Final answer:
During labor, the most common pain medications administered are opioids such as morphine, oxycodone, and codeine, which can be given through IV or oral tablets.
Step-by-step explanation:
During labor, the most common pain medications administered are opioids such as morphine, oxycodone, and codeine. These medications are typically given through intravenous (IV) injection or oral tablets. Non-opioid medications may also be used, such as acetaminophen or non-steroidal anti-inflammatory drugs (NSAIDs), which can be given orally or through IV.