For the seasonal treatment of grass pollen allergic rhinitis in patients that have not adequately responded to, or tolerated, conventional pharmacotherapy. Notes: - Treatment with grass pollen allergen extract must be initiated by physicians with adequate training and experience in the treatment of respiratory allergic diseases. - Treatment should be initiated four (4) months before the onset of pollen season and should only be continued until the end of the season. - Treatment should not be taken for more than three (3) consecutive years.