Herb & supplement monograph

Homotaurine Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by ·Updated July 2026
What is this page for?

First and foremost: how Homotaurine interacts with medications. The heart of this page is the interaction list — every drug Homotaurine is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Homotaurine is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Interaction report

Drugs that interact with Homotaurine

0 medications have a known interaction with Homotaurine, graded by severity. Select any drug for the full evidence-based detail.

We don’t currently list any known drug interactions for Homotaurine. This doesn’t guarantee none exist — always confirm with your pharmacist before combining supplements with your medications.

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

  • Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
  • Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
  • Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
  • No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

  • Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
  • Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
  • Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

  • Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
  • Each drug listed above links to the full report for that exact Homotaurine combination — clinical detail, likelihood, evidence level, and citations.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
Monograph

Homotaurine: Uses, Safety & Side Effects

Medically reviewed by · Reviewed July 2026 ·
The bottom line

Homotaurine (also called tramiprosate) is a small amino acid-like molecule studied mainly for slowing memory loss and Alzheimer's disease. Large clinical trials did not clearly prove it works, and it is now sold as a dietary supplement rather than an approved drug. Talk to your pharmacist or doctor before using it, especially if you have a medical condition.

Part used
Synthesized compound (also found naturally in some seaweeds)
Common forms
Capsules, tablets
People commonly use it for
  • Memory support
  • Brain and cognitive health
  • Alzheimer's disease (investigational)
  • General neuroprotection

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance
OverallUse caution

Generally tolerated in studies, but long-term safety as a supplement is not well established.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full pregnancy detail
BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Homotaurine is a small molecule that is chemically similar to taurine, a natural amino acid in the body. It is also known by the drug name tramiprosate. Small amounts occur naturally in certain types of seaweed, but the homotaurine in supplements is usually made in a lab.

Homotaurine first gained attention as a possible treatment for Alzheimer's disease. After it was studied as a drug and did not get approval, it became available in some countries as a dietary supplement marketed for memory and brain health.

How it works

Homotaurine is thought to bind to beta-amyloid, a protein that clumps together to form the plaques seen in Alzheimer's disease. By attaching to amyloid, it may help reduce how much these proteins stick together, at least in laboratory studies.

It may also interact with GABA receptors in the brain, which are involved in calming nerve signals. These mechanisms are mostly based on laboratory and animal research, and it is not clear how much they matter in people.

Effectiveness

Does Homotaurine work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by .

Evidence overview · 4 uses evaluated
4 Insufficient evidence
How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.
2Likely EffectiveGood evidence, though not yet conclusive.
3Possibly EffectiveSome evidence suggests a benefit.
4Possibly IneffectiveSome evidence it may not help.
5Likely IneffectiveFairly strong evidence it doesn’t help.
6IneffectiveStrong evidence it doesn’t work.
7Insufficient Reliable Evidence to RateToo little research to say either way.

For Homotaurine, current evidence isn’t strong enough to rate any specific use. The conditions it has been studied for are listed below.

Also studied for 4 conditions — evidence insufficient to rate
Insufficient Reliable Evidence To Rate Alzheimer disease
Rating & evidence shown verbatim from Natural Medicines

The majority of research in individuals with Alzheimer disease shows that homotaurine does not improve cognitive function. However, homotaurine might have benefit in specific individuals with mild symptoms, especially those with homozygous APOE4/4.

Sources Ref 17062 Ref 17064 Ref 17065 Ref 17066 Ref 17067 Ref 101097 Ref 101100 Ref 101101
Insufficient Reliable Evidence To Rate Cognitive impairment
Rating & evidence shown verbatim from Natural Medicines

Preliminary clinical research in patients with amnestic mild cognitive impairment shows that taking homotaurine 50 mg twice daily for one year improves immediate short-term memory recall by about 18%, compared to a slight worsening in untreated patients. The improvement in memory with homotaurine is associated with anti-inflammatory activity, and an attenuation of hippocampal volume loss.

