A 35-year-old woman with systemic lupus erythematosus (SLE) on long-term hydralazine therapy presents with fever, arthralgia, and a malar rash 18 months after starting the drug. Investigations show positive ANA, elevated ESR, and negative anti-dsDNA antibodies. She has no prior history of SLE exacerbation. What is the most appropriate immediate next step in management?

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