Treatment of seasonal allergic rhinitis using homeopathic preparation of common allergens in the southwest region of the US: a randomized, controlled clinical trial.

Background: Studies using homeopathy have reported beneficial effects from treating allergy-related conditions.

Objective: To investigate the effects of a homeopathic drug prepared from common allergens (tree, grass, weed species) specific to the Southwest region of the US.

Methods: A 4-week, double-blind clinical trial comparing homeopathic preparations with placebo was conducted in the Phoenix metropolitan area during the regional allergy season from February to May.