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Isosorbide is the correct answer because it is a contraindication for clients requesting a prescription for sildenafil due to erectile dysfunction. Isosorbide is a nitrate medication used to treat chest pain or heart failure. When combined with sildenafil, a medication used for erectile dysfunction, it can cause a severe drop in blood pressure leading to a serious health risk called hypotension. Therefore, it is important to avoid prescribing isosorbide and sildenafil together.

Paracetamol, aspirin, and atorvastatin are not contraindications for clients requesting sildenafil for erectile dysfunction.