Pentazocine is an opioid pain medication. An opioid is sometimes called a narcotic.

Pentazocine is used to treat moderate to severe pain. It is also used as part of anesthesia for surgery.

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  • Talwin Lactate, Talwin
  • Rare
    Black, tarry stools
    blistering, peeling, or loosening of the skin
    chest pain
    chills
    cough
    diarrhea
    fast, pounding, or irregular heartbeat or pulse
    fever
    itching
    joint or muscle pain
    painful or difficult urination
    red, irritated eyes
    red skin lesions, often with a purple center
    shakiness in the legs, arms, hands, or feet
    shortness of breath
    sore throat
    sores, ulcers, or white spots on the lips or in the mouth
    swelling or puffiness of the face
    swollen glands
    trembling or shaking of the hands or feet
    unusual bleeding or bruising
    unusual tiredness or weakness
    Incidence not known
    Blistering, crusting, irritation, itching, or reddening of the skin
    blue-green to black skin discoloration
    bluish lips or skin
    blurred vision
    burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
    cold, clammy skin
    confusion
    cough
    cracked, dry, or scaly skin
    decrease in frequency of urination
    decrease in urine volume
    depression
    difficult or troubled breathing
    difficulty in passing urine (dribbling)
    dizziness
    fainting
    fast or slow heartbeat
    fast, weak pulse
    flushed skin
    hardening or thickening of the skin
    headache
    increased sweating
    irregular, fast, slow, or shallow breathing
    lightheadedness
    nervousness
    pain, redness, or sloughing of the skin at the injection site
    pale or blue lips, fingernails, or skin
    pounding in the ears
    rapid breathing
    small lumps under the skin at the injection site
    stinging at the injection site
    sweating
    swelling of the lower legs or arms
    tightness in the chest
    very slow breathing
    weight gain
    wheezing
    Some pentazocine side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them:

    More common
    False or unusual sense of well-being
    nausea
    vomiting
    Rare
    Change in taste
    confusion about identity, place, and time
    constricted, pinpoint, or small pupils (black part of the eye)
    double vision
    seeing double seeing, hearing, or feeling things that are not there
    sleeplessness
    stomach cramps
    trouble sleeping
    unable to sleep uncontrolled eye movements
    Incidence not known
    Continuing ringing or buzzing or other unexplained noise in the ears
    difficulty having a bowel movement (stool)
    difficulty in focusing the eyes
    disturbed dreams
    drowsiness
    dry mouth
    excitement
    hearing loss
    irritability
    relaxed and calm
    sleepiness
    sleeplessness
    trouble sleeping
    unable to sleep
    weakness
  • (injectable solution)