An insulin injection pen and blood glucose monitoring device is integrated into a single unit that fits in a user's clothing pocket or handbag. The device includes a blood glucose monitoring system for detecting the user's blood glucose level, an insulin injection mechanism, and a microprocessor that calculates an insulin dosage appropriate to the detected blood glucose level of a particular user and sets the insulin injection mechanism to administer the calculated insulin dosage. The device automatically informs a remote emergency service provider if the microprocessor determines that the detected blood glucose level presents a potential danger to the user. The microprocessor also calculates treatment regimens based on the detected blood glucose level and displays the treatment regimens on an LCD display. The device can include a GPS receiver that detects the location of the device, which is transmitted by the device to the remote emergency service.