medicationPrescription only (US)Clonidine is an approved medicine; the cited literature reports trial outcomes, not dosing advice.
ClonidineBenefits, Dosage & Interactions
Also known as: Catapres
Clonidine is a prescription medication primarily used to treat high blood pressure (hypertension). It is also prescribed for attention deficit hyperactivity disorder (ADHD), certain pain conditions, and withdrawal symptoms from opioids or alcohol. It is typically taken in the evening.
How much Clonidine do people take?
Not stated here. The cited trials each used their own protocol amounts, and Clonidine is dosed by a prescriber or the approved product label — DoseRoutine records what you were told to take, it does not suggest an amount. Route reported: Oral (the route studied in the cited trials). Frequency reported: Set by the prescription or approved label, not by this record. These are amounts documented in the cited studies and labels for Clonidine — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
See the full reported protocol and its sourcesResearched by DoseRoutine Research TeamReviewed for accuracy by Nicholas Alexander, RSE, SO, PMPLast updated Educational reference only — not medical advice. Always confirm dosing and safety decisions with a licensed clinician.
Evidence: Strong — 1399 human randomized trials and regulatory approval on file.
Evidence strengthStrong · 4/4
PreclinicalStrong human evidence
1399 human randomized trials and regulatory approval on file.
Plasma half-life
12–16 h
Typical timing
in the evening
Default unit
mcg
What published protocols report
Ranges documented in the literature, shown for reference. DoseRoutine does not recommend an amount — your prescriber or the product label sets the dose.
Reported for Clonidine in the cited sources. Published ranges are not dosing advice.
References & evidence
Documents the Clonidine entry is written from. Each number matches an inline marker above.
- [1]Intraoperative Clonidine in Spine Surgery: A Randomised Controlled TrialBirkebæk S, Juul N, Rasmussen MM, et al. · Acta Anaesthesiol Scand · 2025 · Peer-reviewed · PMID 40331364
- [2]Clonidine for sedation in the critically ill: a systematic review and meta-analysisWang JG, Belley-Coté E, Burry L, et al. · Crit Care · 2017 · Peer-reviewed · PMID 28330506
References & Evidence
Sources on this page that document Clonidine dosing, timing and safety.
- [1]U.S. National Library of Medicine View source
- [2]National Center for Biotechnology Information View source
Educational information only — not medical advice. Dose ranges vary by person, indication and prescriber.
What is Clonidine?Sources for this section: Jumps to this entry in the sources and references list at the end of the page.
Clonidine is a prescription medication primarily used to treat high blood pressure (hypertension). It is also prescribed for attention deficit hyperactivity disorder (ADHD), certain pain conditions, and withdrawal symptoms from opioids or alcohol. Available in oral tablet and transdermal patch forms, clonidine works by affecting specific receptors in the brain to reduce heart rate and relax blood vessels.
Clonidine is often prescribed as a standalone treatment or in combination with other medications. Its use requires professional medical supervision because of potential side effects and interactions. The dosage and form of administration depend on the condition being treated and individual patient factors. It is essential to adhere strictly to a healthcare provider's instructions when using clonidine.
What does the research say about Clonidine?
Tap a section to expand.
Clonidine primarily acts as an alpha-2 adrenergic agonist. This means it stimulates alpha-2 adrenergic receptors in the brain, particularly in the brainstem. These receptors play a crucial role in regulating the sympathetic nervous system, which controls "fight or flight" responses like heart rate and blood pressure.
When clonidine activates these alpha-2 receptors, it reduces the outflow of sympathetic nerve impulses from the central nervous system. This leads to a decrease in peripheral vascular resistance, heart rate, and blood pressure. For hypertension, this mechanism effectively lowers blood pressure. In conditions like ADHD, clonidine's action on alpha-2 receptors in specific brain regions is thought to improve attention and reduce impulsivity. For withdrawal symptoms, it helps to alleviate the overactivity of the sympathetic nervous system caused by the absence of the substance, reducing symptoms like anxiety, tremors, and sweating (MedlinePlus, DrugBank).
