Metamizol

Also known as dipyrone, Novaldin, Dipyrone, Diprofarn, Noraminophenazone methanesulfonate sodium salt, Noraminophenazone sodium mesylate, Analgin (sodium salt)

thumb|Oral solution bottle of dypirone in its packaging (Portuguese lettering) Metamizole or dipyrone (informally known as the "Mexican aspirin") is a painkiller, spasm reliever, and fever reliever drug. It is most commonly given by mouth or by intravenous infusion. It belongs to the ampyrone sulfonate family of medicines and was patented in 1922. Metamizole is marketed under various trade names. It was first used medically in Germany under the brand name "Novalgin", later becoming widely known in Slavic nations and India under the name "Analgin".