side effects vs a side effect

Both 'side effects' and 'a side effect' are correct, but they are used in different contexts. 'Side effects' is used when referring to multiple effects that occur as a result of a particular action or treatment. 'A side effect' is used when referring to a single effect that occurs alongside the main intended effect.

Last updated: March 31, 2024

side effects

This phrase is correct and commonly used in English when referring to multiple effects that occur as a result of a particular action or treatment.

Use 'side effects' when talking about multiple effects that occur as a result of a particular action or treatment. It is a plural form.

Examples:

The medication may have some side effects, such as dizziness and nausea.
One of the side effects of the treatment is increased appetite.

Alternatives:

adverse effects
unintended consequences
secondary effects
undesirable effects
concomitant effects

a side effect

This phrase is correct and commonly used in English when referring to a single effect that occurs alongside the main intended effect.

Use 'a side effect' when talking about a single effect that occurs alongside the main intended effect. It is a singular form.

Examples:

Fatigue is a common side effect of the medication.
The new software update had an unexpected side effect on system performance.

Alternatives:

an unintended consequence
an adverse effect
an unexpected outcome
an additional effect
an accompanying effect

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side effects vs a side effect

side effects

a side effect

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