Clonidine: uses, dosing, side effects & brands

Clonidine hydrochloride extended-release is a centrally acting alpha 2 -adrenergic agonist available as 0.1 mg extended-release tablets for oral administration. Each 0.1 mg tablet is equivalent to 0.087 mg of the free base. The inactive ingredients are colloidal silicon dioxide, hydroxyethyl cellulose, hydroxypropyl cellulose, magnesium stearate, microcrystalline cellulose, red iron oxide, sodium lauryl sulfate and titanium dioxide. The formulation is designed to delay the absorption of active drug in order to decrease peak to trough plasma concentration differences.

The FDA classifies clonidine as a central alpha-2 adrenergic agonist. These drugs activate alpha-2 receptors in the brainstem, which tells the nervous system to send out less norepinephrine and reduce sympathetic (fight-or-flight) signaling to the body. With less of this stimulation, blood vessels relax and heart rate slows, lowering blood pressure. If you are checking whether it is safe to combine with something else, the class is what matters — two drugs from the same class usually should not be stacked.

The label addresses alcohol directly. Under Drug Interactions it states clonidine may potentiate the CNS-depressive effects of alcohol, barbiturates, or other sedating drugs. The Information for Patients section adds that clonidine's sedative effect may be increased by concomitant use of alcohol, and cautions about driving or operating machinery. This is an additive CNS-depressant/sedation warning, not a disulfiram-like reaction. This is what clonidine's FDA label says; alcohol advice depends on your dose and health, so confirm with your pharmacist.

The label describes a clonidine withdrawal syndrome in its WARNINGS section. Sudden cessation has caused nervousness, agitation, headache, and tremor, accompanied or followed by a rapid rise in blood pressure and elevated plasma catecholamines; rare instances of hypertensive encephalopathy, cerebrovascular accidents, and death have been reported after abrupt withdrawal. Risk is greater at higher doses or with concurrent beta-blocker use. The label directs that patients not discontinue without consulting their physician and that the prescriber reduce the dose gradually (over 2 to 4 days) to avoid withdrawal; if a beta-blocker is also being stopped, it should be withdrawn several days before clonidine. This appears in the WARNINGS section, not a boxed warning. Do not stop clonidine on your own — any change is a prescriber-managed decision.

The elimination half-life of clonidine is about 12 to 16 hours — that is how long the body takes to clear half of a dose. The half-life gets much longer when the kidneys are not working well — up to about 41 hours in people with severe kidney impairment. Half-life is not the same as how long a drug test can detect the drug, and it varies with age, kidney and liver function.

It depends on the medicine. We check it against the FDA labels rather than guessing: our interaction checker searches each drug's own label for the other and quotes what it says, naming the section it came from. Run clonidine against whatever else you take — and remember that a label not naming a drug is not the same as that combination being safe.

We track 11 clonidine-containing products in the U.S.: Catapres, Clonidine Hydrochloride, Onyda XR, Javadin, Duraclon, Catapres-Tts-1, Catapres-Tts-2 and Catapres-Tts-3, and 3 more. They are the same active ingredient; they differ in form, manufacturer, price and FDA recall record.

Across the brands we track, clonidine is currently marketed as tablet, injectable, tablet, extended release, suspension, extended release, solution and patch, per the FDA's National Drug Code Directory. Each form is dosed differently — follow the label for the exact product you were prescribed.

Yes. Our catalog lists 1 generic clonidine product alongside the brand versions. A generic has the same active ingredient and must meet the FDA's bioequivalence standard; it usually costs less. Ask your pharmacist which one your plan covers.

The FDA's Enforcement database lists 3 recall records whose product description mentions clonidine. The most recent: Clonidine Transdermal System (Mar 19, 2026). A recall applies to specific lots, not to the drug as a whole — check the record for the affected lot numbers.

Alcohol: the FDA label flags alcohol as something to be careful with — see the alcohol section above for what it actually says. This is what the FDA label and our cited sources say — it is not a complete list. Your pharmacist can check your own combination.

Clonidine is FDA-approved for two things. As Catapres (and generic immediate-release tablets/patches), it treats high blood pressure — MedlinePlus states it "is used alone or in combination with other medications to treat high blood pressure." Separately, the extended-release form (Kapvay) is FDA-approved to treat ADHD in children and adolescents (ages 6–17), used on its own or added to a stimulant. Beyond these approvals, clonidine is widely used OFF-LABEL (legal and often evidence-based, but not FDA-approved for these): to ease opioid and alcohol withdrawal, for menopausal hot flashes, for anxiety, and for tics/Tourette syndrome. MedlinePlus lists menopausal hot flashes and alcohol/opiate withdrawal among its uses, and StatPearls notes clonidine "is used for withdrawal symptoms from opioids, benzodiazepines, and alcohol, and anxiety." This is not a complete list — clonidine has additional, less common uses your prescriber can explain. Which use applies to you should be decided with your prescriber.

Yes. The extended-release form of clonidine, sold as Kapvay, is FDA-approved for ADHD in children and adolescents (ages 6–17) — either on its own or as an add-on to a stimulant medication, which is helpful when a stimulant alone doesn't fully control symptoms. It is a non-stimulant option and is often chosen when hyperactivity, impulsivity, sleep problems, or tics are prominent. Note the distinction: only the extended-release formulation carries the ADHD approval. The immediate-release clonidine (Catapres) is FDA-approved for blood pressure, so using it for ADHD is off-label. Because clonidine lowers blood pressure and heart rate and shouldn't be stopped abruptly, ADHD treatment with it should always be started, dosed, and adjusted by a prescriber.