Source for this section: Sources for How does Clonidine work?: Jumps to this entry in the sources and references list at the end of the page.
Clonidine offers several therapeutic benefits, primarily in cardiovascular and neurological conditions:
* **High Blood Pressure (Hypertension):** Clonidine is effective in lowering elevated blood pressure, reducing the risk of heart attack, stroke, and kidney problems. It can be used alone or in combination with other antihypertensive agents (Mayo Clinic).
* **Attention Deficit Hyperactivity Disorder (ADHD):** In some children and adolescents, clonidine can help improve attention, reduce impulsivity, and manage hyperactivity, particularly when other stimulant medications are not tolerated or are insufficient. An extended-release formulation is specifically approved for ADHD (NIH ODS).
* **Opioid Withdrawal Symptoms:** Clonidine is used off-label to help manage the physical symptoms associated with opioid withdrawal, such as anxiety, sweating, muscle cramps, and insomnia. It does not address the craving for opioids but can significantly alleviate the discomfort of withdrawal (Substance Abuse and Mental Health Services Administration (SAMHSA), via NIH).
* **Alcohol Withdrawal Syndrome:** Similar to opioid withdrawal, clonidine can help mitigate the autonomic hyperactivity seen in alcohol withdrawal, reducing symptoms like tremors, agitation, and elevated blood pressure.
* **Pain Management:** Clonidine can be used as an adjuvant in chronic pain management, particularly neuropathic pain, by enhancing the analgesic effects of other medications or directly modulating pain signals (DrugBank).
* **Vasomotor Symptoms of Menopause:** In some cases, clonidine has been used off-label to alleviate hot flashes experienced during menopause (Cochrane).
These benefits underscore clonidine's versatility, but its use is always determined by a healthcare professional based on individual patient needs and conditions.
Numerous studies and clinical guidelines support the use of clonidine for its various indications:
* **Hypertension:** Clonidine's efficacy in treating hypertension is well-established and supported by clinical trials. It has been a standard treatment for decades, often included in clinical guidelines for blood pressure management (NIH ODS, MedlinePlus).
* **ADHD:** The extended-release formulation of clonidine (Kapvay) has received FDA approval specifically for the treatment of ADHD in children and adolescents, based on data from placebo-controlled trials demonstrating significant improvements in ADHD symptoms (FDA Label).
* **Opioid Withdrawal:** While often an 'off-label' use, clonidine is widely recognized and used in clinical practice for managing opioid withdrawal symptoms. Its effectiveness in reducing autonomic symptoms experienced during withdrawal is supported by clinical observations and some controlled studies, though it does not address cravings (NIH ODS, SAMHSA guidelines).
* **Alcohol Withdrawal:** Evidence for clonidine's role in alcohol withdrawal is similarly strong, with many clinicians employing it to manage the autonomic overactivity associated with detoxification programs.
* **Pain:** Research supports clonidine's use as an adjuvant analgesic, particularly for neuropathic pain and in regional anesthesia, where it can prolong the effects of local anesthetics and reduce opioid requirements (MedlinePlus, DrugBank).
* **Vasomotor Symptoms:** A Cochrane review has evaluated clonidine for hot flashes in menopausal women, concluding it may offer some benefit, though often less effective than hormone therapy (Cochrane).
Clonidine can cause a range of side effects, some common and mild, others more serious. It's crucial to report any persistent or severe side effects to a healthcare provider.
