- "Justin Claybourne owns Claybourne Pharmaceuticals that recently acquired the rights to this drug Dycloseral, which fights this particular strain of TB."
- —Oliver Queen[src]
Dycloseral or Dycloserol (as it was named on the manufacturer's website) was a medical drug produced by Claybourne Pharmaceuticals. It was able to cure people of a version of weaponized tuberculosis developed by AK Desmond Group at the behest of Justin Claybourne. Later on, Curtis Holt was infected by the drug after Prometheus's attack.
After AK Desmond Group caused a massive outbreak of weaponized tuberculosis in Lamb Valley, Claybourne Pharmaceuticals immediately increased the price of Dycloseral, the drug that they recently acquired rights to, from $10 a pill to $1,000 overnight, making it impossible for the poor people to get their hands on the cure. This caused the Hood to suspect Justin Claybourne as the man behind the crisis, and his suspicions proven correct. After Claybourne refused to correct his misdeeds, the Hood hunted him down at AK Desmond hideout and killed Claybourne, along with most of his bodyguards. After their CEO's death, the company shut down, and Dycloseral was no longer produced.
Hunting down Curtis Holt, Prometheus fought him and eventually threw a poisoned dart at Curtis's body, the dart laced with Dycloseral. Infecting Curtis with Dycloseral was a message directly to Oliver Queen, whose actions as the Hood led to the shutting down of the company that produced the drug. Although Dycloseral left Curtis dizzy, he eventually got better and returned to the Arrowcave to help Felicity Smoak.