Guanfacine (Intuniv) for ADHD: the calm-down medication

product guide · 5 min read

Guanfacine confuses people because it isn't trying to do what stimulants do. Stimulants sharpen attention; guanfacine turns down the storm — impulsivity, emotional outbursts, the hair-trigger frustration that medication charts politely call "emotional dysregulation." For the right person, that's the half of ADHD that was actually breaking their life.

What it is

Guanfacine ER (brand Intuniv) is an alpha-2A adrenergic agonist — originally a blood-pressure medication — that strengthens signaling in the prefrontal cortex. It's not a controlled substance, works around the clock once established, and takes a few weeks to show its full effect. Doses run 1–4 mg (kids sometimes higher by weight), and the generic costs almost nothing (see costs).

Where it shines

• As an add-on to a stimulant — the most common use: the stimulant handles focus, guanfacine handles the impulsive/emotional layer and can smooth stimulant edginess.
• Kids with hyperactive-impulsive presentations, especially where tics or stimulant appetite loss are problems.
• Evening coverage — dosed at night, it also tends to help sleep rather than hurt it (a rare trait in ADHD medications — see the sleep guide).

The honest downsides

Sedation and fatigue are common early and usually fade over two to three weeks. Low blood pressure and dizziness are dose-dependent. And attention itself improves less than with stimulants — pure inattentive-type ADHD often finds it underwhelming as a solo act.

The one rule that isn't optional

Never stop guanfacine abruptly. It's a blood-pressure drug; sudden discontinuation can cause rebound hypertension, racing heart, and anxiety. Running out of refills is a medical problem, not an inconvenience — taper off under prescriber guidance, always. And note there is no dose conversion between guanfacine and any stimulant; the converter will tell you the same.

Educational content, not medical advice.