A nurse is collecting data from a client who is taking dimenhydrinate to treat motion sickness. Which of the following findings is an adverse effect of this medication?

A. "Instruct the client's visitors not to operate the PCA pump.” Only the client should press the PCA button to self-administer medication. Allowing visitors or family members to press the button ("PCA by proxy") increases the risk of over-sedation, respiratory depression, and opioid toxicity. The nurse should reinforce to visitors that only the client should control medication delivery based on their own pain level.

B. "Check the client's pain level every 8 hours." Pain assessment should be performed more frequently than every 8 hours when a client is receiving morphine PCA. Pain, sedation level, and respiratory status should be monitored every 1–2 hours initially and then at regular intervals as determined by hospital protocol to ensure effective pain management and prevent complications such as respiratory depression.

C. "Diarrhea is an adverse effect of morphine PCA." Morphine is an opioid analgesic that commonly causes constipation, not diarrhea. Opioids slow gastric motility, which can lead to delayed bowel movements, bloating, and discomfort. Clients on long-term opioid therapy often require stool softeners or laxatives to prevent opioid-induced constipation.

D. "Using morphine PCA increases the client's risk of toxicity." PCA pumps are designed with preset dose limits and lockout intervals to prevent overdose. While there is a risk of opioid toxicity if the system is misused (e.g., PCA by proxy or improper settings), PCA is actually safer than traditional opioid administration methods because it allows for precise dosing and patient-controlled pain management. Proper monitoring helps prevent complications.

A. Restart the infusion in the other extremity. While the IV infusion will need to be restarted in a new site, the priority after discontinuing the infusion is to manage the complications of IV infiltration. Restarting the infusion should be done after addressing the swelling and discomfort in the affected limb.

B. Elevate the extremity. Elevating the extremity reduces swelling and promotes fluid reabsorption following an IV infiltration. This helps minimize pain, tissue damage, and further complications, such as compartment syndrome. It is the next priority action after stopping the infusion.

C. Remove the catheter. The catheter should already be removed when the infusion is discontinued due to suspected infiltration. Keeping it in place could worsen tissue swelling and damage. If the catheter has not been removed yet, doing so is essential, but managing swelling and discomfort remains the priority after removal.

D. Apply warm, moist compresses to the site. Warm compresses are typically used for extravasation of non-vesicant solutions to promote circulation and absorption. However, in cases of severe infiltration or swelling, cold compresses may be used initially to reduce inflammation before applying warmth. The priority action is elevation, followed by applying appropriate compresses based on facility protocol.