off-target effect

https://doi.org/10.1351/goldbook.12697
Pharmacological action induced by any molecule at molecular/biological sites distinct from that for which it was designed.
Note: Such effects are dose-dependent and may be beneficial, adverse, or neutral.
Source:
PAC, 2013, 85, 1725. (Glossary of terms used in medicinal chemistry. Part II (IUPAC Recommendations 2013)) on page 1744 [Terms] [Paper]