confusion, insomnia). Rare to very rare: Hyperventilation, HTN, hypotension, fatigue, tremor, depression, apathy & stupor, & flu-like symptoms (colds, coughing, resp tract infection); major seizure & convulsion; GI disturbances (lack of appetite, dyspepsia, diarrhoea, constipation, vomiting, nausea); moderate sensation of heat or sweating, vertigo, or palpitation or arrhythmia if inj is performed quickly; local reactions at administration site eg, skin reddening, itching & burning; allergic or hypersensitivity reaction eg, tingling, dermal & local vascular reactions, neck, head & limb pain, fever, slight back pain, dyspnoea, shivering & state similar to shock.