Astelin (Azelastine) may be described as an h1 – receptor antagonist, which relieves one’s symptoms by blocking the effects of Histamine. This medication may also be described as a white, crystalline and an almost odorless powder. Furthermore, Astelin (Azelastine) may also be described as a steroid – free powder which is known to have a bitter taste, does not contain pseudo ephedrine, is sparingly soluble in water, Methanol or Propylene Glycol and is slightly soluble in Ethanol, Octanol or Glycerin.