Cardiovascular: bradycardia, cardiac arrest, ECG change including blunting of T-wave and prolongation of the QT interval, excitability, extrasystoles, hypertension, hypotension, palpitation, postural hypotension, reflex tachycardia, tachycardia, reflex bradycardia, arrhythmia (rare), precordial pain or discomfort, pallor, severe peripheral and visceral vasoconstriction, severe decreased cardiac output.
Central nervous system: anxiety, disturbed coordination, dizziness, drowsiness, faintness, sedation, acute labyrinthitis, blurred vision, catatonic-like states, confusion, convulsion, diplopia, disorientation, nightmare, euphoria, excitation, fatigue, hallucination, headache, hysteria, insomnia, lassitude, neuritis, oculogyric crisis, paresthesia, pseudoschizophrenia, restlessness, tinnitus, tongue protrusion (usually in association with excessive dosage), torticollis, tremor, vertigo, weakness, extrapyramidal reactions may occur with high doses.
Gastrointestinal: epigastric distress, anorexia, constipation, diarrhea, increased appetite, nausea, stomatitis, vomiting, weight gain, stomach pain.
Endocrine & metabolic: metabolic acidosis.
Neuromuscular & skeletal: pilomotor response, weakness.
Renal: decreased renal perfusion, reduced urine output.
Respiratory: respiratory distress.
Expectorant: Dermatologic: rash.
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