Use with caution in heart disease, high blood pressure, hyperthyroidism, diabetes, arrhythmias and seizure disorders. May cause dizziness/tremor—avoid driving if affected. Do not exceed recommended dose; seek medical advice if cough persists, worsens, or is accompanied by high fever, chest pain, or blood in sputum. Use caution in children and elderly; not recommended for self-medication in young children without medical advice.