Pentazocine and naloxone (Oral)
nal-OX-one hye-droe-KLOR-ide, pen-TAZ-oh-seen hye-droe-KLOR-ide
Pentazocine hydrochloride/naloxone hydrochloride is intended for oral use only. Severe, potentially lethal, reactions may result from misuse of pentazocine/naloxone by injection either alone or in combination with other substances .
Medically reviewed on June 7, 2018
Commonly used brand name(s)
In the U.S.
- Talwin NX
Available Dosage Forms:
Therapeutic Class: Analgesic
Pharmacologic Class: Naloxone
Uses For This Medicine
Pentazocine and naloxone combination is used to relieve moderate to severe pain.
Pentazocine belongs to the group of medicines called narcotic analgesics (pain medicines). It acts on the central nervous system (CNS) to relieve pain.
Naloxone is an opioid antagonist. It acts on the CNS to block the effects of narcotics, especially the "high'' feeling that makes you want to use them. It will not produce any narcotic-like effects or cause mental or physical dependence.
When pentazocine is used for a long time, it may become habit-forming, causing mental or physical dependence. However, people who have continuing pain should not let the fear of dependence keep them from using narcotics to relieve their pain. Mental dependence (addiction) is not likely to occur when narcotics are used for this purpose. Physical dependence may lead to withdrawal side effects if treatment is stopped suddenly. However, severe withdrawal side effects can usually be prevented by gradually reducing the dose over a period of time before treatment is stopped completely.
Pentazocine and naloxone is available only with your doctor's prescription.
Before Using This Medicine
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For pentazocine and naloxone, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to pentazocine and naloxone or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Appropriate studies have not been performed on the relationship of age to the effects of pentazocine and naloxone combination in children younger than 12 years of age. Safety and efficacy have not been established.
Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of pentazocine and naloxone combination in the elderly. However, elderly patients are more likely to have age-related liver, kidney, or heart problems, which may require caution and an adjustment in the dose for patients receiving pentazocine and naloxone combination.
|All Trimesters||C||Animal studies have shown an adverse effect and there are no adequate studies in pregnant women OR no animal studies have been conducted and there are no adequate studies in pregnant women.|
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Interactions with Medicines
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking pentazocine and naloxone, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using pentazocine and naloxone with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.
Using pentazocine and naloxone with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
- Chloral Hydrate
- Eslicarbazepine Acetate
- Methylene Blue
- Morphine Sulfate Liposome
- Nitrous Oxide
- Opium Alkaloids
- Sodium Oxybate
- St John's Wort
- Tolonium Chloride
Using pentazocine and naloxone with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Interactions with Food/Tobacco/Alcohol
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using pentazocine and naloxone with any of the following may cause an increased risk of certain side effects but may be unavoidable in some cases. If used together, your doctor may change the dose or how often you use pentazocine and naloxone, or give you special instructions about the use of food, alcohol, or tobacco.
Other Medical Problems
The presence of other medical problems may affect the use of pentazocine and naloxone. Make sure you tell your doctor if you have any other medical problems, especially:
- Addison's disease (adrenal gland problem) or
- Alcohol abuse, or history of or
- Asthma, severe or
- Brain tumor, history of or
- Breathing problems, severe (e.g., hypoxia, hypercapnia) or
- Cholecystitis (inflammation of the gallbladder) or
- Chronic obstructive pulmonary disease (COPD) or
- Cor pulmonale (serious heart condition) or
- Drug dependence, especially with narcotics, or history of or
- Enlarged prostate (BPH, prostatic hypertrophy) or
- Gallbladder disease or gallstones or
- Head injuries, history of or
- Hypothyroidism (an underactive thyroid) or
- Intestinal or bowel blockage or
- Kyphoscoliosis (severe curvature of the spine with breathing problems) or
- Mental illness, history of or
- Pancreatitis (inflammation of the pancreas) or
- Problems with passing urine or
- Respiratory depression (very slow breathing) or
- Stomach or digestive problems (e.g., slow or inflamed bowels)—Use with caution. May increase risk for more serious side effects.
- Heart attack, recent or
- Heart or blood vessel disease or
- Hypertension (high blood pressure) or
- Porphyria (an enzyme problem) or
- Seizures, history of—Use with caution. May make these conditions worse.
- Kidney disease or
- Liver disease—Use with caution. The effects may be increased because of slower removal of the medicine from the body.
Proper Use of This Medicine
Take pentazocine and naloxone only as directed by your doctor. Do not take more of it, do not take it more often, and do not take it for a longer time than your doctor ordered. This is especially important for elderly patients, who may be more sensitive to the effects of pain medicines. If too much of pentazocine and naloxone is taken for a long time, it may become habit-forming (causing mental or physical dependence).
