Drug & supplement interaction

Citric Acid + Varenicline

Varenicline brand names: Chantix, Champix, Tyrvaya.

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

We found no known interaction between Citric Acid 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, and the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Citric Acid 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 Citric Acid 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 Citric Acid 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.

Citric Acid safety at a glance

Citric Acid overall Generally safe Generally recognized as safe in the small amounts found in foods and most supplements.
Pregnancy Likely Safe When citric acid is used orally in the amounts commonly found in foods. There is insufficient reliable information available about the safety of citric acid whe... Read the full pregnancy detail
Breastfeeding Likely Safe When citric acid is used orally in the amounts commonly found in foods. There is insufficient reliable information available about the safety of citric acid whe... Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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

No Interaction Found — But Data Suggests Citric Acid and Varenicline May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do. One of them is worth acting on rather than waiting out — marked below.

  • Bleeding or bruising Worth acting on Additional detail

    Citric Acid

    “Topically, citric acid seems to be well tolerated when used as part of formulations containing the alpha hydroxy acids glycolic acid and lactic acid in concentrations at or below 10% and applied to the face. In general, products should be tested on a small area of skin before applying it to a larger area.

    Alpha hydroxy acids like citric acid can increase sensitivity to the sun and ultraviolet (UV) light.”

    Citric Acid · Natural Medicines adverse-effect record, reported in burns.

    6 sources cited
    1. 106612. US Food and Drug Administration (FDA). Cosmetic Ingredients: Alpha Hydroxy Acids. August 2020. Available at: https://www.fda.gov/cosmetics/cosmetic-ingredients/alpha-hydroxy-acids. Accessed on October 19, 2021.
    2. 6080. Kurtzweil P. Alpha-hydroxy acids for skin care: Smooth sailing or rough seas? FDA 1999. Available at: /www.fda.gov/fdac/features/1998/298_ahas.html (Accessed 18 August 2000). DOI
    3. 10101. Erbagci Z, Akcali C. Biweekly serial glycolic acid peels vs. long-term daily use of topical low-strength glycolic acid in the treatment of atrophic acne scars. Int J Dermatol 2000;39:789-94.. PubMed
    4. 92209. Baumann LS, Oresajo C, Yatskayer M, Dahl A, Figueras K. Comparison of clindamycin 1% and benzoyl peroxide 5% gel to a novel composition containing salicylic acid, capryloyl salicylic acid, HEPES, glycolic acid, citric acid, and dioic acid in the treatment
    5. 92210. Emtestam L, Svensson Å, Rensfeldt K. Treatment of seborrhoeic dermatitis of the scalp with a topical solution of urea, lactic acid, and propylene glycol (K301): results of two double-blind, randomised, placebo-controlled studies. Mycoses. 2012 Sep;55(5):3 PubMed
    6. 92214. Kaminaka C, Uede M, Matsunaka H, Furukawa F, Yamomoto Y. Clinical evaluation of glycolic acid chemical peeling in patients with acne vulgaris: a randomized, double-blind, placebo-controlled, split-face comparative study. Dermatol Surg. 2014 Mar;40(3):314- PubMed

    Varenicline

    Listed in the ADVERSE REACTIONS section of the FDA label for Varenicline. Read the label on DailyMed ›

  • Sun sensitivity Additional detail

    Citric Acid

    Recorded for Citric Acid in the same Natural Medicines adverse-effect record shown under Bleeding or bruising above.

    Varenicline

    Listed in the ADVERSE REACTIONS section of the FDA label for Varenicline. Read the label on DailyMed ›

  • Swelling Additional detail

    Citric Acid

    Recorded for Citric Acid in the same Natural Medicines adverse-effect record shown under Bleeding or bruising above.

    Varenicline

    Listed in the ADVERSE REACTIONS section of the FDA label for Varenicline. Read the label on DailyMed ›

  • A skin rash Additional detail

    Citric Acid

    Recorded for Citric Acid in the same Natural Medicines adverse-effect record shown under Bleeding or bruising above.

    Varenicline

    Listed in the ADVERSE REACTIONS section of the FDA label for Varenicline. Read the label on DailyMed ›

Reported for Citric Acid but not commonly for Varenicline: numbness or tingling and itching.

Effects for Varenicline come from the ADVERSE REACTIONS section of its FDA label; effects for Citric Acid come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Citric Acid in Pregnancy & Breastfeeding

Pregnancy And Lactation Likely Safe

When citric acid is used orally in the amounts commonly found in foods. There is insufficient reliable information available about the safety of citric acid when used orally in larger amounts during pregnancy or lactation; avoid amounts greater than those found in foods.

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

How to take them

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

At least one FDA label for a product containing Varenicline says to take it with food. If you take Citric Acid 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.

Overlapping uses

What Varenicline Is Prescribed For, and What Citric Acid Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Varenicline is a prescription medicine with approved uses on its FDA label. Citric Acid is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Varenicline is prescribed for: 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.

