Alternatives to Diphenhydramine for Older Adults
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Guidance summarizing safer antihistamine alternatives to oral diphenhydramine in adults aged 65+ and advising clinicians on preferred agents on the Medi‑Cal Rx contract list; intended for prescribers and pharmacists serving Central California Alliance for Health members.
No material clinical or coverage changes in this revision.
Recommended Alternatives & Use Guidance
Alternatives
Preferred alternatives to oral diphenhydramine for older adults
Table 1 lists selected antihistamines available on the Medi-Cal Rx Contract Drugs List.
For current information on covered products, check the Medi‑Cal Rx Contract Drugs List on the Medi‑Cal Rx Web Portal.
Diphenhydramine may be appropriate for the acute treatment of severe allergic reaction. The source guidance explicitly notes that while long‑term use is discouraged in older adults, short‑term use for an acute, severe allergic event can be appropriate and is not categorically excluded.
Per the 2023 American Geriatrics Society (AGS) Beers Criteria, use of first‑generation oral antihistamines (including diphenhydramine) is recommended to be avoided in adults aged 65 years or older. The document therefore discourages routine, long‑term use of diphenhydramine for older adults because of the risks associated with these agents.
Authorization, Coverage Lookup, and Documentation Notes
Prior authorization not specified; check Medi‑Cal Rx list
This guidance does not impose any prior authorization requirements for antihistamines; clinicians should refer to the Medi‑Cal Rx Contract Drugs List for which products are covered.
No step therapy requirements described
The policy does not describe any step therapy requirements for older adults being treated with antihistamines.
Verify coverage on Medi‑Cal Rx Contract Drugs List
Check the Medi‑Cal Rx Contract Drugs List on the Medi‑Cal Rx Web Portal for current information on which second‑generation antihistamines are covered.
- Table 1 lists selected antihistamines (cetirizine, desloratadine, fexofenadine, levocetirizine, loratadine) available on the Medi‑Cal Rx Contract Drugs List.
- The Medi‑Cal Rx Contract Drugs List page on the Medi‑Cal Rx Web Portal contains up‑to‑date coverage information.
No authorization or denial triggers specified
The document does not specify any explicit authorization or denial triggers for antihistamine coverage decisions.
Clinical Rationale
Diphenhydramine is a first‑generation antihistamine with strong anticholinergic effects and reduced clearance in older adults. These pharmacologic properties increase the risk of adverse anticholinergic outcomes with long‑term use, including confusion, dry mouth, constipation, development of tolerance, and other anticholinergic toxicity. Clinicians should weigh these risks when considering diphenhydramine for patients aged 65 years or older.
Key Terms
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