1. A secondary and usually adverse effect of a drug or therapy
   "severe headaches are one of the side effects of the drug" 
2. Any adverse and unwanted secondary effect
   - fallout

Derived forms: side effects

Type of: consequence, effect, event, issue, outcome, result, upshot

Encyclopedia: Side effect

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• bicarbonate of soda
• bicaudate
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• bichloride
• bichloride of mercury
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• bickerer
• bickering