algifen algifen algifen is trademark of compositional analgesic drug based on mixture of metamizole, pitofenone and fenpiverinium. it was produced by zentiva in tablet-form, it was marketed in central and eastern europe. similar drug combinations are now marketed by teva under the name algifen neo (in the form of peroral drops). composition (per 1 ml): metamizole 500 mg, pitofenone 5 mg. it is frequently used during urinary infection to relieve pain.