m not a medical professional, just the parent of a kid with
diabetes. Lantus is a long acting
insulin that starts working within 1 to 2 hours, with a minimal peak in about 6 hours, and lasts 24 hours. You take one shot of it for your long acting insulin, and you still need to take a fast acting insulin to cover your corrections and meals. It is provides a fairly constant basal insulin all day long.