The New York Times states that “a frequent side effect of many commonly prescribed drugs” is xerostomia, according to a 2015 review of research on treating xerostomia published in the journal Therapeutics and Clinical Risk Management. The New York Times states many “common culprits in xerostomia,” include benzodiazepine, antidepressants, some oral drugs used to reduce blood sugar, respiratory agents, quinine, some drugs used to treat high blood pressure, drugs used to treat excess urination, some nonsteroidal anti-inflammatory drugs, opioids, glucosamine supplements, and magnesium hydroxide. “Not all the drying mechanisms of the various drugs involved are fully understood,” the article states. “Some of them are known to suppress the action of receptors on nerve cells in various glands, including the salivary glands, that produce fluids.”
The Oral Health Topics on ADA.org provides additional information on xerostomia for dental professionals.