| Beta blockers: Antagonized cardiac-stimulating, bronchodilating, and vasodilating ef-fects of isoproterenol. Monitor child closely. 
 Cardiac glycosides, cyclopropane, halogenated hydrocarbon general anesthetics, potassium-depleting drugs, other drugs that affect cardiac rhythm: Arrhythmias may occur more readily. Use with caution; monitor ECG closely.
 
 Epinephrine, other sympathomimetics: Additive CV reactions. Drugs may be used together if at least 4 hours elapse between administration of the two drugs.
 
 Ergot alkaloids: May increase blood pressure. Monitor blood pressure.
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