This Minnesota bill prohibits health plans from making certain formulary changes during a plan year for enrollees who have already been prescribed a drug. Specifically, it prevents the removal of a drug from the formulary or an increase in the cost of a drug for the duration of the enrollees' plan year, with certain exceptions.

Exceptions include: 1. If the drug is deemed unsafe by the FDA, withdrawn by the FDA or manufacturer, or if new research indicates serious risks. 2. If a brand-name drug is replaced by a therapeutically equivalent or interchangeable generic or biosimilar drug at a lower cost, provided at least 60 days' notice is given to prescribers, pharmacists, and affected enrollees.

The bill aims to ensure prescription drug stability for enrollees while allowing necessary changes to protect patient safety and reduce costs.