A medicated module (100) for an injection system to co-deliver at least two medicaments is disclosed where a primary delivery device containing a primary medicament accepts a medicated module containing a single dose of a secondary medicament and where both medicaments are delivered through a hollow needle. The medicated module does not require the user to manually engage a reservoir containing the secondary medicament. Instead, a biasing member automatically activates the reservoir when the needle guard is retracted. The needle guard prevents accidental needle sticks before and after an injection, and locks after dose delivery. Magnet elements are provided in association with the medicated module that may be in a first, trigger locked position, and a second, triggerable position when moved by the force of another magnetic element, or by the force of the first magnet element on magnetic material.
