EmergingResearch compound

Paraxanthine

Caffeine metabolite nootropic with a lower anxiogenic profile than caffeine.

Telegram

WHAT IS PARAXANTHINE?

Detailed overview

Paraxanthine (1,7-dimethylxanthine) is the primary human metabolite of caffeine, generated by hepatic CYP1A2 demethylation (~84% of a caffeine dose). It is an adenosine A1/A2A receptor antagonist plus phosphodiesterase inhibitor – sharing caffeine`s vigilance-promoting profile but with **lower adenosine A2B affinity**, reducing the anxiogenic side-effect. A 2022 RCT (PMID 35008471) showed 200 mg paraxanthine improved reaction time, sustained attention, and reduced muscular fatigue in healthy adults. The 2021 PK study PMID 33806281 reports higher oral bioavailability and a peak plasma concentration 2-3 hours faster than caffeine. **The ENFINITY brand received FDA-NDI status in 2022** for use as a dietary ingredient.

Mechanism

Adenosine A1/A2A antagonist + PDE inhibitor

Half-life

3-4 h (faster peak than caffeine)

Legal status

Dietary supplement (FDA-NDI 2022)

Safety

Side effects, stop signs, contraindications

Side effects · 7

  • Insomnia or disrupted sleep if dosed too late in the day (stimulant effect)
  • Increased heart rate or palpitations, mild rise in blood pressure
  • Jitteriness or tremor, especially at higher doses
  • Headache, including rebound headache on withdrawal
  • Stomach upset, nausea, increased gastric acid
  • Increased urination (mild diuretic effect)
  • Anxiety, though typically milder than with caffeine

Contraindications · 6

  • Pregnancy and breastfeeding: avoid, as with all methylxanthine stimulants
  • Cardiovascular disease, arrhythmia, uncontrolled hypertension
  • Anxiety disorders, panic disorder: stimulant effect may worsen them
  • Additive effect when combined with other caffeine or stimulant sources
  • CYP1A2-inhibiting drugs (e.g. fluvoxamine, ciprofloxacin) slow its clearance
  • Avoid late-evening dosing due to sleep disruption

Related Nootropics

Same therapeutic category

Telegram

Have a question about Paraxanthine?

Reach out to us on Telegram for a personalized stack. We'll be happy to help.

Telegram
MolekulaX Editorial Team·Source-verified · PubMed · FDA · EMA
Updated: June 19, 2026

The information here is strictly for educational and scientific purposes. It does not replace medical advice or clinical consultation, and it does not encourage illegal substance or pharmaceutical use. Data is sourced. When in doubt, consult your doctor.