Advair is a combination of Fluticasone, a corticosteroid, is the anti-inflammatory component of the combination, and salmeterol, a long acting beta-adrenoceptor agonist, treats constriction of the airways. Together, they help prevent symptoms of coughing, wheezing and shortness of breath. It may sometimes cause shakiness but other Asthma medications are causing it more frequently. I would suggest consulting with your physician before changing the dose, it might make more sense choosing a different drug altogether.