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. Author manuscript; available in PMC: 2018 Feb 1.
Published in final edited form as: Clin Geriatr Med. 2017 Feb;33(1):87–103. doi: 10.1016/j.cger.2016.08.007

  • Medications, including anti-depressants, anti-cholinergics, anti-spasmodics, anti-hypertensives, antihistamines, sedatives and diuretics

  • Sjögren syndrome

  • Diabetes mellitus

  • Head and neck irradiation

  • Dehydration

  • Parkinson's disease