Font Size

Medications and Drugs

Brand Names: Talwin Lactate

Generic Name: pentazocine (Pronunciation: pen TAZ oh seen)

What is pentazocine (Talwin Lactate)?

Pentazocine is narcotic pain medication

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

Pentazocine may also be used for other purposes not listed in this medication guide.

What are the possible side effects of pentazocine (Talwin Lactate)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have a serious side effect such as:

  • skin or muscle changes, or a hard lump where the medicine was injected;
  • confusion, hallucinations;
  • feeling like you might pass out;
  • weak or shallow breathing; or
  • increased blood pressure (severe headache, blurred vision, trouble concentrating, chest pain, numbness, seizure).

Less serious side effects may include:

  • mild stinging from the injection;
  • drowsiness, dizziness, headache, ringing in your ears;
  • feeling restless or excited;
  • nausea, vomiting, constipation;
  • sleep problems (insomnia), strange dreams;
  • warmth or redness under your skin;
  • blurred vision;
  • sweating; or
  • mild itching or skin rash.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about pentazocine (Talwin Lactate)?

Do not use this medication if you are allergic to pentazocine.

Before using pentazocine, tell your doctor if you have liver or kidney disease, a history of head injury or brain tumor, heart disease, high blood pressure, recent heart attack, asthma or other breathing disorders, mental illness, or a history of drug or alcohol addiction.

Pentazocine may be habit-forming and should be used only by the person it was prescribed for. Pentazocine should never be shared with another person, especially someone who has a history of drug abuse or addiction. Keep the medication in a secure place where others cannot get to it.

Use this medication exactly as it was prescribed for you. Never use pentazocine in larger amounts, or use it for longer than recommended by your doctor. Tell your doctor if the medicine seems to stop working as well in relieving your pain.

Do not stop using pentazocine suddenly, or you could have unpleasant withdrawal symptoms such as stomach pain, fever, runny nose, watery eyes, anxiety, or restless feeling. Talk to your doctor about how to avoid withdrawal symptoms when stopping the medication.

Avoid drinking alcohol while using pentazocine. Alcohol may increase some of the side effects of pentazocine.

Pentazocine can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert.

Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Pill Identifier Tool

Need help identifying pills and medications?
Use the pill finder tool on RxList.

Medical Dictionary