Sentence examples for a side effect from inspiring English sources

"a side effect" is a correct and commonly used phrase in written English.
It refers to an unintended or secondary consequence or result of something. It can be used in various contexts, such as in medical descriptions of medication or treatment, in discussions of technology or scientific experiments, or in general discussions of unexpected consequences. Example: "The new medication had proven to be effective in treating the patient's illness, but it also caused some unwanted side effects such as drowsiness and nausea."