Nausea, dyspepsia, vomiting; urticaria & other skin eruptions, angioedema, rhinitis, severe or even fatal paroxysmal bronchospasm & dyspnea especially w/ asthma, chronic urticaria or chronic rhinitis. Increased bleeding time, decreased platelet adhesiveness & in large doses, hypoprothrombinemia; salicylism. Reye's syndrome (in childn).