Final answer:
The nurse should instruct the client to allow 2 to 4 weeks for the full therapeutic effect of buspirone, take a missed dose as soon as remembered, and not stop the medication abruptly or consume grapefruit juice.
Step-by-step explanation:
When instructing a client who has a prescription for buspirone to treat anxiety, certain key points should be included in the teaching. The correct instruction is to allow 2 to 4 weeks for the full therapeutic effect of buspirone. This time frame is needed for the medication to build up in the system and produce its full anxiolytic effect. It's also important to inform the client to take a missed dose as soon as they remember, unless it's almost time for their next dose, in which case the missed dose should be skipped to avoid double dosing. Contrary to what might be assumed, the client should not consume grapefruit juice as it can interfere with the metabolism of buspirone, leading to increased levels of the medication and potential side effects. Additionally, the client should not abruptly stop the medication if they are no longer experiencing anxiety without consulting their healthcare provider, as this could lead to withdrawal symptoms. Tapering off the medication under medical supervision is typically recommended.