Final answer:
The nurse should instruct the client starting amitriptyline therapy to avoid sudden discontinuation of the medication and limit alcohol consumption.
Step-by-step explanation:
The nurse should provide the following instructions to the client who is about to begin amitriptyline therapy for major depressive disorder:
- Avoid sudden discontinuation of the medication: Abruptly stopping amitriptyline can cause withdrawal symptoms. The dosage should be gradually reduced under the guidance of a healthcare professional.
- Limit alcohol consumption: Alcohol can increase the sedative effects of amitriptyline and also worsen depression symptoms.