in studies in relatively small groups of postoperative patients with moderate to severe pain , one or a few doses of buprenorphine parenterally ( by intramuscular or slow intravenous injection ) or sublingually were at least as effective as standard doses of other strong analgesics such as morphine , pethidine or pentazocine , and buprenorphine was longer acting than these agents .
C0030193
pain
C0025376
pethidine