WARNINGS
Especially in infants and small children, antihistamines in overdosage may cause hallucinations, convulsions, and death.
Antihistamines may diminish mental alertness. In the young child, they may produce excitation.
PRECAUTIONS
General
Because of its antihistamine component, Myphetane DX Cough Syrup should be used with caution in patients with a history of bronchial asthma, narrow angle glaucoma, gastrointestinal obstruction, or urinary bladder neck obstruction. Because of its sympathomimetic component, Myphetane DX Cough Syrup should be used with caution in patients with diabetes, hypertension, heart disease, or thyroid disease.
Information for Patients
Patients should be warned about engaging in activities requiring mental alertness, such as driving a car or operating dangerous machinery.
Drug Interactions
Monoamine oxidase (MAO) inhibitors-Hyperpyrexia, hypotension, and death have been reported coincident with the coadministration of MAO inhibitors and products containing dextromethorphan. In addition, MAO inhibitors prolong and intensify the anticholinergic (drying) effects of antihistamines and may enhance the effect of pseudoephedrine. Concomitant administration of Myphetane DX Cough Syrup and MAO inhibitors should be avoided (see CONTRAINDICATIONS).
Central nervous system (CNS) depressants
Antihistamines have additive effects with alcohol and other CNS depressants (hypnotics, sedatives, tranquilizers, antianxiety agents, etc.).
Antihypertensive drugs
Sympathomimetic may reduce the effects of antihypertensive drugs.
Carcinogenesis, Mutagenesis, Impairment of Fertility
Animal studies of Myphetane DX Cough Syrup to assess the carcinogenic and mutagenic potential or the effect on fertility have not been performed.
Pregnancy
Teratogenic Effects
Pregnancy Category C
Animal reproduction studies have not been conducted with Myphetane DX Cough Syrup. It is also not known whether Myphetane DX Cough Syrup can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity. It should be given to a pregnant woman only if clearly needed.
Reproduction studies of brompheniramine maleate (a component of Myphetane DX Cough Syrup) in rats and mice at doses up to 16 times the maximum human doses have revealed no evidence of impaired fertility or harm to the fetus.
Nursing Mothers
Because of the higher risk of intolerance of antihistamines in small infants generally, and in newborns and prematures in particular, Myphetane DX Cough Syrup is contraindicated in nursing mothers.
Pediatric Use
Safety and effectiveness in pediatric patients below the age of 6 months have not been established (see DOSAGE AND ADMINISTRATION).
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