Medical system and method employing a drug delivery assembly

A medical system includes a muscular-tension-measuring device and a drug delivery assembly. The muscular-tension-measuring device is operatively connectable to a patient and includes a device output having a device output signal which varies with involuntary changes in muscular tension of the patient. The drug delivery assembly is operatively connectable to the patient for controllably delivering at least one drug to the patient. In one implementation, the device output signal varies with involuntary changes in muscular tension of the patient caused by pain and/or anxiety. In one employment, drug delivery is varied by a controller or a user based at least on variations in the device output signal. A method for conscious sedation of a patient includes measuring muscular tension of the patient and includes varying delivery of a conscious sedation drug to the patient based at least on variations in the measured muscular tension of the patient.