R84 drops provides antihistamine effect for inhalant allergy caused by pets, pollen, house dust, molds and mites. Inhalant allergy causes symptoms such as nasal congestion, sneezing, itchy or watery eyes runny nose, headache, sinus pressure. R84 has a direct hormonal effect against allergic symptoms, it opposes the activity of histamine receptors in the body through glandular stimulation.