Rapid onset-fast acting insulin: It is fast acting so starts working within one to 20 minutes. It is clear in appearance and its peak time is about one hour later and lasts for three to five hours. When you inject rapid onset-fast acting type of insulin, you must eat immediately after you inject. The two rapid onset-fast acting insulin types currently available are:
Novo Rapid (Insulin Aspart)
Humalog (Lispro)
Short acting insulin: It looks clear and begins to lower blood glucose levels within 30 minutes, so you need to take your injection half an hour before eating. Short acting insulin has peak effect of four hours and works for about six hours. Short acting insulin types, currently available include:
Actrapid
Humulin
Hypurin Neutral (bovine - highly purified beef insulin)
Intermediate acting insulin:- Intermediate acting insulin looks cloudy. They have either protamine or zinc added to delay their action. This insulin starts to show its effect about 90 minutes after you inject, peak at 4 to 12 hours and lasts for 16 to 24hours.
Intermediate acting insulins presently available with protamine:
Protaphane
Humulin NPH
Hypurin Isophane (bovine)
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