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How long does an allergic reaction last if I gave Benadryl to my daughter?

An allergic reaction can last several days, even if the suspected allergen is removed. It is important to consult with a pharmacist to ensure you are giving the correct dose of Benadryl based on your child's weight and the concentration of the product. If your child tolerates Benadryl well, you can continue to give it as recommended. Typically, if it is indeed an allergic reaction, there should not be any new symptoms beyond what you have already observed.
How long does an allergic reaction last if I gave Benadryl to my daughter? - Medimap.ca