In lower limb orthopedic surgeries there is significant postoperative pain, which is difficult to treat with oral or intravenous analgesics resulting in adverse endocrine, metabolic and inflammatory responses. Morphine, Pethidine, Fentanyl, and other opioids fall under the Narcotics Act whereas nalbuphine does not. So, the accessibility of Nalbuphine is not as major a concern in several hospitals in India as that of morphine and other such opioids. Present study was aimed to compare the effectiveness of 0.8mg nalbuphine with 20 mcg fentanyl as an adjuvant to hyperbaric bupivacaine in lower limb orthopedic surgeries.