Definition of side effect in English:

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side effect

Pronunciation: /ˈsīd əˌfekt/

noun

A secondary, typically undesirable effect of a drug or medical treatment: many anticancer 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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