Final answer:
In renal failure, it is important to avoid NSAIDs, opioids, and short-acting analgesics due to potential kidney damage and other side effects.
Step-by-step explanation:
In the case of treating a patient with renal failure, it is important to avoid certain types of pain medications. One group to avoid is NSAIDs (non-steroidal anti-inflammatory drugs) like ibuprofen, as they can increase the risk of kidney damage and worsen renal failure. Another group to avoid is opioids, which can have serious side effects and carry a risk of addiction. Short-acting analgesics may not be the best choice either, as they often contain medications that can be harmful to the kidneys.