For the seasonal treatment of short ragweed pollen induced allergic rhinitis in patients that have not adequately responded to, or tolerated, conventional pharmacotherapy. Notes: Treatment with short ragweed pollen allergen extract must be initiated by physicians with adequate training and experience in the treatment of respiratory allergic diseases. Treatment should be initiated at least twelve (12) weeks before the onset of ragweed pollen season and should only be continued until the end of the season.