Finnish to English Other Medical (general)

From a medical report:

"Potilasohjauksessa psoripotilaalle vaihdettu [lääke X] perhesuunnittelun perusteella"

Here, "[lääke X]" is the name of a specific medication ("Medication X").

Does this mean that:

1) The patient was switched to Medication X (having previously been on another medication)

or that

2) The Medication X that the patient had been receiving was switched (to something else)

?

Contextually, option #1 seems much likelier to me, but it doesn't quite square with the meaning of "vaihtaa" that I know ("to replace", etc.). If one is replacing X with Y, then I expect the direct object of "vaihtaa" to be X, and the indirect object to be Y.

Thanks