Guanfacine and Methylphenidate interaction
Guanfacine and Methylphenidate: both prescribing labels describe an interaction that usually calls for monitoring, a dose change, or spacing the doses.
Usually manageable with monitoring or a dose change. Tell your pharmacist you take both.
What the FDA labels say
From the Guanfacine (Intuniv) label · effective 2025-06-23
In these cases, high-dosage guanfacine was discontinued; concomitant stimulant use was also reported, which may potentially increase hypertensive response upon abrupt discontinuation of guanfacine.
If abrupt discontinuation occurs (especially with concomitant stimulant use), patients should be closely followed for rebound hypertension.
From the Methylphenidate (Methylphenidate Extended-Release) label · effective 2026-06-16
Antihypertensive Drugs: Monitor blood pressure.
Adjust dosage of antihypertensive drug as needed.
Antihypertensive Drugs Clinical Impact Methylphenidate extended-release orally disintegrating tablets may decrease the effectiveness of drug used to treat hypertension [see Warnings and Precautions (5.3) ].
Intervention Monitor blood pressure and adjust the dosage of the antihypertensive drug as needed.
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.