The US Food and Drug Administration issued a warning Tuesday about compounded versions of the drug semaglutide, which is approved for treatment of diabetes and excess weight.

What is a compounding pharmacy? Compounding pharmacies use active pharmaceutical ingredients – the part of the medication that produces therapeutic effects – to make new formulations of drugs.

Compounding pharmacies have been allowed to essentially make a cheaper version of Eli Lilly's Zepbound, but they have to stop Wednesday. That has left many patients wondering what to do next.