Integrated insulin delivery system having safety features to prevent hypoglycemia

An insulin pump for administering a dose of insulin for a user, comprising:

• a processor configured to:
• cause the insulin pump to administer the dose of insulin to the user, wherein the insulin pump is configured to be worn externally on the user, wherein the insulin pump comprises a reservoir and a cannula, and a communication device:
• transmit insulin delivery information to a handheld device;
• receive a delivery control signal;
• administer, while a current basal rate is suspended, the dose of insulin as an instantaneous bolus based on the delivery control signal;
• and
• resume the current basal rate after the instantaneous bolus is completed;
• an integrated control unit with a selectable button, wherein the integrated control unit is configured to:
• detect activation of the selectable button;
• and
• transmit, responsive to detecting activation of the selectable button, the delivery control signal to the processor, and wherein the delivery control signal comprises a bolus amount to be administered with the instantaneous bolus.