What happens when sugar level goes down?

Normally, the blood glucose levels are kept within physiological limits by the action of insulin and glucagon, working in tandem. In type 2 Diabetes Mellitus, this balance is disturbed. Low sugar in the blood is always due to improper dosing (increased dose) of drugs and insulin for which dose of drugs and insulin should be reduced or else it can even lead to seizures, coma and death. In an acute setting, hypoglycemia is always far more dangerous than hyperglycemia hence it is wise to err on the high sugar levels when using drugs.