Guanfacine for ADHD and high blood pressure: how it works
Guanfacine is an alpha-2 adrenergic agonist used to treat ADHD and hypertension. It improves focus and attention in adults and children, and lowers blood pressure by relaxing blood vessels.
What guanfacine does
Guanfacine is an alpha-2 adrenergic agonist, a type of medication that works by stimulating specific receptors in the brain and blood vessels. It has two main uses: treating attention-deficit/hyperactivity disorder (ADHD) and managing high blood pressure.
For ADHD, guanfacine helps improve focus, attention and impulse control in both adults and children. It reduces hyperactivity and inattention by increasing norepinephrine activity in the prefrontal cortex, the part of the brain responsible for executive function.
For hypertension, guanfacine lowers blood pressure by relaxing blood vessel walls and reducing the heart's workload. It's often prescribed when other blood pressure medications haven't worked well enough or have caused side effects.
How to take it
Guanfacine comes as an immediate-release tablet you take 1 to 3 times daily, or as an extended-release tablet (brand name Intuniv) taken once daily. Extended-release formulations are more commonly used for ADHD because they provide steadier medication levels throughout the day.
Dosages vary depending on your age, weight and the condition being treated. Your doctor will start you on a low dose and increase it gradually until you reach the right level for you.
Side effects and considerations
Common side effects include drowsiness, dizziness, headache, fatigue and dry mouth. These often improve as your body adjusts to the medication.
Guanfacine can lower blood pressure even in people without hypertension, so your doctor will monitor your blood pressure regularly. It can also cause rebound high blood pressure if you stop taking it suddenly, so your doctor will taper your dose gradually when discontinuing the medication.
Tell your doctor if you have heart problems, kidney disease or liver disease before taking guanfacine. It may not be suitable for you.
Telehealth and guanfacine
Many telehealth providers can prescribe guanfacine for ADHD after an initial evaluation and diagnosis. However, because this medication requires blood pressure monitoring and dose adjustments, your telehealth doctor may refer you to in-person care for blood pressure checks or complex cases.