Sublingual Immunotherapy (SLIT)
Sublingual immunotherapy is given as drops under the tongue (SLIT). Unlike allergy medicines, which only treat allergy symptoms, SLIT addresses the underlying cause of allergies. The antigens used in drops are the same as in the injections and are prepared the same way. The difference is in the route of administration, a dropper that delivers the antigen under the tongue versus a syringe injecting the antigens into the skin.