Pam,

Is vicodin the only pain med your husband is taking???
There are so many other wonderful pain meds that work better than vicodin. You might want to see about getting something stronger for him and perhaps liquid so you can put it through his peg tube easier.
If he is having lots of thick secretions you can try Robitussin which has guiafenesin to help thin the secretions.

Hope each day gets better for him.

Michelle