Cinchophen (trade names Atophan, Quinophan, and Phenaquin) is an

analgesic An analgesic drug, also called simply an analgesic (American English), analgaesic (British English), pain reliever, or painkiller, is any member of the group of drugs used to achieve relief from pain (that is, analgesia or pain management). It ...

drug A drug is any chemical substance that causes a change in an organism's physiology or psychology when consumed. Drugs are typically distinguished from food and substances that provide nutritional support. Consumption of drugs can be via insuffla ...

that was first produced by Doebner & Gieskel in 1887, it was commercially introduced in 1908 as a treatment for

gout Gout ( ) is a form of inflammatory arthritis characterized by recurrent attacks of a red, tender, hot and swollen joint, caused by deposition of monosodium urate monohydrate crystals. Pain typically comes on rapidly, reaching maximal intensit ...

. This drug is still used, in combination with

Prednisolone Prednisolone is a steroid medication used to treat certain types of allergies, inflammatory conditions, autoimmune disorders, and cancers. Some of these conditions include adrenocortical insufficiency, high blood calcium, rheumatoid arthrit ...

, by

veterinarian A veterinarian (vet), also known as a veterinary surgeon or veterinary physician, is a medical professional who practices veterinary medicine. They manage a wide range of health conditions and injuries in non-human animals. Along with this, vet ...

s to treat arthritis in animals. It can be prepared starting from anilin, benzaldehyde and pyruvic acid in absolute ethanol. Use of this drug in humans ceased in the 1930s due to the discovery that cinchophen can cause serious

liver The liver is a major Organ (anatomy), organ only found in vertebrates which performs many essential biological functions such as detoxification of the organism, and the Protein biosynthesis, synthesis of proteins and biochemicals necessary for ...

damage. There is some evidence that it stimulates

C-Fos Protein c-Fos is a proto-oncogene that is the human homolog of the retroviral oncogene v-fos. It is encoded in humans by the ''FOS'' gene. It was first discovered in rat fibroblasts as the transforming gene of the FBJ MSV (Finkel–Biskis–Jinkin ...

History

Cinchophen was first introduced in 1908 as 'Atophan' and used for the treatment of gout and arthritis. It was efficacious at reducing the buildup of uric acid and became a popular medicine. Further studies in 1911 and 1912 were successful in isolating metabolites of cinchophen from human urine. During the 1920s, cases of severe adverse effects such as liver damage and cirrhosis had been clinically observed; the first case of jaundice was recorded in 1923 and the first fatality occurred in 1925. Approximately half of all patients experienced toxic effects and by 1932 there were 32 drugs available that contained cinchophen or its derivatives as their active ingredients, experiments were conducted to determine the drugs pharmacology but the mechanism of drug induced liver injury remained unclear. 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.

Available forms

Cinchophen can be administered orally in tablet form or intravenously in liquid form.

Toxicity and side-effects

Cinchophen toxicity may present 6 to 12 hours after administration. Symptoms can include hyperventilation, hyperthermia (fever), gastrointestinal discomfort, diarrhoea, hives, vomiting, delirium, hepatitis, jaundice, anorexia, convulsions, coma and death. Fatty degeneration of the heart and kidneys, necrosis of hepatic cells in addition to yellow atrophy of the liver have been recorded in autopsy findings.

Treatment

Cinchophen administration should be immediately ceased if symptoms occur. There is no cure for acute cinchophen poisoning but early diagnosis and symptomatic treatments may be effective. Calcium lactate may be used to treat hives and oral or intravenous glucose can relieve gastrointestinal symptoms. If glucose is given, insulin may be needed to protect the liver from further damage. Oral alkali treatments can combat acidosis and anti-emetics may be required to manage nausea and vomiting.

Veterinary medicine

Cinchophen is the main active ingredient in prednoleucotropin (PLT), a medication used in the treatment of osteoarthritis in dogs. PLT may produce analgesic and anti-pyretic effects at higher doses. Osteoarthritic dogs treated with PLT have shown significant improvement of joint mobility, stiffness, lameness and weight bearing capacity. When administered correctly, PLT has shown similar clinical efficacy to

phenylbutazone Phenylbutazone, often referred to as "bute", is a nonsteroidal anti-inflammatory drug (NSAID) for the short-term treatment of pain and fever in animals. In the United States and United Kingdom, it is no longer approved for human use (except in th ...

. The effects of PLT toxicity in dogs are similar to cinchophen toxicity in humans and include hepatotoxicity and gastric ulceration.

References

{{Antigout preparations Aromatic acids Analgesics Quinolines