The main side effects of budesonide formoterol powder inhaler are tremor and palpitations. Budesonide formoterol powder inhaler is an important medication for the treatment of bronchial asthma and other diseases, it contains the side effects of both budesonide and formoterol, and the side effects of both medications can also occur while using budesonide formoterol powder inhaler. There is no increase in the incidence of side effects after combining the two medications. The most common side effects are tremors and palpitations, which usually diminish or disappear within a few days after treatment. Budesonide Formoterol Powder Inhaler has adverse effects such as tremor and palpitations, and it is recommended to use the drug under the guidance of a doctor, rather than blindly using it on your own to avoid serious adverse effects.