Nikhil Prasad Fact checked by:Thailand Medical News Team Mar 12, 2026 2 hours, 8 minutes ago
Medical News: A medication commonly prescribed to help people overcome alcohol addiction may, in rare cases, lead to serious vision problems. Doctors are now warning that the drug disulfiram, widely known by the brand name Antabuse, could cause a rare but potentially reversible form of optic nerve damage known as toxic optic neuropathy.
Doctors report rare but reversible vision loss linked to disulfiram therapy for alcohol addiction
Researchers from the Department of Ophthalmology, Hospital Espírito Santo in Évora, Portugal, and the Department of Ophthalmology at Emory University in Atlanta, United States, recently reported two striking cases that highlight how this medication can affect eyesight. Their findings provide important insights for doctors who prescribe the drug and for patients undergoing treatment for alcohol dependence.
Understanding Toxic Optic Neuropathy
Toxic optic neuropathy occurs when certain chemicals or medications damage the optic nerve, the bundle of nerve fibers that carries visual information from the eye to the brain. When this nerve is injured, people may experience gradual vision loss in both eyes, difficulty distinguishing colors, and blind spots in the center of their vision.
Many medications have already been linked to this condition, including antibiotics such as ethambutol and linezolid. However, optic nerve damage caused by disulfiram has rarely been documented, making the newly reported cases particularly important.
How Disulfiram Works
Disulfiram is designed to discourage drinking by producing unpleasant physical reactions when alcohol is consumed. The drug blocks an enzyme called aldehyde dehydrogenase, causing a buildup of acetaldehyde in the body when alcohol is present.
This buildup leads to symptoms such as nausea, flushing, headache, vomiting, dizziness, chest discomfort, and rapid heartbeat. Because these reactions can occur within 10 to 30 minutes of drinking alcohol, the medication helps reinforce sobriety in people struggling with alcohol use disorder.
However, as highlighted in this
Medical News report, the drug may also carry unexpected neurological risks.
Two Patients Experience Sudden Vision Loss
The researchers described two men with alcohol use disorder who developed vision problems after prolonged use of disulfiram.
The first patient, a 52-year-old man, had been taking 250 milligrams of disulfiram daily for about nine months. He began experiencing painless and progressive loss of vision in both eyes. When examined, his visual acuity had dropped to 20/100 in one eye and 20/70 in the other. He also had severe difficulty identifying colors and developed central blind spots known as scotomas.
The second patient, aged 55, had been using the same dose of disulfiram for five years. He presented with central vision loss in both eyes, along with reduced visual acuity and pronounced color vision impairment.
Doctors conducted extensive testing on both patients. Brain scans, autoimmune screenings, infectious disease tests, nutritional assessments, heavy metal screening, and genetic testing for inherited optic nerve diseases all returned normal results. This strongly pointed to disulfiram as the likely cause of their optic nerve damage.
Vision Improves After Stopping the Drug
Encouragingly, both patients experienced major improvements after discontinuing disulfiram.
In the first case, vision gradually improved over seven months, reaching 20/40 in one eye and 20/30 in the other. His visual fields also returned to normal. The second patient recovered even faster, regaining perfect 20/20 vision in both eyes within three months, along with complete restoration of color vision.
Despite this recovery, imaging scans showed that some structural damage to the optic nerve fibers remained. This suggests that while vision may return, subtle nerve changes can persist.
Why Early Detection Matters
The researchers believe mitochondrial dysfunction—a problem affecting the cell’s energy-producing structures—may play a role in how disulfiram damages the optic nerve. Similar mechanisms are seen in nutritional deficiencies and certain inherited optic nerve disorders.
These findings highlight the importance of recognizing symptoms early. If vision problems are detected quickly and the medication is stopped, significant recovery may still be possible.
Conclusion
The cases emphasize that disulfiram, although effective in supporting alcohol abstinence, may occasionally trigger toxic optic neuropathy. Doctors should be alert to vision changes in patients taking the medication and consider immediate evaluation if symptoms appear. Early drug discontinuation can allow meaningful recovery of sight, though structural nerve changes may remain. Greater awareness among clinicians and patients can help ensure that this rare complication is recognized quickly and managed effectively.
The study findings were published as an abstract in the peer reviewed journal: Frontiers in Neurology
https://www.frontiersin.org/journals/neurology/articles/10.3389/fneur.2026.1793252/abstract
For the latest adverse effects of certain drugs and medications, keep on logging to Thailand
Medical News.
Read Also:
https://www.thailandmedical.news/articles/med-news
https://www.thailandmedical.news/articles/ophthalmology-(eye-diseases)
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