Lupus-scleroderma syndrome induced by ethosuximide

Area of Science:

• Rheumatology
• Dermatology
• Clinical Pharmacology

Background:

• Anticonvulsant medications are widely used for epilepsy management.
• Drug-induced autoimmune conditions can mimic systemic lupus erythematosus and scleroderma.
• The specific association between ethosuximide and these autoimmune features requires further investigation.

Observation:

• A young Chinese girl developed features of both systemic lupus erythematosus and scleroderma.
• These symptoms emerged during treatment with multiple anticonvulsant drugs.
• Clinical signs improved significantly upon withdrawal of the anticonvulsant therapy.

Findings:

• Readministration of ethosuximide for epilepsy control led to a relapse.
• The relapse predominantly presented with sclerodermatous features.
• Resolution of clinical signs occurred again after ethosuximide withdrawal, confirming a causal link.

Implications:

• Ethosuximide may trigger or exacerbate autoimmune conditions like lupus and scleroderma.
• Careful monitoring for autoimmune symptoms is crucial in patients on long-term anticonvulsant therapy.
• This case highlights the importance of considering drug-induced etiology in autoimmune presentations.