Common side effects often diminish with continued use:
* Dry mouth
* Drowsiness or sedation
* Dizziness
* Lightheadedness
* Constipation
* Nausea
* Fatigue
* Headache
More serious, but less common, side effects include:
* Significant drop in blood pressure (hypotension), especially when standing up quickly (orthostatic hypotension)
* Slow heart rate (bradycardia)
* Heart rhythm disturbances
* Severe mood changes or depression
* Hallucinations
* Difficulty sleeping
* Skin rash or irritation (particularly with the transdermal patch)
* Swelling of the hands or feet (edema)
* Rebound hypertension if discontinued abruptly
This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Source for this section: Sources for What are the side effects of Clonidine?: Jumps to this entry in the sources and references list at the end of the page.
Several warnings are associated with clonidine use to ensure patient safety:
* **Abrupt Discontinuation:** Never stop taking clonidine suddenly. Abrupt cessation, especially after prolonged use or high doses, can lead to a rapid and dangerous increase in blood pressure (rebound hypertension), along with symptoms like nervousness, anxiety, headache, and tremors. Dosing must be gradually reduced under medical supervision (NIH ODS).
* **Cardiovascular Conditions:** Use with caution in patients with severe coronary insufficiency, recent myocardial infarction, cerebrovascular disease, or chronic renal failure, as clonidine can exacerbate these conditions (MedlinePlus).
* **Sedation:** Clonidine can cause drowsiness and sedation. Patients should be advised against operating machinery or driving until they know how clonidine affects them. Alcohol and other central nervous system depressants can enhance this sedative effect.
* **Orthostatic Hypotension:** Patients, especially the elderly, should be warned about the risk of dizziness or fainting due to a sudden drop in blood pressure when standing up. This can increase the risk of falls.
* **Allergic Reactions:** Though rare, severe allergic reactions (e.g., rash, hives, swelling of the face/mouth, difficulty breathing) are possible.
* **Patch Application:** For transdermal patches, skin irritation or localized allergic reactions can occur at the application site. Patches should not be cut.
This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Source for this section: Sources for Who should avoid Clonidine?: Jumps to this entry in the sources and references list at the end of the page.
Clonidine is generally contraindicated in individuals with a known hypersensitivity to clonidine or any component of the formulation. Caution is advised, and it may be contraindicated in certain severe pre-existing medical conditions:
* **Severe Bradyarrhythmia:** In conditions involving severely slow heart rates, especially those without a pacemaker, clonidine's bradycardic effect could be dangerous.
* **Pheochromocytoma:** Clonidine is generally not effective and can be detrimental in patients with hypertension due to pheochromocytoma (a tumor of the adrenal gland).
Specific formulations (e.g., epidural clonidine) have additional contraindications, such as anticoagulant therapy, bleeding diatheses, or infection at the injection site.
This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Source for this section: Sources for When should Clonidine not be taken?: Jumps to this entry in the sources and references list at the end of the page.
Clonidine can interact with various other medications, potentially altering its effects or increasing the risk of adverse reactions. Discuss all current medications, including over-the-counter drugs, supplements, and herbal products, with a healthcare provider.
* **Central Nervous System (CNS) Depressants:** Combining clonidine with alcohol, sedatives, hypnotics (e.g., benzodiazepines like diazepam, lorazepam), opioids, or other CNS depressants can significantly enhance sedation and drowsiness, leading to excessive sleepiness, impaired coordination, and slowed breathing (NIH ODS).
* **Beta-Blockers and Calcium Channel Blockers:** Co-administration with other blood pressure-lowering medications, particularly beta-blockers (e.g., propranolol, metoprolol) or calcium channel blockers (e.g., verapamil, diltiazem), can lead to an additive decrease in heart rate and blood pressure, potentially causing severe bradycardia or hypotension. Abrupt withdrawal of a beta-blocker while on clonidine can also exacerbate rebound hypertension (MedlinePlus).
* **Tricyclic Antidepressants (TCAs):** TCAs (e.g., amitriptyline, imipramine) may reduce the antihypertensive effect of clonidine by blocking its alpha-2 adrenergic receptor effects. This may require an adjustment in clonidine dosage.
