Glucose level 180 before meal. what to do?

Whether you are a known diabetic or not, this is too high. You need to consult your doctor for a complete evaluation and management plan or an adjustment to your medications and/or diet.

a fasting glucose of "180" is an abnormal result, and may indicate onset of type 2 diabetes. A "2 0r 3 hour" glucose tolerance test may clarify this and result in recommendations for dietary changes or medication administration. See your internal medicine physician for guidance.