Sources Ref 101094 Ref 101098 Ref 112072
Insufficient Reliable Evidence To Rate Glaucoma
Rating & evidence shown verbatim from Natural Medicines

Preliminary clinical research in adults with primary open-angle glaucoma and controlled intraocular pressure shows that taking homotaurine 50 mg, citicoline 500 mg, and vitamin E 12 mg orally once daily for 4 months, in addition to standard pressure-lowering treatment, improves visual contrast sensitivity scores and self-reported quality of life scores by about 10%, when compared with standard treatment alone. Other preliminary clinical research in adults with primary open-angle glaucoma and intraocular pressure controlled with beta blocker and/or prostaglandin analog eye drops, shows that taking a specific combination of homotaurine 50 mg and citicoline 500 mg (Neuprozin) orally once daily for 4 months improves retinal cell function and neural conduction when compared with eye drop treatment alone, without altering intraocular pressure. Pattern standard deviation, which measures localized loss in the visual field is improved. It is unclear if these effects are due to homotaurine, other ingredients, or the combinations, although some evidence suggests a synergistic effect between homotaurine and citicoline.

Sources Ref 104786 Ref 112074
Insufficient Reliable Evidence To Rate Parkinson disease
Rating & evidence shown verbatim from Natural Medicines

Preliminary clinical research shows that taking homotaurine 50 mg twice daily for 6 months does not improve symptoms of Parkinson disease when compared with no treatment. However, it has a modest effect on daytime sleepiness when compared to baseline. The validity of this finding is limited by the lack of a comparator group.

Sources Ref 101099

Source & disclaimer. Effectiveness ratings and evidence summaries are provided by Natural Medicines (Therapeutic Research Center) and shown as licensed. Where Natural Medicines hasn’t rated a use, HelloPharmacist’s pharmacists may add their own reviewed rating and evidence (each such entry is labeled). This is educational information, not medical advice — talk with your pharmacist or doctor before starting, stopping, or changing a supplement.

Safety & precautions

In clinical trials, homotaurine was generally well tolerated by most people. However, its long-term safety when used as an everyday supplement is not well studied.

People with kidney or liver problems, neurological conditions, or those taking medicines for memory or mood should check with a doctor or pharmacist first. Because brains and bodies vary, it is wise to be cautious.

Pregnancy and breastfeeding: There is not enough safety information for these situations, so homotaurine should be avoided during pregnancy and while breastfeeding.

Side effects

Reported side effects in studies were usually mild. They may include nausea, vomiting, diarrhea, and dizziness or lightheadedness.

Serious side effects were uncommon in trials, but because long-term supplement use is not well studied, the full safety picture is not known. Stop taking it and seek medical care if you have signs of an allergic reaction, such as rash, swelling, or trouble breathing.

Homotaurine: Reported Adverse Effects

Documented safety reports on Homotaurine from the evidence-graded Natural Medicines (TRC Healthcare) database, shown word-for-word from the licensed record.

Orally, homotaurine seems to be generally well tolerated. The most frequent side effects reported in clinical trials are nausea, vomiting, diarrhea, dizziness, headache, and sleep disorders.

  1. Greenberg SM, Rosand J, Schneider AT, et al. A phase 2 study of tramiprosate for cerebral amyloid angiopathy. Alzheimer Dis Assoc Disord 2006;20:269-74.
  2. Aisen PS, Saumier D, Briand R, et al. A Phase II study targeting amyloid-beta with 3APS in mild-to-moderate Alzheimer disease. Neurology 2006;67:1757-63.
  3. Wright TM. Tramiprosate. Drugs Today (Barc) 2006;42:291-8.
  4. Abushakra S, Porsteinsson A, Scheltens P, et al. Clinical effects of tramiprosate in APOE4/4 homozygous patients with mild Alzheimer's disease suggest disease modification potential. J Prev Alzheimers Dis. 2017;4(3):149-156.
  5. Ricciardi L, De Nigris F, Specchia A, Fasano A. Homotaurine in Parkinson's disease. Neurol Sci. 2015;36(9):1581-7.
  6. Marino PF, Rossi GCM, Campagna G, et al. Effects of citicoline, homotaurine, and vitamin E on contrast sensitivity and visual-related quality of life in patients with primary open-angle glaucoma: A preliminary study. Molecules. 2020 Nov 29;25(23):5614.
Reports by condition
Cluster headache Neurologic/CNS

Orally, some of the most frequent side effects of homotaurine are dizziness, headache, and sleep disorders.

