A system comprising: - a first pen injection device holding a first specific type of medicament and comprising a first dose expelling mechanism, first pen communication means, and first indication means which in a first state indicates that the first dose expelling mechanism is to remain idle and in a second state indicates that the first dose expelling mechanism is available for operation, - a second pen injection device holding a second specific type of medicament and comprising a second dose expelling mechanism, second pen communication means, and second indication means which in a first state indicates that the second dose expelling mechanism is to remain idle and in a second state indicates that the second dose expelling mechanism is available for operation, - a mobile communication unit comprising mobile communication means adapted to communicate with the first pen communication means and the second pen communication means, and - a software application program configured to determine a recommended type of medicament to be delivered to a user as one of the first specific type of medicament and the second specific type of medicament based on information indicative of a physiological condition of the user, wherein the mobile communication unit is configured to, via a communication from the mobile communication means to at least one of the first pen communication means and the second pen communication means, - prompt a change of state of the first indication means from the second state to the first state and/or a change of state of the second indication means from the first state to the second state in response to the recommended type of medicament to be delivered being the second specific type of medicament, and - prompt a change of state of the second indication means from the second state to the first state and/or a change of state of the first indication means from the first state to the second state in response to the recommended type of medicament to be delivered being the first specific type of medicament. - a first pen injection device holding a first specific type of medicament and comprising a first dose expelling mechanism, first pen communication means, and first indication means which in a first state indicates that the first dose expelling mechanism is to remain idle and in a second state indicates that the first dose expelling mechanism is available for operation, - a second pen injection device holding a second specific type of medicament and comprising a second dose expelling mechanism, second pen communication means, and second indication means which in a first state indicates that the second dose expelling mechanism is to remain idle and in a second state indicates that the second dose expelling mechanism is available for operation, - a mobile communication unit comprising mobile communication means adapted to communicate with the first pen communication means and the second pen communication means, and - a software application program configured to determine a recommended type of medicament to be delivered to a user as one of the first specific type of medicament and the second specific type of medicament based on information indicative of a physiological condition of the user, wherein the mobile communication unit is configured to, via a communication from the mobile communication means to at least one of the first pen communication means and the second pen communication means, - prompt a change of state of the first indication means from the second state to the first state and/or a change of state of the second indication means from the first state to the second state in response to the recommended type of medicament to be delivered being the second specific type of medicament, and - prompt a change of state of the second indication means from the second state to the first state and/or a change of state of the first indication means from the first state to the second state in response to the recommended type of medicament to be delivered being the first specific type of medicament.