Drugmaker Eli Lilly warned this week that two of its formulations of insulin would be temporarily out of stock through the beginning of April, citing a “brief delay in manufacturing.”

The 10-milliliter vials of Humalog and insulin lispro injection will be in short supply at wholesalers and some pharmacies, Lilly said in a statement posted online Wednesday. The company said that prefilled pen versions of those medicines are still available in the US and that it continues to manufacture the 10-milliliter vials “and will ship them as soon as we can.”

More than 8 million people in the US rely on insulin to survive, according to the American Diabetes Association. Although other forms are available, it’s not always simple for patients to switch between different brands of insulin or delivery methods, said Laura Marston, an advocate for lower insulin prices who has type 1 diabetes and uses Humalog.

Marston said she gets a reaction when she uses an alternative brand, and she relies on Humalog vials for her insulin pump. She said she may be able to use the prefilled pens for her pump, but her insurance covers only vials, via a complicated step known as prior authorization.

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