In the fifth, Pagan told head trainer Ray Ramirez that he needed to come out of the game, and Ramirez proceeded to alert manager Terry Collins.
"I was in the outfield, and I felt like I wanted to sit down in the outfield, because I just felt like my body was getting very heavy," Pagan said. "I just had to tell the trainer about it, because I wasn't feeling that well."
Pagan exited in the bottom of the fifth, replaced by Jason Pridie, and was checked by a doctor.
Pagan did not require an IV and believes he should be fine for Monday's game against the Reds at Great American Ball Park.
"I've been drinking since I came out of the game, so that's enough for me," he said. "Right now I feel much better. Hopefully tomorrow I feel fine."
Christina De Nicola is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.