There are multiple definitions:

1. oral immunotherapy(English)

   • refers to therapy against allergy
   • BE, SU
   • Immunology, Therapeutic approaches
   • https://doi.org…aci.2020.05.040

2. oral iron therapy(English)

   • CKD, IDA, IIT
   • Hematology, Therapeutic approaches
   • https://doi.org…3390/nu10091173