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What are side effects of allergy shots?

Donna Hill Howes, RN
Family Practitioner

Side effects may include redness, warmth, or swelling at the injection site. These are common. Less than 1% of people have a more severe, systemic reaction. This may include a drop in blood pressure, sudden closure of airways in the lungs (bronchospasm), or a life-threatening allergic reaction. Any severe reaction will almost always occur within 30 minutes after an injection. Your doctor will ask you to wait 30 minutes before leaving the clinic. 

This answer was adapted from Sharecare's award-winning AskMD app. Start a consultation now to find out what's causing your symptoms, learn how to manage a condition, or find a doctor. 

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.