Clonidine (Catapres, Kapvay)

Clonidine is pronounced “KLON-ih-deen” (rhymes with “on-a-teen”). The brand name Catapres is pronounced “KAT-uh-press,” and Kapvay is pronounced “KAP-vay.” Note, Kapvay extended release tablets are discontinued.

Clonidine is FDA-approved to treat ADHD in children (extended release formulation) and high blood pressure. It is also prescribed off-label to help manage opioid and alcohol withdrawal, agitation, anxiety or panic as an add-on treatment, trauma-related flashbacks in PTSD, tics, restless leg syndrome, and difficulty sleeping.

“HCl” stands for hydrochloride, and clonidine HCl is simply the full chemical name for clonidine. Hydrochloride is a salt form used to make the medication stable and easy for the body to absorb. Clonidine and clonidine hydrochloride refer to the same active medication, so the two names are used interchangeably on prescriptions and packaging.

Clonidine calms an overactive “fight or flight” stress response in the body. Norepinephrine and epinephrine are chemicals that ramp up alertness, heart rate, and blood pressure, and may have other effects, depending on where in the body it is circulating; by suppressing its activity, clonidine can improve hyperactivity, impulsivity, attention, restlessness, physical symptoms of anxiety or withdrawal, and blood pressure.

Clinically, clonidine is a central alpha-2 adrenergic agonist. It stimulates alpha-2 receptors in the brainstem to reduce sympathetic (“fight or flight”) outflow, and acts on the prefrontal cortex to influence norepinephrine signaling involved in attention and impulse control.

No. Clonidine is not a controlled substance. It is a prescription-only medication, meaning it requires a clinician’s prescription to obtain, but it is not classified as a controlled substance by the Drug Enforcement Administration (DEA).

No. Clonidine is not a benzodiazepine, and it is not considered addictive or habit-forming when taken as prescribed. However, clonidine should not be stopped suddenly. Stopping abruptly can cause rebound high blood pressure, a rapid heartbeat, anxiety, and agitation. Always follow your psychiatric provider’s directions on when to stop taking medications or change dosages.

No. Clonidine is not a beta blocker. It is a centrally acting alpha-2 adrenergic agonist. Both drug classes can lower blood pressure and heart rate, but they act on different receptors and work in different ways.

Common side effects of clonidine include:

• Drowsiness or sedation — often strongest early in treatment and may ease over time.
• Dry mouth — sipping water or sugar-free gum may help.
• Dizziness or lightheadedness — rise slowly from sitting or lying down.
• Low blood pressure and slowed heart rate — your clinician may monitor these.
• Constipation, fatigue, or irritability — tell your clinician if these persist.

Serious side effects — contact your clinician promptly if you experience:

• Fainting, very slow heartbeat, or severe dizziness
• Rebound high blood pressure after a missed or stopped dose
• Mood changes or depression

For some individuals, side effects improve after days, weeks, months, or not at all. Contact your clinician if symptoms are severe or persistent.

Yes. Drowsiness is one of the most common effects of clonidine, especially when starting treatment or after a dose increase. Because drowsiness can occur, clonidine is sometimes prescribed off-label to help with sleep. Do not drive or operate machinery until you know how clonidine affects you.

Weight gain is not a common side effect of clonidine. Some individuals notice mild fluid retention or increased appetite, but significant weight change is uncommon. Speak with your prescribing clinician if weight changes are a concern.

Yes. Clonidine reduces sympathetic nervous system activity, which lowers both blood pressure and heart rate. This is why it is used to treat high blood pressure, and why your clinician may check these values during treatment.

For blood pressure, clonidine can begin working within 30 to 60 minutes of an oral dose, with the largest effect in about 2 to 4 hours. For ADHD, extended-release formulations are usually taken twice daily, and improvements in attention and behavior may build gradually over one to several weeks. Regular follow-ups help your clinician monitor your response.

Immediate-release clonidine typically lasts several hours, which is why it is often taken multiple times per day, while extended-release forms last longer. Clonidine is generally cleared from the body within about one to two days, though this varies by individual, dose, and formulation.

Onyda XR is a brand-name, extended-release liquid form of clonidine approved to treat ADHD in children. As a once-daily oral suspension, it can be an option for children who have difficulty swallowing tablets. Like other clonidine products, it works on alpha-2 receptors to help improve attention and impulse control.

Yes. Clonidine is available as a transdermal patch, sold under the brand name Catapres-TTS, that is applied to the skin and typically replaced once a week. The patch delivers a steady dose over time and is mainly used for high blood pressure. Clonidine also comes as an intravenous solution (brand name Duraclon) used in specific clinical settings for pain management. Your clinician will recommend the formulation that best fits your needs.

Clonidine is sometimes prescribed off-label as an add-on treatment for anxiety or panic symptoms, particularly physical symptoms like a racing heart. It is not a first-line anxiety medication and is not FDA-approved for anxiety. A clinician can help determine whether it fits your treatment plan.

Clonidine and guanfacine are both alpha-2 adrenergic agonists used for ADHD and high blood pressure. Guanfacine is more selective for a specific alpha-2 receptor subtype, tends to be less sedating, and lasts longer in the body, while clonidine is often more sedating and may be preferred when sleep support is a goal. The choice depends on your symptoms, side-effect profile, and treatment goals.

Clonidine may be prescribed off-label to help ease physical symptoms of opioid and alcohol withdrawal, such as sweating, agitation, rapid heartbeat, and anxiety, by calming the overactive stress response that occurs during withdrawal. It is used under close medical supervision as part of a broader treatment plan.

Clonidine and Adderall (amphetamine/dextroamphetamine) are sometimes prescribed together for ADHD, and the combination can be appropriate under a clinician’s guidance. Because both affect heart rate and blood pressure, this combination should only be used when prescribed and monitored. Consult your prescribing clinician before starting, stopping, or combining any medications or substances with clonidine.

Yes. A clonidine overdose is a medical emergency and can cause dangerously slow heart rate, very low blood pressure, extreme drowsiness, and slowed breathing. Keep clonidine out of the reach of children, and always take it exactly as prescribed. If an overdose is suspected, seek emergency care immediately. Always take clonidine as prescribed by your clinician.

he cost of clonidine varies depending on whether you receive the generic or a brand-name version (such as Catapres), the formulation, and your pharmacy.

• Generic clonidine: As of publication date, a 100-tablet supply of the 0.05 mg tablet starts around $115.83, and prices vary by strength and pharmacy.
• Brand-name Catapres: As of publication date, 0.1 mg oral tablets start around $293.02 for 100 tablets.

If you have insurance, your out-of-pocket cost will depend on your supporting diagnosis and plan type (e.g., commercial, Medicare, Medicaid) and may include a copay or coinsurance.

Yes. Clonidine is FDA-approved to treat ADHD in children, both on its own and alongside stimulant medications, and the extended-release form is approved for this use. Clonidine should only be taken as and when prescribed by an appropriately licensed medical professional.