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Allergic Reactions in Children – Q&A with Dr. Jessica George

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By Tribeca Pediatrics,  October 10, 2024
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Allergies

Allergic reactions in children can range from mild skin irritations to severe, life-threatening emergencies. In this Q&A, Dr. Jessica George answers some of the most frequently asked questions from our families about allergies, offering clear guidance on how to recognize, manage, and treat allergic reactions.

Dr. George discusses the most common signs of allergic reactions, from mild to severe, when to seek medical care, and the best approaches to managing allergies, including the use of antihistamines like Zyrtec and Benadryl.

What are the most common signs of an allergic reaction in children?
Allergic reactions can affect the skin, breathing, gastrointestinal (GI) system, or circulation. Symptoms are triggered by histamine release, often due to allergens like food, medications, or bee stings. Reactions may present with hives, difficulty breathing, vomiting, or other symptoms.

What are the differences between mild, moderate, and severe reactions?
Mild to moderate allergic reactions typically involve hives, which may look like itchy mosquito bites, or isolated vomiting. These are often seen in food allergies and affect the skin or GI system.

Severe reactions, or anaphylaxis, occur when two or more body systems are affected. For example, a child might have hives and wheezing, or hives and vomiting. Symptoms like becoming pale or having difficulty breathing are signs of a severe reaction that require immediate attention.

What’s the best course of action if a child starts experiencing symptoms of a severe allergic reaction, like difficulty breathing or swelling?
Severe reactions that involve more than one body system—like hives and difficulty breathing or vomiting—require immediate medical attention. If your child is experiencing severe symptoms, go straight to the ER or administer an epinephrine injection (EpiPen) if available. Following administration of an EpiPen, always seek emergency medical care.

How quickly should I expect an allergic reaction to appear after exposure to an allergen?
Reactions usually appear within minutes to a few hours after exposure, and rarely more than 24 hours later.

Are there certain allergens that cause faster or slower reactions?
No, the timing is generally similar across allergens, whether it’s food, medication, or an insect sting.

When should parents consider using an over-the-counter antihistamine like Zyrtec or Benadryl for allergies?
Antihistamines should be used if your child develops hives or itching. Zyrtec (cetirizine) and Benadryl (diphenhydramine) are both effective in treating allergic reactions, but we no longer recommend Benadryl as the first line of defense. Benadryl can cause drowsiness, dry out the nose and mouth, increase seizure risk, and affect brain function—especially in elderly people, where it can worsen dementia.
Zyrtec, on the other hand, is a newer, “cleaner” antihistamine that is just as effective without these side effects. Zyrtec is the preferred choice, along with Claritin (loratadine), which belongs to the same class of antihistamines.

Are there specific allergic reactions where Zyrtec or Benadryl wouldn’t be effective?
Antihistamines won’t stop the progression of anaphylaxis or life-threatening allergic reactions. For food allergies or severe reactions like insect stings, always have an emergency action plan, including access to an EpiPen.

What are the most common food allergies in children?
Peanut, egg, and tree nut allergies are among the most common. However, immediate severe reactions are rare, so parents shouldn’t avoid giving these foods unless a reaction has been documented.

Is it safe to use Zyrtec or Benadryl for long-term allergy management in kids? Are there any side effects parents should be aware of?
Zyrtec is generally safe for long-term use in children with allergies. Parents should always follow dosage instructions and consult with their pediatrician for ongoing allergy management.

Daily medications are not necessary for food allergies but can be useful for severe seasonal allergies. Zyrtec can be given regularly during high-allergen seasons.

Zyrtec is safer and recommended over Benadryl due to its lack of sedation and other negative effects on the brain and body, making it a better option for long-term allergy management in children.

Can antihistamines like Zyrtec or Benadryl be used alongside other medications? Are there any medications that parents should avoid combining with these antihistamines?
Zyrtec generally has no significant interactions with other medications. Benadryl on the other hand, being a sedating antihistamine, can increase drowsiness when combined with other sedatives, such as certain pain relievers (e.g., opioids), sleep aids, or anxiety medications (e.g., benzodiazepines). While this combination doesn’t pose a severe risk, it may amplify the sedative effect, making your child more drowsy than expected. It’s always a good idea to consult your pediatrician when introducing new medications or if you have concerns about combining treatments.

What are the best preventive measures for children with known allergies, especially during high-allergen seasons?
The most effective prevention is strict avoidance of known allergens. For example, if your child has a food allergy, ensure the school and caregivers are aware and have the appropriate paperwork on file, including allergy medication administration forms. In severe cases of airborne allergies, exposure therapies might be considered.

For parents who don’t know if their child has allergies, what are the first steps in identifying and managing them?
Watch for symptoms when introducing new foods or medications. Mild reactions warrant a call to your pediatrician, while severe reactions need immediate medical attention. If necessary, we can refer you to an allergist to develop an allergy management plan.

Should they see an allergist, and what tests can help determine specific allergies?
Allergy testing is most appropriate to confirm an allergy after a suspected reaction. However, it’s important to note that allergy testing is not a general screening tool, as it can result in false positives and lead to unnecessary food restrictions.

Key Takeaways:

  • Learn the signs of allergic reactions and know when to seek help.
  • Zyrtec is generally safer and more effective for long-term use over Benadryl.
  • Keep your child’s school informed of any known allergies, and have paperwork on file.
  • Allergy testing should only be done to confirm suspected reactions, not as a routine screen.
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