,
Unfortunately, that is a question that has no general answer. Side effects from any medication, inhalers included, are different for each individual. An inhaler for me might be perfect with no side effects, but for you, can cause problems. And visa-versa. That would be a problem to discuss with your medical team and have them solve that with your input. You might have to try several inhalers before you find one that works for you. Any side effects from any medication needs to be told to your medical team. There could be other causes of back and stomach pain than from COPD inhalers. I have only had one side effect in 4 1/2 years from an inhaler. That was thrush caused by Trelegy. You really need to talk to your medical team. Take care and God Bless!