Final answer:
A 2-week waiting period is recommended when switching from phenelzine to tranylcypromine to ensure the first medication is fully cleared from the body. This helps prevent potential interactions between the medications.
Step-by-step explanation:
When switching from phenelzine to tranylcypromine, a 2-week waiting period is recommended. This is because both phenelzine and tranylcypromine are monoamine oxidase inhibitors (MAOIs), which can interact with other medications and certain foods. The waiting period helps to ensure that the first medication is fully cleared from the body before starting the new medication to avoid any potential interactions. It is important to follow the recommendations of a healthcare professional when transitioning between these medications.