@joelars I don't think you need a prescription for a salt inhaler since you can easily purchase them on Amazon but you still might want to run it by your doctor to see if their might be any other problems with any treatments or prescriptions you are currently using. Here's some information that may be helpful.

Lung Institute - Salt Therapy and COPD
-- https://lunginstitute.com/blog/salt-therapy-and-copd/