For a mild allergic reaction, which medication is appropriate?

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A mild allergic reaction is driven largely by histamine causing itching, hives, and nasal symptoms. An antihistamine that blocks H1 receptors, such as diphenhydramine, is well suited to counter these effects. It helps relieve itching and hives and reduces runny nose or sneezing, making it a practical first-line option for mild reactions.

Epinephrine is reserved for more severe reactions with airway swelling, wheezing, or shock; using it for a mild reaction isn’t appropriate because it has powerful cardiovascular effects and is unnecessary in this context. An albuterol inhaler targets bronchospasm; if there’s no breathing difficulty or wheeze, it isn’t the primary treatment for a mild reaction. Acetaminophen doesn’t address histamine-driven symptoms like itching or hives at all. So the antihistamine best fits the needs of a mild allergic reaction.