**Question:** The long acting analgesic used in post operative pain is

A. Morphine
B. Tramadol
C. Paracetamol
D. Codeine

**Core Concept:**
Postoperative pain management involves the use of appropriate analgesics to provide effective pain relief without causing significant side effects. Long-acting analgesics are designed to provide continuous pain relief over an extended period, ensuring that patients can maintain their activities of daily living and recover more comfortably.

**Why the Correct Answer is Right:**
The correct answer, B. Tramadol, is a centrally acting opioid analgesic that inhibits the reuptake of norepinephrine and serotonin, leading to central sensitization and increased pain threshold. Tramadol has a long half-life, making it suitable for providing sustained analgesia in the postoperative period.

**Why Each Wrong Option is Incorrect:**
A. Morphine is a potent opioid analgesic, but its short half-life does not make it suitable for long-term pain management post-operatively.
B. Paracetamol is a non-opioid analgesic used for mild to moderate pain relief, but it is not an opioid and lacks the sustained effect required for postoperative pain management.
C. Codeine is another opioid analgesic, but its short half-life and lack of strong central action make it unsuitable for long-term postoperative pain relief.

**Clinical Pearl:**
Tramadol is frequently used as a first-line choice for long-acting postoperative pain management due to its balanced opioid-like action and extended duration of action.

**Correct Answer:** B. Tramadol