What side effects may I notice from receiving Naloxone Hydrochloride?

Side effects that you should report to your doctor or health care professional as soon as possible:

-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-breathing problems
-fast, irregular heartbeat
-high blood pressure
-pain that was controlled by narcotic pain medicine
-seizures

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-anxious
-chills
-diarrhea
-fever
-nausea, vomiting
-sweating

This list may not describe all possible side effects for Naloxone Hydrochloride. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.