chronic effect

antonym: acute effect
synonym: long-term effect
https://doi.org/10.1351/goldbook.14524
Consequence that develops slowly and (or) has a long-lasting course: may be applied to an effect which develops rapidly and is long lasting.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 856 [Terms] [Paper]