This combination medication is used to temporarily relieve symptoms caused by the common cold, flu, allergies, or other breathing illnesses (such as sinusitis, bronchitis). An elixir is a clear, sweet-flavored liquid used for medical purposes, to be taken orally and intended to cure one's illness. How does this medication work? What will it do for me? Oxtriphylline belongs to the. Uses of Diphenhydramine Elixir, Liquid, and Syrup: · It is used to relieve coughing. Dimaphen Elixir is a combination medicine used to treat symptoms of the common cold or seasonal allergies, including sneezing, runny or.