Pentoxifylline (Trental): Half-Life and Label Dosing
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Pentoxifylline: half-life, strengths and approval status

Tablet strengths · Approval status · Half-life ~0.4 to 0.8 hours (metabolites 1 to 1.6 hours)

Short answer: Pentoxifylline has a half-life of about 0.4 to 0.8 hours (metabolites 1 to 1.6 hours). Levels peak 2 to 4 hours (extended-release tablet) after a dose. People vary, so treat these as estimates.

What is pentoxifylline?

Pentoxifylline is a methylxanthine, from the same family as caffeine and theophylline. The label says it makes blood flow more easily by lowering its thickness (viscosity). It is sold as Trental and as generic 400 mg extended-release tablets for intermittent claudication, the leg pain on walking caused by narrowed leg arteries.

Also known as: Trental.

Tablet strengths

Trental and generic pentoxifylline come as 400 mg extended-release tablets.

Approval status and how it is used

The FDA Trental label approves pentoxifylline for intermittent claudication from chronic blocked arteries in the limbs; it can improve function and symptoms but does not replace surgery or other procedures to open the arteries. The label dose is one 400 mg tablet three times a day with meals. Effects may show within 2 to 4 weeks, and the label recommends at least 8 weeks of treatment. If stomach or nervous system side effects appear, the dose can drop to twice a day; with severe kidney impairment (creatinine clearance below 30 mL/min) it is 400 mg once a day.

It is not used after a recent bleed in the brain or the retina, or by people who could not tolerate it or other methylxanthines such as caffeine, theophylline or theobromine. The label notes bleeding reports with or without blood thinners, anti-platelet drugs or NSAIDs, and says to stop it at the first sign of a severe allergic reaction.

Pentoxifylline half-life and time to peak

  • Half-lifeabout 0.4 to 0.8 hours (metabolites 1 to 1.6 hours)
  • Time to peak (Tmax)2 to 4 hours (extended-release tablet)

The FDA Trental label gives pentoxifylline an apparent plasma half-life of 0.4 to 0.8 hours, and its metabolites 1 to 1.6 hours, after an oral solution. The 400 mg extended-release tablet reaches peak levels in 2 to 4 hours and keeps them steady for an extended time, which is why it is taken three times a day. It does not build up with repeated doses.

Numbers shown are taken from the source above. Half-life varies from person to person.

How to track pentoxifylline in Dose Track

  1. Add pentoxifylline as a custom compound. Start typing its name and Dose Track fills in the details from its research library for you to check, and it sits next to everything else you take.
  2. Log each tablet when you take it, including split or fractional tablets, so your history shows exactly what you took and when.
  3. Set reminders on your own schedule, whether that is daily, weekly or every few days.
  4. Your log is stored on your phone and no account is needed. Data only leaves it for features you choose, like AI answers and lab reading.

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Frequently asked questions

What is the half-life of pentoxifylline?+
The FDA Trental label gives pentoxifylline an apparent plasma half-life of 0.4 to 0.8 hours, and its metabolites 1 to 1.6 hours, after an oral solution. The 400 mg extended-release tablet reaches peak levels in 2 to 4 hours and keeps them steady for an extended time, which is why it is taken three times a day. It does not build up with repeated doses.
How long does pentoxifylline take to work?+
The FDA Trental label says effects may be seen within 2 to 4 weeks, and recommends continuing treatment for at least 8 weeks.
Can I track pentoxifylline in Dose Track?+
Yes. Pentoxifylline is in Dose Track's research library, so when you add it as a custom compound its details are filled in for you to check. You can then log each tablet next to your other compounds, set reminders on your own schedule, and see your history next to your lab results. Your log is stored on your phone and no account is needed. Data only leaves it for features you choose, like AI answers and lab reading.

Sources

  1. Trental (pentoxifylline) extended-release tablets prescribing information (Validus): clinical pharmacology, indications, contraindications, precautions and dosage. DailyMed, October 2026.

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