1. Asthma: It may be used to treat asthma, a condition in which the airways become inflamed and narrow, making it difficult to breathe.

2. Chronic obstructive pulmonary disease (COPD): It may be used to treat COPD, a group of lung diseases that includes chronic bronchitis and emphysema, both of which cause difficulty breathing.

3. Bronchitis: It may be used to treat acute and chronic bronchitis, which are respiratory conditions characterized by inflammation of the bronchial tubes.

4. Emphysema: It may be used to treat emphysema, a condition in which the air sacs in the lungs are damaged, making it difficult to breathe.

It's important to note that It can have potential side effects, including nausea, vomiting, headache, insomnia, and palpitations. Additionally, these medications can interact with other medications and should only be taken under the guidance of a healthcare provider, who can help determine if they are appropriate for a particular condition and can monitor for any potential side effects or interactions.