A similar drug, Formoterol (Combined with the inhaled steroid, Budesonide, in the drug
Symbicort) while in the same class, might not have the same properties and perhaps might not exhibit the same cardiac stimulatory effect as Serevent. You might want to discuss this with your doctor.
Another approach might be to avoid these two combination drugs, Advair and Symbicort, and substitute individual inhalert for each of the two drugs (the inhaled steroid and the beta-agonist).