Dry mouth symptoms can be side effect of certain medications for older adults. For older adults, dry mouth can be a common side effect of prescribed medications. However, there's much we don't understand about the connection between medications and dry mouth in older adults. Recently, researchers examined 52 related studies to learn more. Source 7w.
There are many causes of dry mouth, and side effects for medicine are just one. I myself have had dry mouth to the point of being unable to open my mouth, due to environmental conditions. I do not currently nor recently take medicine for any condition or illness.