If you are having an episode of hypoglycemia (low blood sugar), or if you are in a state of diabetic ketoacidosis. 
Lantus (insulin glargine) is a man-made form of a hormone that is produced in the body. It works by lowering levels of glucose (sugar) in the blood. Insulin glargine is a long-acting form of insulin that is slightly different from other forms of insulin that are not man-made. Lantus is used to treat type 1 or type 2 diabetes. Lantus may also be used for purposes not listed in this medication guide. Before taking this medicine. You should not use Lantus if you are allergic to insulin glargine, or: if you are having an episode of hypoglycemia (low blood sugar); or. if you are in a state of diabetic ketoacidosis (call your doctor for treatment with a short-acting insulin). 1 Each time you inject Lantus, you will need to use a new needle. 2  To use Lantus from the vial, you will need insulin syringes with needles. 3  Because Lantus is a solution, not a suspension, you don't need to shake or swirl it. 4  Never mix Lantus with any other insulin in the same syringe. 5  Never dilute it. So the manufacturer of Lantus recommends it should not be mixed with any other type of insulin in the same syringe. One easy way of making sure you don't mix Lantus with any other insulin is to take the Lantus with a vial and syringe (no Lantus pen cartridge is yet available), and take the other insulin with a pen. Lantus is a long-acting insulin that works for 24 hours and should be taken regularly at the same time each day. If you miss taking your dose at the regular scheduled time, your blood sugar levels may become high (hyperglycaemia). If your insulin glargine comes in vials, you will need to use syringes to inject your dose. Ask your doctor or pharmacist to show you how to inject insulin glargine using a syringe. Ask your doctor or pharmacist if you have questions about the type of syringe you should use. You should not use Lantus if you are having an episode of hypoglycemia (low blood sugar), or if you are in a state of diabetic ketoacidosis. Never share a Lantus injection pen or cartridge with another person. You will likely use a “pen” delivery system to administer the medicine in the cartridges. Your doctor will show you the correct way to inject under your skin and avoid veins and muscles. Before you administer your Lantus, wash your hands and wipe the injection site with an alcohol pad to reduce the risk of infections.
http://www.drugs.com/lantus.html http://www.drugs.com/lantus.html http://diabetes.emedtv.com/lantus/lantus-p2.html http://nfb.org/images/nfb/publications/vod/vodsum0401.htm http://www.news-medical.net/drugs/Lantus.aspx https://www.nlm.nih.gov/medlineplus/druginfo/meds/a600027.html http://www.drugs.com/lantus.html https://www.sharecare.com/health/antidiabetic-drugs/how-should-i-take-lantus
when should i not inject my lantus