Medicament delivery devices are described herein. In some embodiments, an apparatus includes a medical injector and an electronic circuit system. The medical injector includes a housing, a medicament container, and a medicament delivery member. The housing defines a first region and a second region. The first region includes the medicament container and is physically isolated from the second region. The electronic circuit system is configured to be disposed within the second region defined by the housing. The electronic circuit system is configured to output an electronic output associated with a use of the medical injector.