A 40 years old female is diagnosed to have epilepsy and is staed phenytoin and valproate. Four weeks later, she developed a diffuse rash all over her body, which gradually disappeared on stopping both the drugs. In how many weeks, will the rash reappear when she is re-challenged with phenytoin and valproate?

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Vikas Bhardwaj
Medical Technologist, AIIMS New Delhi
Updated: Apr 17, 2026