From Malaria to Mitochondria: The 150-Year Scientific History of Methylene Blue
Short answer: Methylene blue was first synthesized in 1876 as a textile dye by German chemist Heinrich Caro. Within 15 years it became the first fully synthetic drug used to treat a human disease, when Paul Guttmann and Paul Ehrlich used it against malaria in 1891. Since then it has been used as a biological stain, an antidote, a psychiatric research compound, and the chemical ancestor of modern antipsychotics. Today it is FDA approved for methemoglobinemia and widely studied for its effects on mitochondria and the brain.
Methylene blue timeline
|
Year |
Milestone |
|
2016 |
FDA approves ProvayBlue, a pharmaceutical methylene blue injection, for acquired methemoglobinemia |
|
2016 |
Randomized fMRI study in Radiology links a single dose to improved memory retrieval in healthy adults |
|
2000s |
Researchers study methylene blue for mitochondrial support, neuroprotection, and tau aggregation in Alzheimer's disease |
|
1980s |
Clinical studies test methylene blue in bipolar disorder |
|
1950s |
Chlorpromazine, built on the phenothiazine core methylene blue shares, launches the modern antipsychotic era |
|
1930s |
Physicians begin using methylene blue to treat methemoglobinemia and certain poisonings |
|
1899 |
Italian physician Pietro Bodoni reports using methylene blue in psychiatric patients |
|
1891 |
Guttmann and Ehrlich treat two malaria patients, the first use of a synthetic drug against a specific disease |
|
1880s |
Robert Koch and Paul Ehrlich use methylene blue to stain bacteria and nerve tissue |
|
1876 |
Heinrich Caro synthesizes methylene blue at BASF as a cotton dye |
How did a textile dye become a medicine?
In the late 1800s, German chemists were producing synthetic dyes from coal tar. Scientists noticed that some dyes stained certain cells and microbes but not others. Paul Ehrlich reasoned that if a dye could selectively bind a pathogen, it might also selectively harm it.
Methylene blue stained malaria parasites strongly. In 1891, Guttmann and Ehrlich gave it to two patients with malaria, and both recovered. That result helped launch Ehrlich's "magic bullet" concept, the foundation of modern chemotherapy and targeted drug design.
Why did methylene blue fall out of use for malaria?
Methylene blue was used against malaria into the early 20th century, including by soldiers in the field. It was eventually replaced by drugs such as chloroquine, which were more effective. Soldiers also disliked a harmless but noticeable side effect: it turned their urine blue-green and could tint the whites of their eyes. Interest in methylene blue for malaria has since returned, as researchers study it in combination therapies against drug-resistant strains.
How is methylene blue connected to psychiatric drugs?
Methylene blue belongs to the phenothiazine chemical family. In the 1940s and 1950s, chemists modifying phenothiazine structures created chlorpromazine, the first widely used antipsychotic. Related work contributed to early antihistamines and tricyclic antidepressants. Methylene blue is effectively the chemical grandparent of these drug classes.
Methylene blue itself was tested in psychiatric patients as early as 1899, and in the 1980s researchers studied it for bipolar disorder. A 2017 randomized trial in the British Journal of Psychiatry found it reduced residual depression and anxiety symptoms when added to standard bipolar treatment.
What is methylene blue's main medical use today?
Its primary approved use is treating methemoglobinemia, a condition in which hemoglobin is oxidized and cannot carry oxygen. Given intravenously, methylene blue converts methemoglobin back to working hemoglobin. In 2016, the FDA approved ProvayBlue for this purpose. Methylene blue is also on the World Health Organization's Model List of Essential Medicines as an antidote.
Hospitals also use it as a surgical dye, in certain types of shock where blood pressure will not respond to standard drugs, and in diagnostic procedures.
Why is methylene blue now studied for the brain?
In the late 20th and early 21st centuries, researchers discovered that methylene blue can act as an alternative electron carrier in mitochondria. It accepts electrons from NADH and passes them to cytochrome c, supporting energy production when parts of the electron transport chain are impaired.
This finding moved methylene blue into neuroscience. Labs such as Francisco Gonzalez-Lima's at the University of Texas at Austin showed low-dose methylene blue improved memory and brain metabolism in rodents. In 2016, a randomized human fMRI trial found improved memory retrieval after a single dose. Separately, a methylene blue derivative was tested in large Alzheimer's trials, which did not meet their primary goals.
What does the next chapter look like?
Current research areas include mitochondrial disorders, neuroprotection after stroke or injury, combination therapy for drug-resistant malaria, photodynamic therapy, and cognitive aging. Methylene blue has become popular in the biohacking and longevity communities, though most of its brain-related uses remain investigational.
FAQ
When was methylene blue discovered?
It was first synthesized in 1876 by Heinrich Caro at BASF in Germany.
Was methylene blue the first synthetic drug?
It is widely credited as the first fully synthetic compound used to treat a specific disease in humans, after Guttmann and Ehrlich used it for malaria in 1891.
Is methylene blue FDA approved?
Yes, pharmaceutical methylene blue injection is FDA approved for acquired methemoglobinemia. It is not approved for cognitive or anti-aging uses.
Why does methylene blue turn urine blue?
The body excretes much of it unchanged through the kidneys, so the dye colors urine blue or green.
References
- Schirmer RH, et al. Lest we forget you, methylene blue... Neurobiol Aging. 2011;32(12):2325.e7-2325.e16.
- Guttmann P, Ehrlich P. Ueber die Wirkung des Methylenblau bei Malaria. Berliner Klinische Wochenschrift. 1891;28:953-956.
- Wainwright M, Crossley KB. Methylene blue: a therapeutic dye for all seasons? J Chemother. 2002;14(5):431-443.
- Rodriguez P, et al. Multimodal randomized functional MR imaging of the effects of methylene blue in the human brain. Radiology. 2016;281(2):516-526.
- Alda M, et al. Methylene blue treatment for residual symptoms of bipolar disorder: randomised crossover study. Br J Psychiatry. 2017;210(1):54-60.
Where FocusBlu fits
Methylene blue has a 150-year track record, but quality still varies widely between products. FocusBlu is a 1% methylene blue solution made with USP-grade methylene blue that is third-party tested before purchase, then formulated in small batches in Frisco, Texas. Five ingredients, all on the label: methylene blue (USP), purified water (USP), glycerin (USP), vitamin C, and stevia.
Learn more at focusblu.net.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Talk to your doctor before using methylene blue, especially if you take prescription medications.
