acamprosate vs guanfacine
Side-by-side comparison of acamprosate and guanfacine Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
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Acamprosate is a medicine that can help you stay away from alcohol if you are alcohol-dependent and have already stopped drinking. It should be used with counseling and support.
Guanfacine extended-release tablets can help treat ADHD. It can be used alone or with stimulant medicines.
Acamprosate helps people who are alcohol-dependent to not drink alcohol. You must have already stopped drinking before you start taking acamprosate. This medicine works best when it is part of a complete treatment plan that includes counseling and support.
Guanfacine extended-release tablets are used to treat Attention Deficit Hyperactivity Disorder (ADHD). It can be used by itself or with other stimulant medicines to help manage ADHD symptoms. This medicine works by affecting certain receptors in the brain.
Acamprosate is similar to a natural substance in your brain. It is thought to work by helping to restore the normal balance of brain activity that is changed by long-term alcohol use. This can reduce your craving for alcohol.
Guanfacine is a central alpha 2A-adrenergic receptor agonist. This means it works by stimulating specific receptors in the brain. By stimulating these receptors, guanfacine helps to improve attention and reduce impulsivity and hyperactivity in people with ADHD.
- • Accidental injury
- • Weakness
- • Pain
- • Loss of appetite
- • Diarrhea
- • Feeling sleepy or tired
- • Low blood pressure
- • Dizziness
- • Upset stomach
- • Dry mouth
- Low blood pressure 14
- Weakness 13
- Condition worsened 13
- Using the medicine for something it is not approved for 13
- Sudden kidney damage 12
- The medicine is not working 778
- Using the medicine for a condition it is not approved for 598
- Sleepiness 455
- Being aggressive 376
- Feeling tired 330
Acamprosate may increase the risk of suicidal thoughts or actions. Your doctor should watch you for depression or suicidal thoughts. Tell your doctor right away if you have any new or worsening symptoms of depression or suicidal thoughts.
Guanfacine can cause low blood pressure, slow heart rate, and fainting. Tell your doctor if you have heart problems. This medicine can also cause sleepiness, so be careful driving or using heavy machinery. Stopping guanfacine suddenly can cause high blood pressure. Your doctor will slowly lower your dose when you stop taking it.
Acamprosate may harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is not known if acamprosate passes into breast milk. Talk to your doctor if you are breastfeeding.
Tell your doctor if you are pregnant or plan to become pregnant. There is a pregnancy registry for women who take ADHD medicines during pregnancy. Talk to your doctor if you are breastfeeding or plan to breastfeed. Monitor breastfed infants for sleepiness, lethargy, and poor feeding.
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How to Read This acamprosate vs guanfacine Comparison
acamprosate is classified in the GABA Analog (Alcohol Dependence) drug class, while guanfacine sits within the Central Alpha-2 Agonist class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, acamprosate has 65 submissions while guanfacine has 2,537. Those figures reflect cumulative reporting volume — not per-patient risk — so older, widely dispensed drugs typically look worse on count alone. No direct interaction between these two drugs is listed in our FDA-derived dataset, though co-prescription still warrants pharmacist review. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between acamprosate and guanfacine — always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.