@gillytrue - I'll let @ailsas chime in, too, but I personally took guaifenesin pills all through graduate school, prescribed by my primary care doctor locally, to stifle my coughing. No one knew at that time that my coughing was due to asthma, but it worked well enough to deal with that symptom.

Here is some Mayo Clinic information on this medication:

- Guaifenesin (oral route) https://www.mayoclinic.org/drugs-supplements/guaifenesin-oral-route/description/drg-20068720