(WTNH) - Connecticut Senator Chris Murphy wants drug companies to explain why the price of insulin continues to skyrocket.

Murphy and other members of the Senate Health, Education, Labor and Pensions Committee have sent a letter to executives at Eli Lilly, Novo Norodisk and Sanofi seeking information about the rising costs for patients.

The senators say some patients are actually turning to GoFundMe pages to request help paying for insulin, and others report having to ration their doses.