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Phenylephrine HC is a decongestant used to treat nasal and sinus congestion and levothyroxine is a synthetic thyroid hormone used to treat hypothyroidism. Both medications can be used to treat different conditions but should not be taken together due to potential drug interactions.

Possible adverse reactions from combining phenylephrine HC and levothyroxine include:

  • Increased blood pressure
  • Increased heart rate
  • Dizziness
  • Headache
  • Nausea

To avoid these potential drug interactions it is important to talk to your doctor or pharmacist before taking any medications. They can help you decide which medications are safe to take together and which you should avoid.

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Vergie Moen

Lvl 10
2y ago

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