<unk> , or dipyrone, is a painkiller, spasm reliever, and fever reliever that also has anti-inflammatory effects. It is most commonly given by mouth or by intravenous infusion. Although it is available over-the-counter in some countries, it is banned in others, due to its potential for adverse events, including agranulocytosis. A study by one of the manufacturers of the drug found the risk of agranulocytosis within the first week of treatment to be a mere 1.1 in a million, versus 5.92 in a million for diclofenac. It is in the ampyrone sulfonate family of medicines. It was patented in 1922 and was first used medically in Germany under the brandname "Novalgin". For many years, it was available over-the-counter in most countries, before its withdrawal due to severe adverse effects.<unk>  is marketed under various trade names.
Metamizole
Astemizole
Sodium azide
Eflornithine
Miproxifene phosphate
Fursultiamine
Mesocarb
Amifampridine