The rest of it sits in your mouth and throat, therefore, it is very important to rinse
and gargle after each use. The drug which is good in the lungs, is bad in the
mouth and throat. It can cause fungal infections, hoarseness, and temporary loss of voice. You may need to have a throat culture done to make sure you do not have a fungal infection. I am not saying that this is the only possible reason you have problems losing your voice, but I would put it at or close to the top of the list.