Guanfacine — Uses, Dosage, Side Effects & Safety

Drug class: Selective alpha-2A adrenergic receptor agonist

Overview

Guanfacine is a prescription medication used primarily to treat attention deficit hyperactivity disorder (ADHD) in children and adolescents. It may also be prescribed for high blood pressure (hypertension), though this is less common today. Guanfacine works by affecting certain receptors in the brain to help improve attention, impulse control, and hyperactivity. This medication is not a stimulant, making it a useful alternative for patients who cannot tolerate stimulant medications. It is usually taken once daily, and it is important to follow your healthcare provider’s instructions closely. Patients should not stop taking guanfacine suddenly without consulting their doctor, as this can cause withdrawal symptoms or spikes in blood pressure. Key points for patients: Guanfacine may cause drowsiness, especially when starting treatment. It is important to avoid activities that require full alertness until you know how the medication affects you. Always inform your healthcare provider about all other medications you are taking to avoid potential interactions.

Therapeutic uses

• Attention deficit hyperactivity disorder (ADHD)
• Hypertension

Common side effects

• Drowsiness
• Dizziness
• Fatigue
• Nausea
• Abdominal pain
• Dry mouth
• Bradycardia
• Hypotension

Frequently Asked Questions about Guanfacine

What is guanfacine used for?

Guanfacine is mainly used to treat ADHD in children and adolescents. It may also be prescribed for high blood pressure, though this is less common.

How long does it take for guanfacine to work?

Some improvement in ADHD symptoms may be seen within 1–2 weeks, but full effects can take several weeks. Always follow your doctor’s instructions.

Can guanfacine be stopped abruptly?

No. Stopping guanfacine suddenly can cause withdrawal symptoms or spikes in blood pressure. Your doctor will guide you on how to taper the dose safely.

Is guanfacine a stimulant?

No, guanfacine is not a stimulant. It works differently from stimulant ADHD medications and is often used when stimulants are not suitable.

What should I do if I miss a dose?

Take the missed dose as soon as you remember, unless it is almost time for your next dose. Do not double up doses.

Are there foods or drinks I should avoid?

Avoid alcohol and grapefruit juice, as they may increase side effects or affect how the medication works.

Can guanfacine cause sleep problems?

Guanfacine may cause drowsiness in some people, but it can also cause sleep disturbances in others. Talk to your doctor if you have trouble sleeping.

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.