ADVERSE REACTIONS
Dextromethorphan:
Dextromethorphan hydrobromide occasionally causes slight drowsiness, dizziness, and gastrointestinal disturbances.
Promethazine:
Central Nervous System – Drowsiness is the most prominent CNS effect of this drug. Sedation, somnolence, blurred vision, dizziness; confusion, disorientation, and extrapyramidal symptoms such as oculogyric crisis, torticollis, and tongue protrusion; lassitude, tinnitus, incoordination, fatigue, euphoria, nervousness, diplopia, insomnia, tremors, convulsive seizures, excitation, catatonic-like states, hysteria. Hallucinations have also been reported.
Cardiovascular – Increased or decreased blood pressure, tachycardia, bradycardia, faintness.
Dermatologic – Dermatitis, photosensitivity, urticaria.
Hematologic – Leukopenia, thrombocytopenia, thrombocytopenic purpura, agranulocytosis.
Gastrointestinal – Dry mouth, nausea, vomiting, jaundice.
Respiratory – Asthma, nasal stuffiness, respiratory depression (potentially fatal) and apnea (potentially fatal). (See
WARNINGS –
Promethazine;
Respiratory Depression.)
Other – Angioneurotic edema. Neuroleptic malignant syndrome (potentially fatal) has also been reported. (See
WARNINGS –
Promethazine;
Neuroleptic Malignant Syndrome.)
Paradoxical Reactions – Hyperexcitability and abnormal movements have been reported in patients following a single administration of promethazine HCl. Consideration should be given to the discontinuation of promethazine HCl and to the use of other drugs if these reactions occur. Respiratory depression, nightmares, delirium, and agitated behavior have also been reported in some of these patients.
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