副作用

1. Origins, structure, and basic meaning

• Structure: 副作用(ふくさよう) means an effect arising alongside the main effect, usually an undesirable one.
• Basic usage: It is used for side effects of medicines and for unexpected problems resulting from pursuing convenience.

2. Common pitfalls and similar expressions

• Expectation and occurrence
  • 予想される副作用 refers to side effects that are anticipated.
  • 副作用が生じた states that a side effect actually occurred.