Anodyne does not heal you back to full hp, instead you have a section of the health bar showing how much it will heal.
In some scenarios, this regular form of Anodyne will be preferred over High Anodyne on support Pawns. Pawns will never cast the basic version when the higher version is available, and High Anodyne has a longer cast time. This can lead to situations where you need to be healed, and a Pawn keeps getting interrupted during High Anodyne when a pawn would otherwise have already casted regular Anodyne. Players are advised to think carefully before upgrading Anodyne on pawns, as once upgraded, this choice cannot be reversed.