The present invention relates to a herbal extract obtainable by a method, comprising the following steps: (a) providing a plant material derived from Rosa sp., Urtica dioica and/or Tanacetum vulagare； (b) drying a plant material； (c) adding an organic solvent； (d) incubating the mixture of plant material and organic solvent； (e) obtaining the herbal extract； (f1) adding selenium and/or an organic or inorganic salt thereof； and/or (f2) adding urea； and (g) exposing the herbal extract to a pulsed electromagnetic field, for use in the treatment of Recurrent Respiratory Papillomatosis.
