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

• thoroughfare
• thoroughgoing
• thoroughly
• thoroughness
• thoroughwort
• thorp
• Thorpe
• Thorshavn
• Thorstein Bunde Veblen
• Thorstein Veblen
• thortveitite
• those
• Thoth
• thou
• though
• thought
• thought experiment
• thought process
• thought transference
• thought-image
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• thought-reader
• thoughtful
• thoughtfully
• thoughtfulness