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Permanent retinal damage following massive dapsone overdose
The British Journal of Ophthalmology
|October 1, 1980
Summary
A massive dapsone overdose caused permanent vision loss due to retinal necrosis. This rare side effect highlights the severe risks of extreme drug dosages, even in leprosy treatment.
Area of Science:
- Ophthalmology
- Pharmacology
- Toxicology
Background:
- Dapsone (4,4'-diamino, diphenyl sulphone) is a key treatment for tuberculoid leprosy.
- Long-term dapsone therapy carries known risks, but severe ocular toxicity is rare.
Observation:
- A patient on long-term dapsone therapy attempted suicide with a 7.5g overdose.
- The patient subsequently developed permanent bilateral retinal necrosis.
Findings:
- The overdose induced severe hemolytic anemia, methemoglobinemia, and acute renal failure.
- Retinal damage is hypothesized to result from hypoxemia and red blood cell fragmentation causing vascular occlusion.
Implications:
- This case suggests a previously unreported severe ocular side effect of dapsone.
- Highlights the critical need for careful dosage monitoring and awareness of potential toxicities in high-dose scenarios.