You're smart to consider the ramifications of stopping a medication like trazodone.
In general, I always urge people to consult their doctor before they discontinue taking any medication. Your doctor might be able to answer your question about the dry mouth issue without your going through the hassle of stopping a valuable medication.
If you decide to stop the tramadol anyway, then your physician can tell you the best way to do it. You certainly do not want to abruptly stop taking it. You also can consult a pharmacist for more information on this.
It's worth noting trazodone is an antidepressant medication, not a pain
medication. Trazodone is often prescribed for sleep problems, even
though it is not a "sleep aid," per se. If back pain is causing you to
have sleep problems, then it might be worthwhile to explore treating the cause of the pain instead of treating the insomnia.
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