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Pentazocine Side Effects

Some people who are using pentazocine may develop side effects, such as headaches, constipation, and nausea. In many cases, reactions to this drug are generally minor and easy to treat. However, serious complications can also occur. Seek medical treatment right away if you experience swelling, fainting, or other potentially serious problems.

An Introduction to Side Effects of Pentazocine

Just like any medicine, pentazocine lactate (Talwin®) can cause side effects. However, not everyone who uses the medication will have problems. In fact, most people tolerate it quite well. If reactions do occur, in most cases, they are minor and either require no treatment or are treated easily by you or your healthcare provider.
 
(This article covers many, but not all, of the possible side effects with pentazocine. Your healthcare provider can discuss a more complete list with you.)
 

Serious Pentazocine Side Effects

Some side effects of pentazocine are potentially serious and should be reported immediately to your healthcare provider. These include but are not limited to:
 
  • The urge to use more pentazocine than prescribed or use it for a nonmedical purpose
  • Swelling, irritation, ulcers, or sloughing of the skin at the injection site
  • High blood pressure (hypertension)
  • Dizziness or fainting
  • A fast heartbeat (tachycardia)
  • Slowed, shallow, or irregular breathing
  • Shortness of breath
  • Feeling confused or disoriented
  • Seeing or hearing things that are not real (hallucinations)
  • Seizures
  • Difficulty urinating
  • Changes in mood or behavior, such as:
 
  • Numbness, burning, pricking, or other unusual sensations of the skin
  • Signs of infection, such as:
 
  • A rash of any kind
  • Signs of an allergic reaction, such as:
    • An unexplained rash
    • Hives
    • Itching
    • Swelling of the mouth or throat
    • Wheezing
    • Difficulty breathing.  
 
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Pentazocine Drug Information

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