Before using EpiPen a second time, call your doctor if your first injection caused a side effect such as increased breathing difficulty, or dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, anxiety, confusion, chest pain, shortness of breath, uneven heartbeats, seizure).
Call your doctor at once if you notice pain, swelling, warmth, redness, or other signs of infection around the area where you gave an injection.
Common EpiPen side effects may include:
breathing problems;
fast, irregular, or pounding heartbeats;
pale skin, sweating;
nausea and vomiting;
dizziness;
weakness or tremors;
headache; or
feeling restless, fearful, nervous, anxious, or excited.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 EpiPen side effects (more detail)
