Sue @sueinmn I have started used BING AI (artificial inteligence) instead of GOOGLE, a much better search engine on medical stuff. Anyway I found this info on using Mucinex and NAC for bronchiectasis.

Mucinex and NAC are both mucus-thinning medications (known as mucolytics) that can help people with bronchiectasis clear their airways and reduce the risk of infections and exacerbations.
Mucinex is the brand name of guaifenesin, an oral expectorant that loosens and thins mucus in the lungs. It is available over-the-counter and should not be combined with dextromethorphan, a cough suppressant1.
NAC stands for N-acetylcysteine, a mucus-dissolving and anti-inflammatory agent that can be taken orally or inhaled using a nebulizer. It is usually prescribed by a doctor and may have additional benefits such as antioxidant and anti-bacterial effects23.
A randomized trial in China showed that NAC reduced the frequency of acute worsening episodes (exacerbations) and improved the quality of life of patients with bronchiectasis compared to as-needed therapy2.
Both Mucinex and NAC can be used as part of a bronchial hygiene routine that may also include other medicines such as saline solutions, albuterol, or mannitol, as well as non-medical therapies such as hydration, exercise, and chest physiotherapy13.
The best choice of medication for bronchiectasis depends on the individual’s condition, symptoms, preferences, and doctor’s advice. Some people may benefit from using both Mucinex and NAC, while others may find one more effective than the other. poodledoc