Republican Sen. Chuck Grassley is demanding answers from a key drug company on why the vital allergic medication EpiPen has increased by more than $500 in some cases.

The Iowa senator wrote a letter to the CEO of Mylan, which distributes the drug, to ask why the “much-needed medication” has seen an increase in price. He asked about whether the company offers any patient assistance programs for providing the drug, and singled out help given to schools.

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