Answer
The pen contains a ready-to-use multidose liquid. The vial contains single-use powder that must be mixed with its solvent immediately before injection; mixing compatibility with additional follitropin alfa also differs.
Sources for this answer
- Pergoveris 450IU Pen — Current selected SmPCemc · Summary of Product Characteristics
- Pergoveris 150 IU/75 IU powder and solvent for solution for injection — Current selected SmPC