What side effects may I notice from receiving Naloxone Hydrochloride, Pentazocine Hydrochloride?

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

-allergic reactions (skin rash, itching or hives; swelling of the face, lips, or tongue)
-confusion
-kidney injury (trouble passing urine or change in the amount of urine)
-low adrenal gland function (nausea; vomiting; loss of appetite; unusually weak or tired; dizziness; low blood pressure)
-low blood pressure (dizziness; feeling faint or lightheaded, falls; unusually weak or tired)
-serotonin syndrome (irritable; confusion; diarrhea; fast or irregular heartbeat; muscle twitching; stiff muscles; trouble walking; sweating; high fever; seizures; chills; vomiting)
-trouble breathing
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-constipation
-dry mouth
-headache
-nausea, vomiting
-tiredness

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