An inventive drug delivery system includes a reservoir that holds a drug to be administered. A drug applicator injects or infuses the drug, and a pump generates a flow of the drug from the reservoir to the drug applicator. A control system has a pressure sensor that measures pressure signals indicative of resistance against the flow of the drug and a processor is in communication with the pressure sensor. The control system detects with the pressure sensor a pressure signal indicative of the resistance against the flow of the drug while the drug is being administered and compares the measured pressure signal to a reference value. The control system also generates display data and provides it to an output device when the measured pressure signal exceeds the reference value. The display data includes a scheduled test reminder for a glucose level test that is communicated to an output device.
