Now Id be careful about recommending singulair- drug has good and bad sides thats for sure. Most effective drugs I see on most folks ragweed is nasal steroids(Nasonex,Nasacort, Rhinocort, Veramyst) or nasal antihistamines(Patanase, Astepro). Problem with nasal antihist and oral antihist is sedation. Also could get on shots but thats a long run for a short seasonal slide for you-C.O.D. Jr. III