Intuniv Withdrawal & Tapering Guide
guanfacine
In short
Intuniv (guanfacine) is an NRI with a half-life of ~17 hours. Step down 1mg per week. Withdrawal symptoms, when they occur, usually begin 1-3 days and settle within 2-4 weeks. It is also sold as Tenex.
- Class
- NRI
- Half-life
- ~17 hours
- Common doses
- 1mg, 2mg, 3mg, 4mg ER tablets
- Withdrawal onset
- 1-3 days
- Typical resolution
- 2-4 weeks
Educational reference only. Dose changes are decided with the prescriber who knows your history.
Overview
Guanfacine ER is a selective alpha-2A adrenergic agonist for ADHD (children, adolescents, sometimes adults) and an off-label add-on for hypertension and tics. Non-stimulant, non-controlled. Sedation and rebound hypertension on stopping are the main concerns.
1mg, 2mg, 3mg, 4mg ER tablets
ER tablets: 1mg, 2mg, 3mg, 4mg; IR tablets (Tenex): 1mg, 2mg
Category B
Mechanism of Action
Selective alpha-2A adrenoceptor agonist in the prefrontal cortex — improves working memory and impulse control by strengthening prefrontal connectivity.
Taper Notes
Step down 1mg per week. Do not stop abruptly — rebound hypertension is real.
Hyperbolic Tapering Guidance
A planned step-down avoids the cardiovascular rebound that abrupt discontinuation can cause.
Summary written by TaperCommunity, informed by the Maudsley Deprescribing Guidelines (Horowitz & Taylor) and related literature — see Sources & References below. Not affiliated with or endorsed by the Maudsley.
Withdrawal Timeline
1-3 days
5-10 days
2-4 weeks
Sleep changes can persist 4-6 weeks
Common Withdrawal Symptoms
Interactions & Safety
Drug Interactions
- Strong CYP3A4 inhibitors — increase exposure
- Strong CYP3A4 inducers — reduce efficacy
- Other antihypertensives, CNS depressants — additive
Contraindications
- Known hypersensitivity
Toxicity
Sedation, hypotension, bradycardia, syncope, dry mouth, abdominal pain. Rebound hypertension on abrupt discontinuation.
Pharmacokinetics
ADME Profile
Hepatic via CYP3A4.
Need a clinician who understands tapering?
Browse our map of deprescribing-informed providers worldwide.
Other Drug Profiles
The arithmetic of a proportional reduction
The Maudsley Deprescribing Guidelines and NICE NG222 describe reducing NRI medications by a proportion of the previous dose rather than by a fixed amount, so each cut is smaller than the last. The table shows what that arithmetic produces at 10% per step, using 2 mg only as a worked example. How large each step is, how long it is held, and whether this pattern applies at all are decisions for the person and their prescriber.
| Step | % of starting dose | Worked example (2 mg start) |
|---|---|---|
| Start | 100% | 2 mg |
| Step 1 | 90% | 1.8 mg |
| Step 2 | 81% | 1.62 mg |
| Step 3 | 73% | 1.46 mg |
| Step 4 | 66% | 1.31 mg |
| Step 5 | 59% | 1.18 mg |
| Step 6 | 53% | 1.06 mg |
| Step 7 | 48% | 0.957 mg |
| Step 8 | 43% | 0.861 mg |
This is an illustration of a published method, not a schedule for anyone. It does not account for how long you have taken Intuniv, your current dose, formulation, or history. TaperCommunity does not recommend doses or dose changes; those are agreed with your prescriber.
Frequently asked questions about Intuniv
What are the withdrawal symptoms of Intuniv (guanfacine)?
Common withdrawal symptoms of Intuniv (guanfacine) include: rebound hypertension, rebound tachycardia, anxiety, insomnia, rebound ADHD/tic symptoms. Symptom severity varies by individual, dose, and duration of use.
How should I taper off Intuniv (guanfacine)?
Step down 1mg per week. Do not stop abruptly — rebound hypertension is real. A planned step-down avoids the cardiovascular rebound that abrupt discontinuation can cause.
How long does Intuniv withdrawal last?
Intuniv withdrawal typically begins 1-3 days, peaks around 5-10 days, and resolves within 2-4 weeks. Sleep changes can persist 4-6 weeks
Can I stop Intuniv cold turkey?
Stopping Intuniv abruptly is not recommended. Its half-life is ~17 hours, and the receptor adaptations built up during treatment do not reverse at that speed, so a sudden stop tends to produce the sharpest withdrawal. Prescribing guidance favours gradual, proportional reductions agreed with your prescriber.
How long does Intuniv stay in your system?
Intuniv (guanfacine) has a half-life of ~17 hours. A drug is mostly cleared after about five half-lives, so Intuniv is largely out of the body about 4 days after the last dose, longer in older adults or with liver or kidney impairment. Withdrawal symptoms often begin before the drug has fully cleared and continue after it has, because the adaptations the brain made during treatment reverse more slowly than the drug leaves the blood.
Sources & References
Intuniv (guanfacine) information on this page is sourced from peer-reviewed research, regulatory bodies, clinical guidelines, and patient-advocacy organizations.
Encyclopedic & chemical databases
Neutral, high-authority entity references.
Regulatory sources
Official prescribing information and safety notices.
Peer-reviewed research
Primary literature cited in this taper guide.
- Horowitz MA, Taylor D 2019 — Tapering of SSRI treatment to mitigate withdrawal symptoms (hyperbolic taper) (The Lancet Psychiatry)
- Davies J, Read J 2019 — A systematic review into the incidence, severity and duration of antidepressant withdrawal effects (Addictive Behaviors)
- Framer A 2021 — The patient voice: an exploration of the experience of withdrawal from antidepressants (Therapeutic Advances in Psychopharmacology)
Clinical guidelines
Evidence-based deprescribing and prescribing standards.
Deprescribing-specific resources
Clinician-facing references on tapering protocols.
- Deprescribing.org — Evidence-based deprescribing algorithms from the Bruyère Research Institute
- Royal College of Psychiatrists — Stopping antidepressants — UK clinical guidance on safely discontinuing antidepressants
Patient-advocacy & lived-experience
Long-running communities documenting withdrawal experience.
- Surviving Antidepressants — tapering forum — Long-running community archive of antidepressant taper experiences
- Inner Compass Initiative — Withdrawal Project — Peer-led resources for psychiatric drug withdrawal
- Mad in America — antidepressant withdrawal archive — Journalism and personal narratives on SSRI/SNRI discontinuation
- RxISK — adverse drug reaction reporting — Independent database of patient-reported adverse effects
TaperCommunity does not provide medical advice. Always consult a qualified prescriber before adjusting psychiatric medication.