A nurse is providing teaching to an adolescent who has type 2 diabetes mellitus and a new prescription for metformin. Which of the following Instructions should the nurse include in the teaching?

"Expect the medication to cause constipation for the first few days of therapy."

"Take the medication at the same time each day."

"This medication is used for short-term therapy until your symptoms improve."

"Take this medication 1 hour before meals."