D&C RED NO. 40 is an inactive component (color additive) of RYCLORA®, an antihistamine agent with anticholinergic (drying) and sedative side effects, which is effective for the symptomatic relief of perennial and seasonal allergic rhinitis, vasomotor rhinitis, allergic conjunctivitis due to inhalant allergens and foods, mild and uncomplicated allergic skin manifestations of urticaria and angioedema, dermographism, amelioration of allergic reactions to blood or plasma.