A wearable injector for delivering a drug into a body part of a patient comprising: a housing; a base connected with the housing and releasably securable on the body part of the patient; and a delivery system comprising: a container sub-assembly for containing the drug; a drive control sub-assembly coupled with the container sub-assembly and configured for controlling delivery of the drug into the patient; a flow-path sub-assembly providing a fluid path with the container sub-assembly via which a fluid can be introduced into the container sub-assembly and via which the drug can be extracted from the container sub-assembly, wherein the drive control sub-assembly engages the flow-path sub-assembly to cause the fluid to be introduced into the container sub-assembly and to cause the drug to be extracted from the container and delivered into the patient; and a sensor (310; 320; 330) for detecting one of temperature of the body part, temperature of the drug in the container subassembly, and orientation of the container sub-assembly; and a controller receiving an input from the sensor and controlling the drive control sub-assembly based upon the input to set a state of the injector; characterized by a carrier rotatably arranged within the housing and base, the delivery system on the carrier. a housing; a base connected with the housing and releasably securable on the body part of the patient; and a delivery system comprising: a container sub-assembly for containing the drug; a drive control sub-assembly coupled with the container sub-assembly and configured for controlling delivery of the drug into the patient; a flow-path sub-assembly providing a fluid path with the container sub-assembly via which a fluid can be introduced into the container sub-assembly and via which the drug can be extracted from the container sub-assembly, wherein the drive control sub-assembly engages the flow-path sub-assembly to cause the fluid to be introduced into the container sub-assembly and to cause the drug to be extracted from the container and delivered into the patient; and a sensor (310; 320; 330) for detecting one of temperature of the body part, temperature of the drug in the container subassembly, and orientation of the container sub-assembly; and a controller receiving an input from the sensor and controlling the drive control sub-assembly based upon the input to set a state of the injector; characterized by a carrier rotatably arranged within the housing and base, the delivery system on the carrier. a container sub-assembly for containing the drug; a drive control sub-assembly coupled with the container sub-assembly and configured for controlling delivery of the drug into the patient; a flow-path sub-assembly providing a fluid path with the container sub-assembly via which a fluid can be introduced into the container sub-assembly and via which the drug can be extracted from the container sub-assembly, wherein the drive control sub-assembly engages the flow-path sub-assembly to cause the fluid to be introduced into the container sub-assembly and to cause the drug to be extracted from the container and delivered into the patient; and a sensor (310; 320; 330) for detecting one of temperature of the body part, temperature of the drug in the container subassembly, and orientation of the container sub-assembly; and a controller receiving an input from the sensor and controlling the drive control sub-assembly based upon the input to set a state of the injector; characterized by a carrier rotatably arranged within the housing and base, the delivery system on the carrier.