buccal tablet

https://doi.org/10.1351/goldbook.15157
Usually a small, flat, and soft tablet, which is designed to be placed inside the cheek to be directly absorbed through the mucosa for systemic effect.
Source:
PAC, 2009, 81, 971. (Glossary of terms related to pharmaceutics (IUPAC Recommendations 2009)) on page 978 [Terms] [Paper]