Clinical decision-support only. For use by licensed dental professionals. Not a substitute for professional judgment or a complete drug reference. Always verify with primary sources.
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Medication

Hyoscyamine

GI antispasmodic (anticholinergic)

Brand names: Levsin

Oral health effects

  • Xerostomia

    Potent anticholinergic; dry mouth is common. Also used to reduce secretions before some procedures.

    Mechanism: Muscarinic receptor blockade.

    Clinical management: Hydration and caries prevention.

  • Loss of taste

    Loss of taste is a listed adverse reaction of hyoscyamine. Frequency not stated. It often occurs alongside anticholinergic dry mouth.

    Clinical management: Ask about taste changes. Manage dry mouth with saliva substitutes and sugar-free xylitol products, and discourage sugary snacks used to compensate for reduced taste.

Sources

  1. A Guide to Medications Inducing Salivary Gland Dysfunction, Xerostomia, and Subjective Sialorrhea: A Systematic Review Sponsored by the World Workshop on Oral Medicine VI. Wolff A, Joshi RK, Ekström J, et al. Drugs in R&D, 2017.
  2. Hyoscyamine sulfate prescribing information (FDA label) Redpharm Drug / DailyMed, 2026.