Drug interactions are present.
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) interferes with blood sugar control by reducing the efficiency of Lantus(Insulin Glargine
Monitor your blood sugar closely.
You may need a dose adjustment of your anti diabetics during and after the treatment with levothyroxine.
increases the effect of insulin Glargine and may cause your blood sugar to go too low. Watch for symptoms of hypoglycemia
like headache, dizziness, sweating and fast heart beat. Again dose adjustment and frequent monitoring of blood is needed.
Discuss with your doctor before starting any medications.
So in my opinion these drugs are compatible with each other but needs dose adjustments and motioning of blood sugar.
Hope the answer helps you.
Let me know if there is any clarification.