Some side effects are hypoglycemia (low blood sugar), hypokalemia (low blood potassium), and allergic reactions. Allergy to<unk> affected about 2% of people, of which most reactions are not due to the<unk> itself but to preservatives added to<unk> such as zinc, protamine, and meta-cresol. Most reactions are Type I hypersensitivity reactions and rarely cause anaphylaxis. A suspected allergy to<unk> can be confirmed by skin prick testing, patch testing and occasionally skin biopsy. First line therapy against<unk> hypersensitivity reactions include symptomatic therapy with antihistamines. The affected persons are then switched to a preparation that does not contain the specific agent they are reacting to or undergo desensitization. Cutaneous adverse effects Other side effects may include pain or skin changes at the sites of injection. Repeated subcutaneous injection without site rotation can lead to lipohypertrophy and amyloidomas, which manifest as firm palpable nodules under the skin.
Insulin 
Regular insulin
Pulsatile insulin
Lente insulin
Proglucagon
Ultralente insulin
Glucuronide
Glucagon 