Phenazone

Chemical structure of Phenazone

Phenazone, also known as antipyrine, is a non-opioid analgesic and antipyretic drug. It was first synthesized in 1887 by the German chemist Ludwig Knorr. Phenazone is used for its pain-relieving and fever-reducing properties.

Chemical Properties

Phenazone is a pyrazolone derivative with the chemical formula C₁₁H₁₂N₂O. It is a white crystalline powder that is soluble in water and alcohol. The compound is known for its rapid absorption and onset of action when administered orally.

Mechanism of Action

Phenazone works by inhibiting the enzyme cyclooxygenase (COX), which is involved in the synthesis of prostaglandins. Prostaglandins are mediators of inflammation and pain. By reducing the production of prostaglandins, phenazone alleviates pain and reduces fever.

Medical Uses

Phenazone is primarily used for the treatment of mild to moderate pain, such as headaches, toothaches, and muscle pain. It is also used to reduce fever in conditions like the common cold or influenza. In some cases, phenazone is combined with other analgesics or caffeine to enhance its effects.

Side Effects

Common side effects of phenazone include gastrointestinal disturbances such as nausea and vomiting. In rare cases, it can cause allergic reactions or blood disorders like agranulocytosis. Patients are advised to use phenazone under medical supervision, especially if they have a history of allergies or asthma.

History

Phenazone was one of the first synthetic drugs to be used as an analgesic and antipyretic. Its discovery marked a significant advancement in the development of non-opioid pain relievers. Over time, phenazone has been largely replaced by newer drugs with improved safety profiles, such as paracetamol and ibuprofen.

Related Pages

• Analgesic
• Antipyretic
• Nonsteroidal anti-inflammatory drug
• Prostaglandin