A 9-year-old with irritability and multiple seasonal allergies; the suspected cause is which?

A 9-year-old with irritability and multiple seasonal allergies; the suspected cause is which?

• A. Vitamin C
• B. Monosodium gluconate (MSG)
• C. Antihistamines
• D. Ibuprofen

Answer: (C)

Paradoxical reactions to medications can occur in children, especially with certain antihistamines. In kids, first-generation antihistamines (like those commonly used for seasonal allergies) can cross into the brain and sometimes cause CNS stimulation instead of the typical sedation. This can manifest as irritability, restlessness, or agitation rather than calmness. So in a 9-year-old with seasonal allergies who is irritable, the antihistamine they’re taking is a plausible cause because of this potential paradoxical reaction, rather than the allergy itself. If this is suspected, consider reviewing the current antihistamine, and if needed, switch to a second-generation, non-sedating option (e.g., cetirizine or loratadine) and monitor the child’s behavior. Vitamin C, MSG, and ibuprofen don’t typically cause irritability in this context related to seasonal allergies, so they’re less likely explanations for the symptoms here.

Paradoxical reactions to medications can occur in children, especially with certain antihistamines. In kids, first-generation antihistamines (like those commonly used for seasonal allergies) can cross into the brain and sometimes cause CNS stimulation instead of the typical sedation. This can manifest as irritability, restlessness, or agitation rather than calmness.

So in a 9-year-old with seasonal allergies who is irritable, the antihistamine they’re taking is a plausible cause because of this potential paradoxical reaction, rather than the allergy itself. If this is suspected, consider reviewing the current antihistamine, and if needed, switch to a second-generation, non-sedating option (e.g., cetirizine or loratadine) and monitor the child’s behavior.

Vitamin C, MSG, and ibuprofen don’t typically cause irritability in this context related to seasonal allergies, so they’re less likely explanations for the symptoms here.