Administer supplemental oxygen by mask to patients who have respiratory symptoms. Use extreme caution when treating patients who have bronchospasm with aerosolized bronchodilators. The use of bronchial sensitizing agents in situations of multiple chemical exposures may pose additional risks. Consider the health of the myocardium before choosing which type of bronchodilator should be administered. Cardiac sensitizing agents may be appropriate; however, the use of cardiac sensitizing agents after exposure to certain chemicals may pose enhanced risk of cardiac arrhythmias (especially in the elderly). Wherever possible avoid the use of sympathomimetics in benzene exposed patients. Try to avoid administering epinephrine due to the possible myocardial sensitizing effect of benzene.