OVERDOSAGE
Signs and Symptoms
Overdosage with sympathomimetic amines can cause cardiac arrhythmias, cerebral hemorrhage and pulmonary edema. It can also cause palpitations, restlessness, dizziness, tremor, vomiting, fear, labored breathing, headache, dryness of mouth, pallor, weakness, panic, anxiety, confusion, hallucinations, delirium, hyperactive reflexes, talkativeness, irritability and insomnia. Cardiovascular and renal effects include difficulty in urination, headache, flushing, palpitation, cardiac arrhythmias, hypertension with subsequent hypotension and circulatory collapse. Gastrointestinal effects include dry mouth, anorexia, nausea, vomiting, diarrhea, and abdominal cramps.
Overdosage with guaifenesin is unlikely to produce toxic effects since its toxicity is low. Guaifenesin, when administered by stomach tube to test animals in doses up to 0.5 g/kg produced no signs of toxicity.
Treatment
The patient should be induced to vomit, even if emesis has occurred spontaneously. Pharmacologic vomiting by the administration of ipecac syrup is a preferred method, however, vomiting should not be induced in patients with impaired consciousness. Precautions against aspiration must be taken, especially in infants and children. Following emesis, any drug remaining in the stomach may be absorbed by activated charcoal administered as slurry with water. Treatment of the signs and symptoms of overdosage is symptomatic and supportive.
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CONTRAINDICATIONS
Crantex Liquid® is contraindicated in infants and newborns, and in patients with a known hypersensitivity to any of the components. It is also contraindicated in patients with severe hypertension, severe coronary artery disease, hyperthyroidism, and in patients on MAO inhibitor therapy (or for 14 days after stopping MAOI therapy). Patient idiosyncrasy to adrenergic agents may be manifested by insomnia, dizziness, weakness, tremor, or arrhythmias.
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