A Florida father put a heartbreaking post on his Facebook page after his son overdosed on fentanyl and died.

Brett Gibney said, "This is how much fentanyl it takes to kill you!" in a post that has since gone viral. 

The post that was put up on July 27 and since then has been shared more than 24,000 times. 

"Brent had three and a half times the lethal dose in his system," Gibney said. "He thought it was heroin. We really want to send a strong message to people about fentanyl and how powerful these drugs are. We think that people are misled on how powerful these drugs really are."