What are the side effects of Humulin R?

The most common side effects of Humulin R are redness, swelling, itching, and mild pain at the site of injection. More severe side effects include:

  • changes in vision, chills, confusion, dizziness, drowsiness, fainting, fast or uneven 
  • heartbeat, headache, mood changes, seizures, slurred speech, swelling, tremor, 
  • difficulty breathing, difficulty concentrating, increased appetite, sweating, or weakness.

If you have any of these symptoms or begin having an allergic reaction, get emergency medical attention.

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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.