What do we mean by Dry mouth

Dry mouth is a common side effect of many prescription and nonprescription drugs, including drugs used to treat depression, anxiety, pain, allergies, and colds, obesity, acne, epilepsy, hypertension, diarrhea, nausea, psychotic disorders, urinary incontinence, asthma, and Parkinson's disease. Dry mouth can also be a side effect of muscle relaxants and sedatives.
We all need saliva to moisten and cleanse our mouths and digest food. Saliva also prevents infection by controlling bacteria and fungi in the mouth.
When you don't make enough saliva, your mouth gets dry and uncomfortable. Many treatments can help against dry mouth, also called xerostomia.
Dry mouth can be a side effect of medical conditions, including Sjögren's syndrome, Alzheimer's disease, diabetes, anemia, cystic fibrosis, rheumatoid arthritis, hypertension, Parkinson's disease, stroke, and mumps.