Medication Guide
A patient guide to Clonidine ER, a non-stimulant ADHD medication (alpha-2 agonist) — how it helps, what it treats, how to take it, and side effects to know about.
Clonidine extended-release is a non-stimulant ADHD medication that works on alpha-2 receptors to quiet excess arousal in the nervous system and support the brain's executive control circuits. It is especially useful for hyperactivity, impulsivity, tics, and sleep difficulties that accompany ADHD, and its sedating quality — a drawback for some — becomes an asset when taken at night by people who struggle to wind down. It can be used alone or combined with a stimulant.
Because it calms the body's fight-or-flight tone, clonidine also helps with stimulant rebound in the evening, ADHD-related insomnia, and hyperarousal symptoms more broadly. Benefits build over 2 to 4 weeks of consistent use. Improvement often appears first as easier bedtimes and fewer impulsive flare-ups, with steadier daytime behavior following. It is not a controlled substance.
Clonidine ER (Kapvay) is typically prescribed starting at 0.1 mg at bedtime, increased by 0.1 mg per week as needed to a usual range of 0.1 to 0.4 mg daily, often split morning and bedtime at higher doses. Take it at the same times every day, with or without food, and swallow extended-release tablets whole — do not crush, chew, or substitute immediate-release tablets milligram-for-milligram, as they are not interchangeable. Limit alcohol, which intensifies drowsiness and blood pressure lowering.
Clonidine is not a controlled substance, but it must never be stopped abruptly after regular use — sudden discontinuation can trigger rebound high blood pressure, racing heart, anxiety, and headache; your prescriber will taper it over several days to a week or more. If you miss a dose, skip it and resume your schedule without doubling. Rise slowly from sitting or lying down, especially early in treatment, and expect periodic blood pressure and heart rate monitoring.
The only way to know whether Clonidine ER — or any medication — fits your symptoms, history, and goals is a thorough evaluation with a qualified prescriber. Harpal Singh, PMHNP-BC provides comprehensive psychiatric evaluations and ongoing medication management by telehealth across California.
Good to know
They are close cousins: clonidine is more sedating and shorter-acting, making it especially useful for sleep and evening symptoms, while guanfacine is more selective for the prefrontal receptors tied to attention and is usually less sedating. Prescribers choose based on which symptom profile fits.
Its sedating effect at bedtime is often genuinely helpful for ADHD-related insomnia, and prescribers frequently take advantage of that by scheduling the dose at night. This use is common, though technically off-label for sleep itself.
Yes — Kapvay is FDA-approved as add-on therapy to stimulants for ADHD. The combination pairs daytime focus from the stimulant with reduced impulsivity, rebound, and better sleep from clonidine.
Your body adjusts to its blood-pressure-lowering effect, and abrupt withdrawal can cause a rebound surge in blood pressure and heart rate within a day or two. Always taper under your prescriber's direction, and do not let the prescription simply run out.
At ADHD doses most people tolerate it well, but lightheadedness on standing is possible, especially at first. Rise slowly, stay hydrated, and report fainting or persistent dizziness so your prescriber can adjust the dose.
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