The home care nurse is making a monthly visit to a client with a diagnosis of pernicious anemia who has been receiving a monthly injection of cyanocobalamin (vitamin B12). Before administering the injection, the nurse evaluates the effects of the medication and determines that a therapeutic effect is occurring if the client makes which statement?
1. "I feel really lightheaded."
2. "I no longer have any nausea."
3. "I have not had any pain in a month."
4. "I feel stronger and have a much better appetite."