Carfentanil

Carfentanil or carfentanyl is an analog of the synthetic opioid analgesic fentanyl. A unit of carfentanil is 100 times as potent as the same amount of fentanyl, 5,000 times as potent as a unit of heroin and 10,000 times as potent as a unit of morphine. Carfentanil was first synthesized in 1974 by a team of chemists at Janssen Pharmaceutica which included Paul Janssen. It is classified as Schedule II under the Controlled Substances Act in the United States with a DEA ACSCN of 9743 and a 2016 annual aggregate manufacturing quota of 19 grams (less than 0.7 oz.).

Story
When the mercenaries betrayed the Dinosaur Protection Group, one of them shot Blue with a dart of carfentanil. The drug didn't take effect quickly enough, and she was able to attack and kill one of the mercenaries before finally collapsing due to a combination of the tranquilizer and a gunshot wound. Ken Wheatley also shot Owen Grady with one. Dr. Zia Rodriguez pulled the dart out of Owen before it had a chance to fully inject its full dose, however, allowing Owen to recover and escape the lava flow after Wheatley and his men abandoned him to die. The mercenaries, like their predecessors, used carfentanil as their tranquilizer of choice, with Wheatley pulling teeth from drugged dinosaurs to add to his dinosaur teeth collection.

At Lockwood Manor, following the failure of the Lockwood Manor Auction, Wheatley shot the Indoraptor with two darts of the drug in the hopes of tranquilizing him so he could obtain one of his teeth. However, even two darts' worth of carfentanil failed to completely knock the hybrid unconscious, and he woke up, dismembering and eating Wheatley before also slaughtering Gunnar Eversol and an entire elevator full of people.

Dr. Henry Wu ordered his team of scientists to gather everything up to evacuate as a result of the escape of the Indoraptor. He ordered one to get him 50 CCs of carfentanil to use to tranquilize the captive Blue so he could get a blood sample from her, rather than take the entire Velociraptor with him, little suspecting the "scientist" was in fact Franklin Webb in disguise. While Wu was arguing with a captive Zia about whether or not she would cooperate in helping him take a blood sample, Franklin sneaked up behind Wu and jammed a syringe full of the carfentanil he'd asked for into his neck, knocking the scientist out instantly.