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Pentazocine is used for pain

How it works

Pentazocine decreases the perception of pain by blocking the transmission of pain signals to the brain.

Common side effects

Nausea, Palpitations, Altered vision, Headache, Decreased breathing rate, Changes in contractions during labor, Confusion, Constriction of pupil, Convulsion, Decreased body temperature, Decreased libido, Disorientation (alteration of mental status), Dizziness, Drowsiness, Sleepiness, Eye pain, Facial flushing, Fainting, Hallucination, Increased sweating, Insomnia, Lightheadedness, Extremes of being happy or sad, Depression, Mood changes, Rash, Itching, Nightmare, Heart rate irregular

Available Medicine

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Expert advice

Swallow the tablets with water, after mealsBefore you take Pentazocine, tell your doctor:
  • If you have severe liver or kidney problems.
  • If you have diseased adrenal glands such as addison’s disease.
  • If you have inflammatory or obstructive bowel disease.
  • If you have an enlarged prostate gland and have difficulty urinating and are male.
  • If you have an underactive thyroid gland.
  • If you recently had a heart attack.
  • If you have suffered from drug abuse or dependence.
  • if you have intolerance to some sugars.
  • If you are taking or have recently taken any prescription or other OTC medicines, especially: monoamine oxidase inhibitors (MAOIs, e.g. moclobemide), phenothiazines (eg chlorpromazine), doxapram, ethyl alcohol.
Pentazocine tablets may cause sedation especially if taken with alcohol. Make sure you are not affected before you drive or operate machinery. Taking a pentazocine for headaches too often or for too long can make them worse.

Frequently asked questions


Q. Is pentazocine a narcotic/ an opiate/ a controlled substance?
Pentazocine is a narcotic opioid analgesic. It is a controlled substance

Q. Is pentazocine naloxone an opiate/ a narcotic?
Pentazocine naloxone contains 2 medications, pentazocine and naloxone. Pentazocine is a narcotic pain reliever (opiate-type). Naloxone counteracts the effect of opiate active ingredient in it and helps to prevent misuse of this product

Q. Is pentazocine like/ stronger than hydrocodone?
Pentazocine and hydrocodone belong to same category of drugs and are equally effective and safe in treatment of moderate to severe pain, Always follow doctor's advice regarding its use

Q. Does pentazocine have codeine in it?
No, it doesn't contain codeine. It is a narcotic opioid analgesic

Q. How long does pentazocine stay in system?
Pentazocine is absorbed from the gastro-intestinal tract; following administration by mouth, peak plasma concentrations are reached in 1-3 hours and the half-life is reported to be 2-3 hours, but it can be detected in urine from 1-3 days.

Content on this page was last updated on 02 January, 2017, by Dr. Varun Gupta (MD Pharmacology)