Abstract: A composition comprising a peptide salt having a pharmaceutically acceptable anion prepared by the method comprising the steps of: contacting a first peptide salt with a diluent to form a diluent solution; contacting the diluent solution containing the first peptide salt with a mixed bed ion exchanger, wherein the mixed bed ion exchanger has strongly acidic cations and strong anion exchangers; separating the mixed bed ion exchanger from the diluent solution; contacting the diluent solution with an acid having a pharmaceutically acceptable anion, thereby forming an acid addition salt of the peptide having the pharmaceutically acceptable anion; adding an adjuvant to the diluent solution; and separating the diluent from the diluent solution. The invention also relates to a method for treatment of benign prostate hyperplasia, myoma, or endometriosis with the composition.

Abstract: A method for producing peptide salts, including reacting an acid addition salt of a basic starting peptide in the presence of a diluent in a mixed bed ion exchanger, with a mixture of an acid and a basic ion exchanger during the formation of a free basic peptide, and then separating the ion exchanger and then the free basic peptide, with an inorganic or organic acid, and then forming the desired acid addition salt of the peptide, and removing the diluent.

Abstract: A method for producing peptide salts, including reacting an acid addition salt of a basic starting peptide in the presence of a diluent in a mixed bed ion exchanger, with a mixture of an acid and a basic ion exchanger during the formation of a free basic peptide, and then separating the ion exchanger and then the free basic peptide, with an inorganic or organic acid, and then forming the desired acid addition salt of the peptide, and removing the diluent.