Cinchophen (trade names Atophan, Quinophan, and Phenaquin) is an analgesic drug that was first produced by Doebner & Gieskel in 1887, it was commercially introduced in 1908 as a treatment for gout.

Cinchophen was considered to be too dangerous for human use in most countries but has applications in veterinary medicine as a treatment for osteoarthritis in dogs.

Symptoms can include hyperventilation, hyperthermia (fever), gastrointestinal discomfort, diarrhoea, hives, vomiting, delirium, hepatitis,[8] jaundice, anorexia, convulsions, coma and death.

[7] Fatty degeneration of the heart and kidneys, necrosis of hepatic cells [9] in addition to yellow atrophy of the liver have been recorded in autopsy findings.

Osteoarthritic dogs treated with PLT have shown significant improvement of joint mobility, stiffness, lameness and weight bearing capacity.