Clonidine: uses, side effects & brands

Written & medically reviewed by Dr. Sanjay Anbu, MBBS · Last reviewed 5 November 2026

Clonidine lowers blood pressure and is also used for some other conditions. It belongs to the Blood-pressure medicine (extra) group. These lower blood pressure by additional mechanisms, often used when first-line drugs are not enough.

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Drug type — dosing is set by your doctor

Measure	Range
Drug class	Blood-pressure medicine (extra)
Type	Prescription
Dose	Individual — ask your doctor or pharmacist

What it is used for

High blood pressure
ADHD (special long-acting form in some countries)
Easing withdrawal symptoms from opioids
Menopausal hot flushes

Common brand names

India: Arkamin, Catapres
Worldwide: Catapres, Kapvay

Common side effects

Drowsiness
Dry mouth
Dizziness on standing
Constipation

Before taking it — precautions

Never stop suddenly, as blood pressure can rise dangerously
Tell your doctor about slow heartbeat or heart conduction problems
Alcohol and sleeping medicines add to drowsiness; tell your doctor about depression

When to see a doctor urgently

Severe headache, pounding heart or agitation after missed doses (urgent)
Very slow heartbeat or fainting (urgent)
Swelling of face or throat, or difficulty breathing (urgent)

Not a prescription — no dose shown. The right dose of clonidine depends on age, weight, kidney/liver function and the condition, so MedDroid does not show a dose here. Always get your dose from a doctor or pharmacist and the leaflet inside the pack. General educational information only.

Frequently asked questions

What happens if I stop suddenly?

Blood pressure can rebound to dangerous levels. Your doctor will reduce it slowly when needed.

Why is a blood-pressure medicine used for ADHD?

Clonidine acts on brain signals that affect attention and impulse control, and a special form is used for ADHD in some countries.

Can I drink alcohol?

Alcohol increases drowsiness and dizziness, so it is best avoided or limited.

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Sources & further reading

Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.