Table: Some Causes of Dry Mouth - Merck Manuals Consumer Version

Some Causes of Dry Mouth

Cause	Examples
Drugs
Drugs with anticholinergic effects	Antianxiety drugs Antidepressants Antiemetics Antihistamines Antipsychotics Antispasmodics
Recreational/illegal	Marijuana (cannabis) Methamphetamines Tobacco
Other	Antihypertensive drugs Antiparkinsonian drugs Bronchodilators Chemotherapy drugs Decongestants Diuretics Meperidine, methadone, and other opioids
Systemic disorders
―	Amyloidosis Amyloidosis Amyloidosis is a rare disease in which abnormally folded proteins form amyloid fibrils that accumulate in various tissues and organs, sometimes leading to organ dysfunction, organ failure, and... read more HIV infection Human Immunodeficiency Virus (HIV) Infection Leprosy Leprosy Leprosy is a chronic infection usually caused by the bacteria Mycobacterium leprae or Mycobacterium lepromatosis. It results in damage primarily to the peripheral nerves (the nerves... read more Sarcoidosis Sarcoidosis Sarcoidosis is a disease in which abnormal collections of inflammatory cells (granulomas) form in many organs of the body. Sarcoidosis usually develops in people aged 20 to 40, most often people... read more Sjögren syndrome Sjögren Syndrome Sjögren syndrome is a common autoimmune connective tissue disorder and is characterized by excessive dryness of the eyes, mouth, and other mucous membranes. White blood cells can infiltrate... read more Tuberculosis Tuberculosis (TB) Tuberculosis is a chronic contagious infection caused by the airborne bacteria Mycobacterium tuberculosis. It usually affects the lungs, but almost any organ can be involved. Tuberculosis... read more
Other
―	Daytime or nighttime mouth breathing Head and neck trauma (causing nerve injury) Dehydration Radiation therapy to the head and neck area Viral infections