Fluoxetine can increase the effects of insulin lispro protamine + insulin lispro. The leaflet lists it alongside other medicines (such as ACE inhibitors and MAOIs) that can do the same, but only fluoxetine is the one you're taking with this insulin.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.