Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Yes, exactly, that is right. Steroid causes hyperglycemia and increases blood sugar level which can increase your inj lantus requirement.and about lantus that s a peak less insulin so it can maintain your sugar without causing hypoglycemia. Maybe you miss something to describe or something is wrong there. Hope I have answered your query. Let me know if I can assist you further.