Citric Acid has been studied for:

  • Smoking cessation studied, not established Citric Acid has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Citric Acid for smoking cessation

    It is unclear if inhaled citric acid is beneficial for smoking cessation.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Varenicline on your own; if you are taking Citric Acid for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

Everything else you take

See Every Supplement That Interacts With Varenicline

This page covers Citric Acid 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 Citric Acid as Part of a Dietary Supplement Product? Check It for Interactions

We hold 331 real supplement products containing Citric Acid, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Citric Acid. Even though Citric Acid 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 Citric Acid 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 Citric Acid
Top 25%

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

29 days ago today
Medication Varenicline
Top 25%

#439 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.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Citric Acid reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Citric Acid and Varenicline records this page draws on were last updated July 10, 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 Citric Acid

What is Citric Acid?

  • Food and drink flavoring or sourness
  • Preservative and acidity adjuster
  • Kidney stone prevention (as citrate salts)
  • Cleaning and descaling (non-medical)
  • Effervescent supplement and antacid blends

Citric acid is a natural acid found in citrus fruits and is widely used as a safe food additive, flavoring, and preservative. In medicine, citrate forms (like potassium or sodium citrate) are used to help prevent certain kidney stones and to make urine less acidic. For most people the small amounts in foods and supplements are safe, but concentrated products can irritate the mouth, stomach, and skin.

Naturally found in citrus fruits; commercially made by fermentation · Powder, crystals, liquid, effervescent tablets, and as an ingredient in foods, drinks, and supplements

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

Citric Acid: dosing

There is no standard supplement dose of plain citric acid, because it is mainly used as a food ingredient rather than a treatment. Amounts used in foods and drinks are small and considered safe.For medicinal citrate products (such as potassium citrate or sodium citrate used for kidney stones or urine alkalinization), dosing is individualized and should be set by a doctor, often based on lab tests.

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

Read the full Citric Acid 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 & Citric Acid

Browse every other medication we’ve checked against Citric Acid — 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 Citric Acid 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 Citric Acid list.

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

Citric Acid References

The 10 references that drive our Citric Acid 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. Kurtzweil P. Alpha-hydroxy acids for skin care: Smooth sailing or rough seas? FDA 1999. Available at: /www.fda.gov/fdac/features/1998/298_ahas.html (Accessed 18 August 2000). DOI
  2. Erbagci Z, Akcali C. Biweekly serial glycolic acid peels vs. long-term daily use of topical low-strength glycolic acid in the treatment of atrophic acne scars. Int J Dermatol 2000;39:789-94.. PubMed
  3. Ghadishah D, Gorchynski J. Airway compromise after routine alpha-hydroxy facial peel administration. J Emerg Med 2002;22:353-5.. PubMed
  4. Baumann LS, Oresajo C, Yatskayer M, Dahl A, Figueras K. Comparison of clindamycin 1% and benzoyl peroxide 5% gel to a novel composition containing salicylic acid, capryloyl salicylic acid, HEPES, glycolic acid, citric acid, and dioic acid in the treatment
  5. Emtestam L, Svensson Å, Rensfeldt K. Treatment of seborrhoeic dermatitis of the scalp with a topical solution of urea, lactic acid, and propylene glycol (K301): results of two double-blind, randomised, placebo-controlled studies. Mycoses. 2012 Sep;55(5):3 PubMed
  6. Kaminaka C, Uede M, Matsunaka H, Furukawa F, Yamomoto Y. Clinical evaluation of glycolic acid chemical peeling in patients with acne vulgaris: a randomized, double-blind, placebo-controlled, split-face comparative study. Dermatol Surg. 2014 Mar;40(3):314- PubMed
  7. Köse O, Özmen I, Arca E. An open, comparative study of 10% potassium hydroxide solution versus salicylic and lactic acid combination in the treatment of molluscum contagiosum in children. J Dermatolog Treat. 2013 Aug;24(4):300-4. PubMed
  8. Vachiramon V, Sahawatwong S, Sirithanabadeekul P. Treatment of melasma in men with low-fluence Q-switched neodymium-doped yttrium-aluminum-garnet laser versus combined laser and glycolic acid peeling. Dermatol Surg. 2015 Apr;41(4):457-65. PubMed
  9. US Food and Drug Administration (FDA). Cosmetic Ingredients: Alpha Hydroxy Acids. August 2020. Available at: https://www.fda.gov/cosmetics/cosmetic-ingredients/alpha-hydroxy-acids. Accessed on October 19, 2021.
  10. Ormerod AD, van Voorst Vader PC, Majewski S, Vanscheidt W, Benjamin N, van der Meijden W. Evaluation of the efficacy, safety, and tolerability of 3 dose regimens of topical sodium nitrite with citric acid in patients with anogenital warts: A randomized cl DOI

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 Citric Acid and Varenicline Together: Common Questions

Is it safe to take Citric Acid with Varenicline?
We do not list a known interaction between Citric Acid 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.
Do Citric Acid and Varenicline have any of the same side effects?
Yes — our sources link each of them separately to 4 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
Should I take Citric Acid 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 Citric Acid 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.
Are Citric Acid and Varenicline used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Citric Acid in each. That is a conversation for your prescriber, especially if Varenicline is being adjusted to a target.
Does Varenicline interact with any supplements?
Yes. Varenicline has documented interactions with 20 supplements in our database — Citric Acid 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

Citric Acid 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 10 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Varenicline and Citric Acid?

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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.