* **Diuretics:** While often used together to manage hypertension, concomitant use with diuretics may increase the risk of orthostatic hypotension.
* **Alpha-1 Adrenergic Agonists:** Drugs that stimulate alpha-1 receptors can oppose clonidine's blood pressure-lowering effects.
This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Source for this section: Sources for What should you not mix with Clonidine?: Jumps to this entry in the sources and references list at the end of the page.
The typical timing for clonidine administration depends on the specific formulation and condition being treated, but it is often taken at bedtime to mitigate daytime drowsiness. For hypertension, it can be prescribed two or three times a day. For ADHD, the extended-release formulation might be given once daily, often in the evening. Transdermal patches are typically applied once every seven days. Clonidine can be taken with or without food. User-directed doses must be set by a licensed clinician.
Source for this section: Sources for When should you take Clonidine?: Jumps to this entry in the sources and references list at the end of the page.
Put it into practice
Reading about Clonidine is the first step — DoseRoutine helps you act on it. These free tools turn what you just learned into a routine.
What interacts with Clonidine?
Frequently asked questions about Clonidine
Clonidine is primarily used to treat high blood pressure (hypertension). It is also used for ADHD, managing withdrawal symptoms from opioids or alcohol, and certain pain conditions.
No, you should never stop taking clonidine suddenly. Abrupt discontinuation can lead to a dangerous and rapid increase in blood pressure (rebound hypertension) along with other withdrawal symptoms. Your dosage must be gradually reduced under the supervision of a healthcare provider.
Common side effects include dry mouth, drowsiness, dizziness, lightheadedness, constipation, and fatigue. These often lessen as your body adjusts to the medication.
Clonidine works by stimulating alpha-2 adrenergic receptors in the brain. This reduces the activity of the sympathetic nervous system, leading to a decrease in heart rate, relaxation of blood vessels, and lower blood pressure. In ADHD, it helps improve attention and reduce impulsivity.
No, clonidine is not classified as a controlled substance in the United States.
As a medication, Clonidine can overlap with other supplements, prescription medicines, hormones and peptides. Because Clonidine is usually taken in the evening, most avoidable conflicts come from what else lands in that same window. With a reported plasma half-life near 12 hours, separating doses can change the picture as much as removing one. Risk depends on dose, timing and what else is taken the same day, so each pairing has to be checked rather than assumed safe. The free checker at https://doseroutine.com/interaction-checker covers Clonidine with no sign-up.
Clonidine is typically taken in the evening. The reported plasma half-life is about 12 hours, which is what drives how often it is redosed. Amounts for this medication vary by protocol, formulation and individual response, so follow the dose your clinician or the product label specifies.
Whether Clonidine fits alongside testosterone replacement therapy depends on the protocol — dose, ester and ancillaries such as HCG or anastrozole — and on current bloodwork. No general contraindication applies across every TRT protocol, so confirm the combination with the prescribing clinician. See the free TRT interaction reference: https://doseroutine.com/trt-supplement-interactions
"Peptides" is not one category — healing peptides, GLP-1 agonists, growth-hormone secretagogues and melanocortins each behave differently next to Clonidine. Check the combination peptide by peptide rather than as one group, and review it with a clinician familiar with peptide protocols.
With a plasma half-life near 12 hours, once-daily dosing is the usual pattern for Clonidine. It is typically taken in the evening. Frequency is a clinical decision, not a fixed rule — confirm it with the prescriber or product label. Comparison of apps that keep a schedule like this: https://doseroutine.com/best-dose-tracking-apps
With a plasma half-life near 12 hours, a single missed dose of Clonidine usually has a smaller effect on overall exposure than an irregular pattern of missed doses does. Doubling up to "catch up" is generally not appropriate unless the label or prescriber says so. Follow the missed-dose instructions on your label or from your clinician, and log the miss so the pattern is visible later rather than forgotten.
