Website for Odactra The FDA formally approved Odactra , the fourth new sublingual allergy tablet to be sold in the United States that works the same way allergy shots do... but instead is dissolved under the tongue at home instead of a shot in the arm in a medical office. Odactra is specifically used in the treatment of dust mite allergy. The other sublingual immunotherapy tablets currently available include: • Ragwitek used to treat ragweed. • Oralair and Grastek are two o…