A method of making a preparation having effect against allergic symptoms, more particularly a preparation which has proved to be effective for therapeutic and prophylactic relief or prevention of symptoms associated eith allergic rhinitis, asthmatic conditions and other allergic conditions, such as allergic conjunctivitis, urticaria, or insect or plant stings, and in which fresh, newly harvested plants of the species Artemisia or other davanon containing plants are boiled in water (1), whereby water steam and volatile essential oils are given off, said oils are collected (2), the residue green mass is heated in water to allow for hydrolysis of the chemical components (3) which are extracted with alcohol (4) and are mixed with the previously extracted essential oils. The alcohol extract could be exchanged for an extract of another plant (e.g. thyme or chamomile) containing spasmolytic or antiallergic components. The invention also relates to a preparation made according to the method.