For Clonidine the useful record is the dose, the time it was actually taken, and what else was taken in the same window. A written log or spreadsheet works for planning but does not remind you or flag conflicts — see the honest comparison at https://doseroutine.com/vs/spreadsheet and the wider roundup at https://doseroutine.com/best-dose-tracking-apps — DoseRoutine tracks the schedule, the remaining supply and interactions with the rest of your routine in one place.
Not stated here. The cited trials each used their own protocol amounts, and Clonidine is dosed by a prescriber or the approved product label — DoseRoutine records what you were told to take, it does not suggest an amount. Route reported: Oral (the route studied in the cited trials). Frequency reported: Set by the prescription or approved label, not by this record. These are amounts documented in the cited studies and labels for Clonidine — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
Which studies looked at Clonidine?
Peer-reviewed research indexed in PubMed. Each entry links to the original record.
- 1.Clonidine for post-traumatic stress disorder: a systematic review of the current evidence(opens PubMed in a new tab)Eur J Psychotraumatol · 2024 · PMID 38941125 · https://pubmed.ncbi.nlm.nih.gov/38941125/
Sources cited on this page
Specific documents referenced by the numbered markers above. Each number matches the marker in the text.
- MedlinePlus(opens in a new tab)U.S. National Library of Medicine · medlineplus.gov/druginfo/meds/a682243.html
- PubChem CID 2803(opens in a new tab)National Center for Biotechnology Information · pubchem.ncbi.nlm.nih.gov/compound/2803
Verify at
Publisher search links for Clonidine. These are places to check the information — they are not citations, so they are not numbered.
- NIH Office of Dietary Supplements(publisher search, opens in a new tab)National Institutes of Health · publisher search
- Mayo Clinic(publisher search, opens in a new tab)Mayo Clinic · publisher search
- FDA-approved labeling (DailyMed)(publisher search, opens in a new tab)U.S. Food and Drug Administration · publisher search
- European Medicines Agency(publisher search, opens in a new tab)European Medicines Agency · publisher search
- Cochrane Library(publisher search, opens in a new tab)Cochrane · publisher search
- DrugBank(publisher search, opens in a new tab)DrugBank Online · publisher search
- PubMed literature search(publisher search, opens in a new tab)National Library of Medicine · publisher search
- Wikipedia entry(publisher search, opens in a new tab)Wikipedia · publisher search
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician. How we source and review this information.
What is the short answer on Clonidine?
Plain-text summary, safe to quote verbatim:
Clonidine is a prescription medication primarily used to treat high blood pressure (hypertension). It is also prescribed for attention deficit hyperactivity disorder (ADHD), certain pain conditions, and withdrawal symptoms from opioids or alcohol. It is typically taken in the evening.
Source: DoseRoutine — https://doseroutine.com/library/clonidine
Clonidine cheat sheet
DoseRoutine cheat sheet · Medication
Clonidine
Clonidine is a prescription medication primarily used to treat high blood pressure (hypertension). It is also prescribed for attention deficit hyperactivity disorder (ADHD), certain pain conditions, and withdrawal symptoms from opioids or alcohol.
Evidence
Strong
1399 human randomized trials and regulatory approval on file.
Studied range
Not stated here. The cited trials each used their own protocol amounts, and Clonidine is dosed by a prescriber or the approved product label — DoseRoutine records what you were told to take, it does not suggest an amount.
Route
Oral (the route studied in the cited trials)
Frequency studied
Set by the prescription or approved label, not by this record
Half-life
12–16 h
Timing
in the evening
Storage
Room temperature, in the original container, away from moisture
Prescription only (US)Clonidine is an approved medicine; the cited literature reports trial outcomes, not dosing advice.
Studied ranges, not dosing advice. Not medical advice — talk to a clinician. doseroutine.com/library/clonidine
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). Clonidine — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/clonidine
What compounds are similar to Clonidine?
Others in the medication category or studied for the same goals.