"... riding his shaggy, six-headed ___ ..."

• Painkiller withdrawn in 2004
• Withdrawn painkiller from Merck
• 2004 Merck recall
• A Cox-2 inhibitor (trade name Vioxx) that relieves pain without harming the digestive tract

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
VIOXX \VI`OXX\ (v[imac]"[o^]ks), prop. n. [Trade name, used by Merck & Co.] (Chem. & Med.) A trade name for rofecoxib . [Trade name]