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Precautions and Warnings With Guanfacine ER

Alcohol should be avoided when taking guanfacine ER. Warnings and precautions with this ADHD medicine also apply to those who have low blood pressure, a history of fainting, or an irregular heart rhythm. This medication should not be used by anyone with an allergy to guanfacine ER or any of the ingredients used to make the drug.

What Should I Tell My Child's Healthcare Provider?

Before your child takes guanfacine ER (Intuniv™), tell the healthcare provider if your child has:
  • Low blood pressure (orthostatic hypotension)
  • An irregular heart rhythm (arrhythmia)
  • A slow heart rate (bradycardia)
  • A history of fainting
  • Any allergies, including to food, dyes, or preservatives.
Also, let your healthcare provider know if your child is:
  • Pregnant or thinking of becoming pregnant
  • Breastfeeding.
You should also be sure to tell your healthcare provider about all of the medicines your child takes, including prescription and nonprescription medications, vitamins, and herbal supplements.

Specific Warnings and Precautions With Guanfacine ER

Some precautions and warnings to be aware of with this medication include the following:
  • Guanfacine ER decreases both heart rate and blood pressure. For most children, these changes are too minor to cause any problems. However, this could cause problems for some children, especially those who already have low blood pressure or a slow heart rate.
The healthcare provider should check your child's blood pressure and heart rate before starting the medication, after any dose increases, and periodically thereafter.
  • Guanfacine ER often causes drowsiness. Make sure teens do not drive or operate heavy machinery until they know exactly how this medication will affect them.
  • People taking this drug should not drink alcoholic beverages.
  • Guanfacine ER is considered a pregnancy Category B medication. This means that it is probably safe for use during pregnancy, although the full risks are currently unknown. Be sure to talk with your child's healthcare provider about the risks and benefits of using this medication when pregnant (see Intuniv and Pregnancy).
  • It is unknown if guanfacine ER passes through breast milk. Therefore, if your child is breastfeeding or plans to start, be sure to talk with your healthcare provider before she starts taking this drug (see Intuniv and Breastfeeding for more information).
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