Spiriva is a safe medicine for both asthma and COPD patients. It is an anticholinergic medicine like Atrovent that acts as a bronchodilator, only it's taken once daily and works for up to 24 hours. There have been studies that showing Spiriva actually improved lung function and decreased exacerbations in COPD patients. While Atrovent used to be used as a controller medicine for asthma, Anticholinergics are no longer recommended as a top line medicine for asthma as there are other bronchodilators that work better, such as Albuterol and Serevent and Formeterol.
Usually Spiriva is not the first medicine prescribed to control asthma. However, without knowing the rest of your medical history, and what other medicines you are on or have tried, it's tough for me to form an opinion on your NP (nurse practitioner) ordering Spiriva for your asthma.
As is noted in this post, finding what medicine(s) works best to control your asthma can often be a game of trial and error. Likewise, if you want to find out what your NPs plan of action is for you, ideally you should ask your NP.
If you have further questions please feel free to ask.
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