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What should I know about metformin HCl before taking it?

Before taking metformin HCl, you should know how to recognize if your blood sugar is too low. Signs of low blood sugar include:

  • confusion
  • drowsiness
  • weakness
  • hunger
  • headache
  • sweating
  • coma
  • fainting
  • seizure
  • fast heartbeat

Make sure that you always have immediate access to some sugar source in case you develop any of these symptoms. While taking metformin HCl, it is possible to develop lactic acidosis. Lactic acidosis is a life-threatening condition. Symptoms are:

  • slow heart rate
  • muscle pain
  • fainting
  • weakness
  • increasing sleepiness
  • cold feeling
  • light-headedness
  • stomach pain

If you experience any of these symptoms, seek emergency medical attention. Before using metformin HCl, tell your doctor if you have any history of liver, kidney, or heart disease. These conditions may make you unable to take this medication. If you are to undergo any type of imaging test like an x-ray or CT scan in which a dye needs to be injected into your vein, you will likely need to stop taking this medication for a short period of time. Tell your doctor before the imaging test if you are using metformin HCl.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.