Theobromine
The main methylxanthine in cocoa: a mild, long-lasting stimulant with less jitter than caffeine.
Pharmacology
Contents
WHAT IS THEOBROMINE?
Detailed overview
Theobromine (3,7-dimethylxanthine) is the primary methylxanthine alkaloid of the cocoa bean and also one of caffeine's human metabolites. It acts as an adenosine receptor antagonist and a weak phosphodiesterase inhibitor, but it binds adenosine receptors far more weakly than caffeine, so its stimulation is milder, longer-lasting and typically comes with less jitteriness or anxiety. It also relaxes vascular smooth muscle, is mildly diuretic, and peripherally suppresses cough by inhibiting sensory nerve activation. In double-blind randomized human trials, theobromine measurably affected mood, psychomotor performance and blood pressure, contributing to the pleasant, gentle stimulation of the cocoa experience.
Mechanism
Adenosine antagonist + weak PDE inhibitor
Half-life
Roughly 6 to 10 hours (longer than caffeine)
Legal status
Cocoa-derived, freely consumed
Receptor profile
- Adenosine receptors (A1/A2A)Moderate
- Phosphodiesterase enzymesWeak
- Vascular smooth muscle (vasodilation)Moderate
- Bronchial smooth muscle / sensory nervesModerate
Safety
Side effects, stop signs, contraindications
Side effects · 5
- Insomnia or disrupted sleep if dosed late, since its half-life is longer than caffeine's
- Mild increase in heart rate and small blood pressure changes (vasodilatory effect)
- Increased urination due to a mild diuretic effect
- Headache, nausea or restlessness at high doses
- Highly toxic to dogs and cats, which metabolize it slowly, so it must never be left accessible to pets
Contraindications · 5
- Pregnancy and breastfeeding: moderation advised, as with all methylxanthines
- Cardiovascular disease, arrhythmia or uncontrolled hypertension
- Additive stimulant load when combined with other caffeine or methylxanthine sources
- Reflux or excess gastric acid: methylxanthines may aggravate symptoms
- Household caution: cocoa-containing products are dangerous to pets because of theobromine
Related Nootropics
Same therapeutic category
Studies
Related research and clinical findings
Differential contributions of theobromine and caffeine on mood, psychomotor performance and blood pressure
Mitchell ES, Slettenaar M, vd Meer N, Transler C, Jans L, Quadt F, Berry M
Psychopharmacology of theobromine in healthy volunteers
Baggott MJ, Childs E, Hart AB, de Bruin E, Palmer AA, Wilkinson JE, de Wit H
Theobromine inhibits sensory nerve activation and cough
Usmani OS, Belvisi MG, Patel HJ, Crispino N, Birrell MA, Korbonits M, Korbonits D, Barnes PJ
Theobromine supplementation in combination with a low-calorie diet improves cardiovascular risk factors in overweight and obese subjects with metabolic syndrome: a randomized controlled trial
Jang HH, et al.
Discriminative stimulus and subjective effects of theobromine and caffeine in humans
Mumford GK, Evans SM, Kaminski BJ, Preston KL, Sannerud CA, Silverman K, Griffiths RR
Reinforcing effects of caffeine and theobromine as found in chocolate
Smit HJ, Blackburn RJ
FAQ
FAQ
The main methylxanthine in cocoa: a mild, long-lasting stimulant with less jitter than caffeine.
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Structure & chemistry
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.