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warnings
WARNINGS This product should be prescribed with caution in patients with persistent or chronic cough such as occurs with smoking, asthma, or emphysema, or where cough is accompanied by excessive secretions. Advise patients to take medication a few hours before bedtime to minimize the possibility of sleeplessness. The medication should be taken with a glass of water after each dose, to help loosen mucus in the lungs. Use with caution in patients with hypertension, cardiovascular disease, hyperthyroidism, diabetes mellitus, narrow angle glaucoma or prostatic hypertrophy.
ADVERSE REACTIONS Adverse effects associated with phenylephrine may include nervousness, restlessness, and headache. Adverse effects associated with antihistamines may include drowsiness, sedation, dryness of mucous membranes, and gastrointestinal effects. Serious side effects with oral antihistamines or sympathomimetics have been rare. Guaifenesin is well tolerated and has a wide margin of safety. Side effects have been generally mild and infrequent. Nausea and vomiting are the side effects that occur most commonly. Dizziness, headache, and rash (including urticaria) have been reported rarely.