To control pain in long standing cancer cases, the recommended route of administration is:
**Core Concept**
The question is testing the understanding of the pharmacological management of chronic pain, specifically in cancer patients. The underlying principle is the use of opioid analgesics to manage pain, with a focus on the most effective route of administration.
**Why the Correct Answer is Right**
The correct answer is **C. Oral**. This is because oral administration of opioids is the preferred method for long-term pain management in cancer patients. Oral opioids have a predictable pharmacokinetic profile, which allows for dose titration and minimization of side effects. Additionally, oral administration is more convenient and easier to manage for patients with chronic pain.
**Why Each Wrong Option is Incorrect**
**Option A:** Intravenous (IV) administration is not recommended for long-term pain management due to the risk of dependence, tolerance, and the need for frequent hospital visits.
**Option B:** Transdermal administration, although useful for steady-state pain management, is not the preferred initial route of administration in cancer patients.
**Option D:** Intralesional administration is not typically used for cancer pain management, as it is more effective for localized pain relief.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that non-opioid analgesics, such as NSAIDs and acetaminophen, should be used in conjunction with opioids to minimize the risk of opioid-related side effects and to maximize pain relief.
**Correct Answer:** C. Oral.