I'm assuming you mean Actoplus, which contains metformin and pioglitazone.
Insulin can be used with metformin so that is not of major concern, although there is a caution of risk of hypoglycemia when using these together.
The main interaction is between insulin and pioglitazone.
Coadministration of a thiazolidinedione in combination with insulin may increase the risk of edema compared to insulin alone. The mechanism is unknown but may involve enhancement of the antinatriuretic and/or peripheral vasodilatory effects of insulin.
Caution is advised during coadministration of thiazolidinedione and insulin therapy. Patients at risk for heart failure should be closely monitored. Patients should be advised to notify their physician immediately if they experience signs and symptoms of heart failure such as fluid retention, edema, rapid weight gain, or shortness of breath. Patients should also be apprised of the increased risk of hypoglycemia and be alert to potential signs and symptoms of hypoglycemia such as headache, dizziness, drowsiness, nausea, hunger, tremor, weakness, sweating, palpitations.
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