Let's take a minute to talk about your medication. 
This is Symbicort, an inhaler that contains both budesonide and formoterol. It is a maintenance medication that helps to keep the symptoms of COPD and asthma under control. It works by helping to reduce inflammation in the lungs and by keeping the airway open, making it easier to breath. 
It is often used two times each day, about 12 hours apart. You should use it exactly as your doctor tells you to. After each dose, it is important to rinse your mouth with water, and then spit out the water. This can help to reduce the risk of a common infection called thrush. Before using your inhaler at home, you should demonstrate a dose to your healthcare provider, so you feel confident. You should also read the "Instructions for Use" for full information. If you still have questions, your doctor or pharmacist can help.
Most people tolerate this medicine well. Common side effects include sinus and throat irritation, headache, vomiting, or an upset stomach. Some people have also reported back pain or cold and flu-like symptoms. These are normal if they are mild and should go away. If these or other side effects become reasons you want to stop taking this medicine, please talk with your healthcare team. But don't suddenly stop taking it unless your doctor says it's okay. 
As with any medicine, rare but more serious side effects could occur. With Symbicort, this includes an increased risk of infections and serious breathing issues. Symbicort does not treat sudden symptoms of COPD or asthma. You should always have a rescue inhaler to treat sudden symptoms. Other rare side effects are possible. You should read the "Patient Information Sheet" to know which symptoms to watch for and when to report changes.
Symbicort can interact with other medicines. You should always check with your doctor or pharmacist before taking any other medicines, herbal remedies, or vitamins. 
Women should talk to their doctors before using this medication if they are pregnant or breastfeeding.
For best results, plan ahead for refills, and follow the "Instructions for Use."