Drug & supplement interaction

Ornithine + Varenicline

Varenicline brand names: Chantix, Champix, Tyrvaya.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Ornithine and Varenicline in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the label for Varenicline states a food rule worth keeping to.

Know someone taking this? Share
Facebook Post Reddit Email
On this page
Interaction report

Ornithine and Varenicline

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Varenicline and Ornithine in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

Worth understanding: our licensed dataset holds no drug-interaction record for Ornithine at all — not against Varenicline, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Ornithine safety at a glance

Ornithine overall Use caution Generally well tolerated short-term, but long-term safety is not well studied.
Pregnancy Avoid Not enough safety data; best to avoid during pregnancy.
Breastfeeding Avoid Not enough safety data; best to avoid while breastfeeding.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Varenicline and Ornithine? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Varenicline’s Own FDA Label Lists

This is not an interaction — none of it involves Ornithine. These are the most notable effects listed in the ADVERSE REACTIONS section of Varenicline’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you take both. 10 of them are worth acting on rather than waiting out — marked below.

  • Kidney stones Worth acting on
  • Mania or an unusually elevated mood Worth acting on
  • Loss of vision Worth acting on
  • Dependence or withdrawal symptoms Worth acting on
  • Thoughts of self-harm Worth acting on
  • Hearing loss Worth acting on
  • A stroke or mini-stroke Worth acting on
  • A bowel blockage Worth acting on
  • Bone thinning Worth acting on
  • Memory problems Worth acting on

Showing the 10 most notable of 87 label-listed effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

From the ADVERSE REACTIONS section of the FDA label for Varenicline. Read the label on DailyMed › Ornithine’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Ornithine side to compare — that is a limit of the record, not a statement that Ornithine has no side effects.

How to take them

Some Varenicline Products Have a Food Rule — Ornithine Should Not Break It

At least one FDA label for a product containing Varenicline says to take it with food. If you take Ornithine on an empty stomach out of habit, keep them separate — and take Varenicline with a meal where the label says to.

This may not be true of your version. Food instructions belong to the product, not the ingredient: two Varenicline products can carry different directions, and extended-release forms often differ from immediate-release ones. The label we read is quoted below — check the directions on your own box or bottle, or ask your pharmacist, for how to take the exact product you were given.

Varenicline tablets should be taken orally after eating and with a full glass of water.

From the Dosage and Administration section of the FDA label we read for Varenicline — where that label names a specific product, the instruction is that product's. Read the label on DailyMed ›

A food rule is not an interaction — it is about how much of the medicine you absorb. The directions that came with your own product, and your pharmacist, outrank anything on this page.

Everything else you take

See Every Supplement That Interacts With Varenicline

This page covers Ornithine only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Varenicline page lists 20 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Beer (moderate), Coffee Charcoal (moderate), European Mandrake (moderate) and Glucomannan (moderate).

By severity: 1 major · 10 moderate · 9 minor.

From our pharmacist’s overview on the Varenicline page

“For anyone taking varenicline (Chantix, Champix, Tyrvaya) to quit smoking, this list earns real caution rather than a quick skim. Activated charcoal is the single entry rated major; it binds many medicines in the gut and can pull varenicline's blood levels down, and losing that support mid-quit is a genuine setback.”

Reviewed by 2 · Jul 18, 2026

Open the Varenicline interaction page

One more smart check

Taking Ornithine as Part of a Dietary Supplement Product? Check It for Interactions

We hold 751 real supplement products containing Ornithine, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Ornithine. Even though Ornithine itself has no known interaction with Varenicline, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Ornithine and Varenicline Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Ornithine
Top 25%

#265 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Varenicline
Top half

#1,238 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions. Ornithine is not yet covered by that licensed database, so its write-up cites publicly available medical sources directly (see the references below).
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Ornithine reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Ornithine and Varenicline records this page draws on were last updated June 22, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Ornithine

What is Ornithine?

  • Athletic performance and recovery
  • Reducing fatigue
  • Sleep and stress support
  • Liver and ammonia metabolism support
  • Wound healing

Ornithine is a non-essential amino acid your body makes naturally as part of the urea cycle, which helps remove ammonia. It is sold as a supplement for fatigue, exercise recovery, and sleep, but human evidence is limited and mixed. Talk to your pharmacist or doctor before using it, especially if you have a medical condition.

Amino acid (not a plant part) · Capsules, tablets, powder, often as L-ornithine or ornithine alpha-ketoglutarate (OKG)

An interaction check asks whether these two react with each other — it does not ask whether Ornithine is a good idea for someone in your situation. Here is what our Ornithine record says about it on its own.

Ornithine: dosing

There is no official, standardized dose of ornithine for any supplement use. Amounts used in studies have varied widely, and there is not enough strong evidence to recommend a specific dose.The safest approach is to follow the directions on the product label and not exceed them.

From our Ornithine monograph — the full record covers uses, side effects and every documented interaction.

Read the full Ornithine monograph & all interactions
Medication

About Varenicline

What Is Varenicline Used For?

Brand names: Chantix, Champix, Tyrvaya

Varenicline tablets — sold under brand names including Chantix — are used to help adults quit smoking. They work as part of a structured smoking cessation program.

Tyrvaya (varenicline solution) nasal spray is a separate product used to treat the signs and symptoms of dry eye disease. It is not used for smoking cessation.

Most-Reported Side Effects for Varenicline

From FAERS, the FDA’s public side-effect reporting system (0 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Nausea 14,514 reports
Depression 8,686 reports
Abnormal dreams 7,841 reports
Anxiety 5,978 reports
Insomnia 5,620 reports
See full Varenicline drug information
Keep checking

Other Drugs & Ornithine

Browse every other medication we’ve checked against Ornithine — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

We also checked Ornithine against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Ornithine list.

See the full Ornithine interactions page
See every supplement checked against Varenicline, ranked by severity
Evidence & sources

Ornithine References

The 1 sources that drive our Ornithine monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Ornithine is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.

  1. Dietary Supplements: What You Need to Know — NIH Office of Dietary Supplements Source

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Ornithine and Varenicline Together: Common Questions

Is it safe to take Ornithine with Varenicline?
We do not list a known interaction between Ornithine and Varenicline. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Should I take Ornithine and Varenicline at the same time of day?
At least one FDA label for a product containing Varenicline says to take it with food. If you take Ornithine on an empty stomach out of habit, keep them separate and take Varenicline with a meal where the label says to. Food instructions belong to the product rather than the ingredient — two Varenicline products can differ — so check the directions on your own box. This is about absorption, not an interaction.
Does Varenicline interact with any supplements?
Yes. Varenicline has documented interactions with 20 supplements in our database — Ornithine is not one of them. The Varenicline interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Ornithine monograph Uses, safety profile, and every drug interaction in one place Varenicline drug information The full plain-English guide to this medication Varenicline supplement interactions Every supplement checked against Varenicline, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 1 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Varenicline and Ornithine?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

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.