Expectorant for pet rat

I need an expectorant for my pet rat. I am looking for as natural a medication as possible.

This is not a chat site. We have pet experts here. You just need to wait for them to come online.

As far as I know, there is no such thing.

A Vet is your best source of info. If that fails, a pet store.

Why does the rat need an expectorant? What are his/her symptoms?