One or more embodiments of the disclosure are related, generally, to a reusable accessory for a manual medication delivery device. Such a reusable accessory may include a wireless communication interface, a detection circuitry, and a recommendation system. In one or more embodiments, an adapter may be configured to reversibly couple such a reusable accessory to a manual medication delivery device. Dosing events may be detected that are associated with dosing at the manual medication delivery device. Dose recommendations may be provided responsive to analyte measurements and/or dosing events.