Definition of side effect in English:

side effect

Line breaks: side ef¦fect

noun

  • A secondary, typically undesirable effect of a drug or medical treatment: many anti-cancer drugs now in use have toxic side effects
    More example sentences
    • Most of those who had had a stroke were aware of their own drug treatment and were concerned about the side effect of drugs.
    • Tell your doctor if you have had a particular side effect from a pain medication in the past.
    • If priapism has occurred as a side effect of medication then a different medication can usually be prescribed.

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