Common Sweating, Headache, Dizziness, Sleepiness, Vomiting, Weakness, Dehydration, Lightheadedness, Nausea, Edema, Dryness in mouth, Fatigue, Anemia, Constipation.

Expert advice for Pentawin Injection
Use Pentawin as instructed by your doctor. Never take in greater amounts or more often than prescribed. It causes sleepiness or drowsiness. If this happens to you, do not drive or use machinery. Avoid consuming alcohol when taking the Pentawin, as it may cause excessive sleepiness or drowsiness. Inform your doctor if you have ever been diagnosed with kidney or liver problems. Store opioid pain relievers in a safe place and out of reach of others.

Q. Is Pentawin a narcotic/ an opiate/ a controlled substance?
Pentawin 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 Pentawin like/ stronger than hydrocodone?
Pentawin 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 Pentawin stay in system?
Pentawin 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.