Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
A single acute administration of morphine on experimental day 1 produces analgesia to mechanical stimulation with von Frey hairs in both infant and young rats. The highest dose of morphine produced a transient decrease in mechanical thresholds in infant rats at 24 hours post-morphine (experimental day 2). Data is average ± SEM (n=5−6/group).α p<0.05 compared to time matched saline injected. *p<0.05 compared to baseline from time matched saline injected animals.
