Diabetes: What's the name of this antibiotic?

Several antibiotics directly interfere with insulin uptake. This particular antibiotic has all sorts of warnings about adjusting insulin dose in the package liner notes. Dunno, just what it says. I've never heard about antibiotic affecting blood glucose before. I wonder if it's a warning along the lines of "if you're sick enough to need this medication, you might be sick enough that your blood sugar will be wonky, so keep a close eye on it". What's the name of this antibiotic?

This was one of the cephlosporins, Keflex I believe. I just looked at one web reference just now and did not see reference to the general effect on diabetes, but did see a mention of interaction with Metformin. The warning I have seen before was a caution that adjustment of diabetes medicine in general may be necessary.