Doxepin Oral Rinse

Doxepin Oral Rinse (Swish & Spit)

Class: Tricyclic antidepressant (TCA) – topical use in oral cavity.

Mechanism of Action (Topical)

  • Blocks histamine H1 and H2 receptors and adrenergic/nociceptive pathways, providing local analgesic and antipruritic effects.
  • Reduces pain from oral mucositis or ulceration in cancer patients undergoing chemotherapy or radiation therapy.

Indications in Oncology

  • Painful oral mucositis from:
  • Off-label use for oral pain management in palliative care when systemic analgesics are insufficient or to avoid systemic side effects.

Formulation / Administration

  • Oral rinse (swish and spit), compounded in concentrations such as 5 mg/mL (varies by institution).
  • Typical dose: 5–10 mL, swish in mouth for 30–60 seconds, then spit out, up to 4 times daily.
  • Do not swallow (minimal systemic absorption).

Adverse Effects (Topical)

  • Local: bitter taste, drowsiness if swallowed, transient oral numbness
  • Rare systemic effects if swallowed: anticholinergic effects (dry mouth, sedation, constipation)

Pharmacist Pearls

  • Often used short-term for severe mucositis pain.
  • Educate patients: swish and spit, avoid swallowing to minimize systemic TCA effects.
  • Can be combined with other supportive measures: saline/baking soda rinses, topical lidocaine, coating agents.
  • Monitor for sedation if patient inadvertently swallows significant amounts.
  • Useful in palliative care for rapid, localized pain relief.

Summary:

  • Doxepin swish = topical TCA rinse for oral mucositis pain.
  • Provides local analgesia with minimal systemic effects.
  • Requires patient counseling on proper swish-and-spit technique.
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