Digoxin Side Effects, How it Works, Upsides & Downsides

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Digoxin Side Effects. Severity: Major. You should check with your doctor immediately if any of these side effects occur when taking digoxin:

  • Dizziness
  • fainting
  • fast, pounding, or irregular heartbeat or pulse
  • slow heartbeat
  • black, tarry stools
  • bleeding gums
  • blood in the urine or stools
  • bloody vomit
  • pinpoint red spots on the skin
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