  1. Greenberg SM, Rosand J, Schneider AT, et al. A phase 2 study of tramiprosate for cerebral amyloid angiopathy. Alzheimer Dis Assoc Disord 2006;20:269-74.
  2. Aisen PS, Saumier D, Briand R, et al. A Phase II study targeting amyloid-beta with 3APS in mild-to-moderate Alzheimer disease. Neurology 2006;67:1757-63.
  3. Wright TM. Tramiprosate. Drugs Today (Barc) 2006;42:291-8.
  4. Marino PF, Rossi GCM, Campagna G, et al. Effects of citicoline, homotaurine, and vitamin E on contrast sensitivity and visual-related quality of life in patients with primary open-angle glaucoma: A preliminary study. Molecules. 2020 Nov 29;25(23):5614.
Diarrhea Gastrointestinal

Orally, some of the most frequent side effects of homotaurine are nausea, vomiting, and diarrhea. Nausea and vomiting are dose-dependent and the incidence ranges from 5% to 30% with doses of 50-150 mg twice daily. However, in some large studies, nausea and vomiting occurred at a similar rate in the placebo group.

  1. Greenberg SM, Rosand J, Schneider AT, et al. A phase 2 study of tramiprosate for cerebral amyloid angiopathy. Alzheimer Dis Assoc Disord 2006;20:269-74.
  2. Aisen PS, Saumier D, Briand R, et al. A Phase II study targeting amyloid-beta with 3APS in mild-to-moderate Alzheimer disease. Neurology 2006;67:1757-63.
  3. Wright TM. Tramiprosate. Drugs Today (Barc) 2006;42:291-8.
  4. Abushakra S, Porsteinsson A, Scheltens P, et al. Clinical effects of tramiprosate in APOE4/4 homozygous patients with mild Alzheimer's disease suggest disease modification potential. J Prev Alzheimers Dis. 2017;4(3):149-156.
  5. Ricciardi L, De Nigris F, Specchia A, Fasano A. Homotaurine in Parkinson's disease. Neurol Sci. 2015;36(9):1581-7.
  6. Marino PF, Rossi GCM, Campagna G, et al. Effects of citicoline, homotaurine, and vitamin E on contrast sensitivity and visual-related quality of life in patients with primary open-angle glaucoma: A preliminary study. Molecules. 2020 Nov 29;25(23):5614.
DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.

Adverse-effects data: Natural Medicines, Therapeutic Research Center

Dosing

There is no officially established supplement dose for homotaurine. Doses used in research were chosen for studying Alzheimer's disease and may not match what is sold in stores.

If you choose to use a homotaurine product, follow the directions on the label and do not exceed the recommended amount. Because product quality and strength can vary, ask your pharmacist to help you review the label and decide whether it is appropriate for you.

Pregnancy & Breastfeeding

Homotaurine & Pregnancy

Insufficient reliable information

Insufficient reliable information available; avoid using.

Homotaurine & Breastfeeding

Insufficient reliable information

Insufficient reliable information available; avoid using.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.

