Hello @sadiecora,

I've never used this med for drooling. So far, I've found that chewing gum works pretty well when I'm having a drooling episode. Here is some information regarding this med from Mayo's website:
https://www.mayoclinic.org/drugs-supplements/glycopyrrolate-oral-route/proper-use/drg-20074451?p=1
Here is another link to information from the National Institutes of Health website,
https://www.ncbi.nlm.nih.gov/books/NBK526035/
Did your husband have tremors before taking this med? Has your husband considered talking with his doctor about taking a lesser dose to see if that would reduce the tremors? It might be worth a call to the doctor's office to see if this would be a possibility.