Medically reviewed by Drugs.com. Last updated on Dec 29, 2021.
The Pentoxil brand name has been discontinued in the U.S. If generic versions of this product have been approved by the FDA, there may be generic equivalents available.
Commonly used brand name(s)
In the U.S.
Available Dosage Forms:
- Tablet, Extended Release
Therapeutic Class: Hemorheologic
Chemical Class: Methylxanthine
Uses for Pentoxil
Pentoxifylline improves the flow of blood through blood vessels. It is used to reduce leg pain caused by poor blood circulation. Pentoxifylline makes it possible to walk farther before having to rest because of leg cramps.
Pentoxifylline is available only with your doctor's prescription.
Before using Pentoxil
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 this medicine, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to this medicine 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.
Studies on this medicine have been done only in adult patients, and there is no specific information comparing use of pentoxifylline in children with use in other age groups.
Side effects may be more likely to occur in the elderly, who are usually more sensitive than younger adults to the effects of pentoxifylline.
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 this medicine, 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 this medicine 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 this medicine 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.
- Amtolmetin Guacil
- Choline Salicylate
- Flufenamic Acid
- Ibuprofen Lysine
- Mefenamic Acid
- Niflumic Acid
- Nimesulide Beta Cyclodextrin
- Propionic Acid
- Salicylic Acid
- Sodium Salicylate
- Tiaprofenic Acid
- Tolfenamic Acid
Using this medicine 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. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.
Other medical problems
The presence of other medical problems may affect the use of this medicine. Make sure you tell your doctor if you have any other medical problems, especially:
- Any condition in which there is a risk of bleeding (e.g., recent stroke)—Pentoxifylline may make the condition worse
- Kidney disease or
- Liver disease—The chance of side effects may be increased
Proper use of Pentoxil
This section provides information on the proper use of a number of products that contain pentoxifylline. It may not be specific to Pentoxil. Please read with care.
Swallow the tablet whole. Do not crush, break, or chew it before swallowing.
Pentoxifylline should be taken with meals to lessen the chance of stomach upset. Taking an antacid with the medicine may also help.
The dose of this medicine 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 this medicine. 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 (extended-release tablets):
- For peripheral vascular disease (circulation problems):
- Adults—400 milligrams (mg) two to three times a day, taken with meals.
- Children—Use must be determined by your doctor.
- For peripheral vascular disease (circulation problems):
If you miss a dose of this medicine, 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.
Precautions while using Pentoxil
It may take several weeks for this medicine to work. If you feel that pentoxifylline is not working, do not stop taking it on your own. Instead, check with your doctor.
Smoking tobacco may worsen your condition since nicotine may further narrow your blood vessels. Therefore, it is best to avoid smoking.
Pentoxil 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 as soon as possible if any of the following side effects occur:
- Chest pain
- irregular heartbeat
Signs and symptoms of overdose (in the order in which they may occur)
- unusual excitement
- convulsions (seizures)
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:
- nausea or vomiting
- stomach discomfort
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.
More about Pentoxil (pentoxifylline)
- Side effects
- Drug interactions
- Dosage information
- During pregnancy or Breastfeeding
- Drug images
- Drug class: miscellaneous coagulation modifiers
- Other brands
Related treatment guides
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.