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Common warning signs include: Persistent Lethargy: Feeling weak or tired despite getting adequate sleep

Allergic reactions and severe complications remain rare, though any sign of anaphylaxis requires immediate medical attention

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Expert Q&A Tips Apply a topical anesthetic on the injection site so its less painful when you receive it.Thanks Warnings Contact a doctor or go to the emergency room if you experience nausea, vomiting, facial swelling, loss of vision, or a fever after an injection that shouldnt result in these symptoms.Thanks Always contact your doctor if you have questions about your medications or your post-injection symptoms get worse instead of better.Thanks References About This Article Reader Success Stories "Very helpful and knowledgeable article."