Tell your doctor if you smoke tobacco. Smoking may change how well pentazocine and naloxone works.
The dose of pentazocine and naloxone will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of pentazocine and naloxone. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
- For oral dosage form (tablet):
- For moderate to severe pain:
- Adults, teenagers, and children 12 years of age and older—At first, one tablet every 3 or 4 hours as needed. Your doctor may adjust your dose as needed. However, the dose is usually not more than 12 tablets per day.
- Children younger than 12 years of age—Use and dose must be determined by your doctor.
- For moderate to severe pain:
If you miss a dose of pentazocine and naloxone, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Keep out of the reach of children.
Do not keep outdated medicine or medicine no longer needed.
Ask your healthcare professional how you should dispose of any medicine you do not use.
Make sure you store the medicine in a safe and secure place to prevent others from getting it.
Precautions While Using This Medicine
It is very important that your doctor check the progress of you or your child while you are using pentazocine and naloxone. This will allow your doctor to see if the medicine is working properly and to decide if you or your child should continue to take it.
Pentazocine and naloxone will add to the effects of alcohol and other CNS depressants (medicines that can make you drowsy or less alert). Some examples of CNS depressants are antihistamines or medicine for allergies or colds; sedatives, tranquilizers, or sleeping medicine; other prescription pain medicine or narcotics; medicine for seizures or barbiturates; muscle relaxants; or anesthetics, including some dental anesthetics. Check with your doctor before you or your child take any of the medicines listed above while you are using pentazocine and naloxone.
Pentazocine and naloxone may be habit-forming. If you or your child feel that the medicine is not working as well, do not use more than your prescribed dose. Call your doctor for instructions.
Pentazocine and naloxone may make you dizzy, drowsy, or lightheaded. Make sure you know how you react to pentazocine and naloxone before you drive, use machines, or do anything else that could be dangerous if you are dizzy or not alert.
Using narcotics for a long time can cause severe constipation. To prevent this, your doctor may direct you or your child to take laxatives, drink a lot of fluids, or increase the amount of fiber in your diet. Be sure to follow the directions carefully, because continuing constipation can lead to more serious problems.
If you or your child have been using pentazocine and naloxone regularly for several weeks or longer, do not change your dose or suddenly stop using it without checking with your doctor. Your doctor may want you or your child to gradually reduce the amount you are using before stopping it completely. This may help prevent worsening of your condition and reduce the possibility of withdrawal symptoms, such as abdominal or stomach cramps, anxiety, fever, nausea, runny nose, sweating, tremors, or trouble with sleeping.
Using pentazocine and naloxone while you are pregnant may cause serious unwanted effects in your newborn baby. Tell your doctor right away if you think you are pregnant or if you plan to become pregnant while using pentazocine and naloxone.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.
This Medicine Side Effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
- Black, tarry stools
- chest pain
- cough or hoarseness
- difficult or troubled breathing
- fever with or without chills
- general feeling of tiredness or weakness
- irregular, fast or slow, or shallow breathing
- lower back or side pain
- painful or difficult urination
- pale or blue lips, fingernails, or skin
- 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
- swollen glands
- trembling or shaking of the hands or feet
- unusual bleeding or bruising
- unusual tiredness or weakness
Incidence not known
- Blistering, peeling, or loosening of the skin
- blurred vision
- burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
- decrease in the frequency of urination
- difficulty in passing urine (dribbling)
- difficulty with swallowing
- dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
- fast, slow, pounding, or irregular heartbeat or pulse
- feeling of warmth
- joint or muscle pain
- loss of bladder control
- loss of consciousness
- pounding in the ears
- puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
- rapid breathing
- red skin lesions, often with a purple center
- red, irritated eyes
- redness of the face, neck, arms, and occasionally, upper chest
- skin rash
- swelling of the lower legs or arms
- swelling of the face
- tightness in the chest
- total body jerking
- upper abdominal or stomach pain
- weight gain
Get emergency help immediately if any of the following symptoms of overdose occur:
Symptoms of overdose
- Seeing, hearing, or feeling things that are not there
- seizures (convulsions)
- sleepiness or unusual drowsiness
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- Abdominal or stomach distress
- hives or welts
- redness of the skin
Incidence not known
- Blistering, crusting, irritation, itching, or reddening of the skin
- confusion about identity, place, and time
- constricted, pinpoint, or small pupils (black part of the eye)
- continuing ringing or buzzing or other unexplained noise in the ears
- cracked, dry, or scaly skin
- difficulty in focusing the eyes
- disturbed dreams
- dry mouth
- false or unusual sense of well-being
- hearing loss
- loss of appetite
- mood or mental changes
- relaxed and calm feeling
- trouble with sleeping
- unable to sleep
- weight loss
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
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- Drug class: narcotic analgesic combinations
Other brands: Talwin Nx