© 2026 Therapeutic Research Center

Pregnancy & lactation ratings: Natural Medicines, Therapeutic Research Center

References & further reading

The 15 references that drive our Homotaurine monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Aisen PS, Gauthier S, Vellas B, et al. Alzhemed: a potential treatment for Alzheimer's disease. Curr Alzheimer Res 2007;4:473-8.
  2. Greenberg SM, Rosand J, Schneider AT, et al. A phase 2 study of tramiprosate for cerebral amyloid angiopathy. Alzheimer Dis Assoc Disord 2006;20:269-74. PubMed
  3. Aisen PS, Saumier D, Briand R, et al. A Phase II study targeting amyloid-beta with 3APS in mild-to-moderate Alzheimer disease. Neurology 2006;67:1757-63.
  4. Wright TM. Tramiprosate. Drugs Today (Barc) 2006;42:291-8.
  5. Wong GT. FDA deems US Alzhemed trial results inconclusive. Alzheimer Research Forum. August 28, 2007. Available at: www.alzforum.org/new/detail.asp?id=1647. (Accessed 26 May 2009).
  6. McCaffrey P, Strobel G. Philadelphia: European trial of Alzhemed ends, marketing morphs to supplement. Alzheimer Research Forum. November 19, 2007. Available at: www.alzforum.org/new/detail.asp?id=1691. (Accessed 26 May 2009).
  7. Bossú P, Salani F, Ciaramella A, et al. Anti-inflammatory effects of homotaurine in patients with amnestic mild cognitive impairment. Front Aging Neurosci. 2018;10:285. PubMed
  8. Abushakra S, Porsteinsson A, Scheltens P, et al. Clinical effects of tramiprosate in APOE4/4 homozygous patients with mild Alzheimer's disease suggest disease modification potential. J Prev Alzheimers Dis. 2017;4(3):149-156. PubMed
  9. Spalletta G, Cravello L, Gianni W, et al. Homotaurine effects on hippocampal volume loss and episodic memory in amnestic mild cognitive impairment. J Alzheimers Dis. 2016;50(3):807-16. PubMed
  10. Ricciardi L, De Nigris F, Specchia A, Fasano A. Homotaurine in Parkinson's disease. Neurol Sci. 2015;36(9):1581-7. PubMed
  11. Gauthier S, Aisen PS, Ferris SH, et al. Effect of tramiprosate in patients with mild-to-moderate Alzheimer's disease: exploratory analyses of the MRI sub-group of the Alphase study. J Nutr Health Aging. 2009;13(6):550-7. PubMed
  12. Aisen PS, Gauthier S, Ferris SH, et al. Tramiprosate in mild-to-moderate Alzheimer's disease - a randomized, double-blind, placebo-controlled, multi-centre study (the Alphase Study). Arch Med Sci. 2011;7(1):102-11. PubMed
  13. Marino PF, Rossi GCM, Campagna G, et al. Effects of citicoline, homotaurine, and vitamin E on contrast sensitivity and visual-related quality of life in patients with primary open-angle glaucoma: A preliminary study. Molecules. 2020 Nov 29;25(23):5614. PubMed
  14. Toppi E, Sireno L, Lembo M, et al. IL-33 and IL-10 Serum Levels Increase in MCI Patients Following Homotaurine Treatment. Front Immunol 2022;13:813951. PubMed
  15. Rossi GCM, Rolle T, De Silvestri A, et al. Multicenter, Prospective, Randomized, Single Blind, Cross-Over Study on the Effect of a Fixed Combination of Citicoline 500 mg Plus Homotaurine 50 mg on Pattern Electroretinogram (PERG) in Patients With Open Angl
Keep reading

This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Brand directory

Brands that make products with Homotaurine

1 brand in our database make a supplement containing Homotaurine.

Product directory

Supplement products with Homotaurine

2 products in our database contain Homotaurine. Open any to see its full ingredient list and every drug interaction we check.

Pharmacist Counseling Corner

Homotaurine: Common Questions

What is Homotaurine used for, and does it work?
People use Homotaurine for a range of reasons, but according to the Natural Medicines database the current clinical evidence is insufficient to confirm it works for the specific conditions it has been studied for. See the graded list on this page, and talk to your pharmacist or doctor before relying on it for any condition.
Does Homotaurine interact with prescription medications?
We do not currently list any known drug interactions for Homotaurine. This does not guarantee that none exist, so always confirm with your pharmacist before combining it with your medications.
How are Homotaurine interactions rated?
Each interaction is graded major, moderate, or minor based on how clinically significant it is and the strength of the evidence behind it. Major interactions are the most serious and are best avoided, or used only under close professional supervision.
Is it safe to take Homotaurine with my medications?
It depends on the specific medication. Some combinations are fine, while others call for monitoring, timing changes, or should be avoided. Check your exact drug above and confirm with your pharmacist or doctor before starting, stopping, or changing anything.
Where does this Homotaurine interaction information come from?
Our interaction data is built on the Natural Medicines database — an evidence-graded reference for vitamins, herbs, and supplements — and is reviewed by licensed HelloPharmacist pharmacists, who may add clinical context.
What is Homotaurine used for?
It is most commonly used as a supplement for memory and brain health, and it was studied as a possible treatment to slow Alzheimer's disease. The evidence that it actually works is limited and not convincing.
Is Homotaurine the same as tramiprosate?
Yes. Tramiprosate is the drug name for Homotaurine. It was tested as a medicine for Alzheimer's disease but is now mainly sold as a dietary supplement in some countries.
Is Homotaurine safe to take?
It was generally well tolerated in clinical trials, but its long-term safety as a supplement is not well studied. Check with your pharmacist or doctor before using it, especially if you have a health condition.
Can I take Homotaurine if I'm pregnant or breastfeeding?
No reliable safety information exists for these situations, so it is best to avoid Homotaurine during pregnancy and breastfeeding.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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Products that contain Homotaurine

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