▪Drug ClassAllergy; Antihistamine, 1st-generation ▪IndicationsAllergic rhinitis, anaphylaxis ▪MechanismAntagonizes cholinergic (H1) receptors ▪Dosage with Qualifiers Allergic rhinitis—4mg PO q4-6h Anaphylaxis—5-20mg SC/IM q6-12h prn