Drug & supplement interaction

Lemon + Efavirenz

Efavirenz brand name: Sustiva.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Lemon and Efavirenz 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.

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Interaction report

Lemon and Efavirenz

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 Efavirenz and Lemon 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.

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.

Lemon safety at a glance

Lemon overall Generally safe Lemon as a food or drink is safe for most people in normal amounts.
Pregnancy Use caution Lemon as a food is fine, but avoid concentrated supplements or essential oils unless your doctor approves.
Breastfeeding Use caution Lemon in food is generally fine; medicinal amounts or essential oils have not been well studied.

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

Still wondering about combining Efavirenz and Lemon? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Efavirenz

Interactions in our licensed database are recorded against drug classes, not just single drug names. Efavirenz is filed under 8 classifications — including non-nucleoside reverse transcriptase inhibitors (nnrtis), cytochrome p450 2c19 (cyp2c19) inhibitors, cytochrome p450 2c9 (cyp2c9) inhibitors. Lemon has documented interactions with 1 drug class — the most serious being itraconazole (sporanox) (minor) — and none of Efavirenz’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Lemon Does Interact With Other Medications

Lemon has 1 minor known drug interaction in our database — Efavirenz isn’t one of them. If you take anything else, check it against the full list below.

Minor 1 No known interaction 2,829 (incl. Efavirenz)
Taking anything else?

Check Another of Your Medications Against Lemon

Covers the 2,830 medications we’ve checked against Lemon. Pick one to open its full report.

What to actually watch for

What Lemon Itself Has Been Linked To

This is not an interaction — nothing below involves Efavirenz. It is the side-effect record for Lemon on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Lemon, this list is the first place to look.

  • Heartburn Additional detail

    “Orally, fresh lemon juice, taken as 60 mL twice daily, has been reported to cause gastrointestinal disturbances in 37% of patients in one clinical trial, compared with 8% of patients in the placebo group. Specifically, of the patients consuming lemon juice, 21% experienced heartburn and 8% experienced epigastralgia, compared to 1% and 3%, respectively, in the placebo group.”

    Lemon · Natural Medicines adverse-effect record, reported in dyspepsia.

    1 source cited
    1. 107489. Ruggenenti P, Caruso MR, Cortinovis M, et al. Fresh lemon juice supplementation for the prevention of recurrent stones in calcium oxalate nephrolithiasis: A pragmatic, prospective, randomised, open, blinded endpoint (PROBE) trial. EClinicalMedicine 2021;4 PubMed
  • Stomach upset Additional detail

    Recorded for Lemon in the same Natural Medicines adverse-effect record shown under Heartburn above.

Everything above comes from the Natural Medicines adverse-effect record for Lemon — expand a row for the licensed statement it rests on. We read the ADVERSE REACTIONS section of Efavirenz’s FDA label too, and the two lists don’t meaningfully overlap — which is why no Efavirenz column appears here.

From our Q&A

Questions About Lemon or Efavirenz

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Lemon or Efavirenz, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Efavirenz

This page covers Lemon only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Efavirenz page lists 159 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Grapefruit (major), St. John's Wort (major), Acacia Rigidula (moderate) and Adrafinil (moderate).

By severity: 3 major · 117 moderate · 39 minor.

From our pharmacist’s overview on the Efavirenz page

“Efavirenz (Sustiva) is an HIV medicine, so an interaction that weakens it can cost more than a bad day; it can invite viral resistance. That makes this a list to treat with genuine care.”

Reviewed by 2 · Jul 18, 2026

Open the Efavirenz interaction page

One more smart check

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

We hold 1,390 real supplement products containing Lemon, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Lemon. Even though Lemon itself has no known interaction with Efavirenz, 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 Lemon and Efavirenz 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 Lemon
Top 25%

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

29 days ago today
Medication Efavirenz
Steady interest

#1,644 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 Lemon reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Lemon and Efavirenz 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 Lemon

What is Lemon?

  • Vitamin C source
  • Digestive support
  • Flavoring and aromatherapy
  • Skin and hair care
  • Sore throat and cold relief
  • Kidney stone prevention (dietary)

Lemon is a common citrus fruit that is a good source of vitamin C and citric acid, and it is widely used in food, drinks, and home remedies. While it can support hydration and a healthy diet, most claimed medicinal benefits are not strongly proven. As a food, lemon is very safe for most people, but concentrated essential oils and extracts call for more caution.

Citrus limon · Rutaceae · Fruit (juice, pulp, and peel), essential oil · Fresh fruit, juice, peel/zest, essential oil, tea, capsules, extracts

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

Lemon: dosing

There is no official standardized medicinal dose for lemon. Most people simply use it as a food or flavoring, such as adding lemon juice to water, tea, or meals.For supplements, extracts, or essential oils, there is no well-established dose, so follow the product label and do not exceed the suggested amount. Essential oils are very concentrated and should be diluted properly and never swallowed without professional guidance.

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

Read the full Lemon monograph & all interactions
Medication

About Efavirenz

What Is Efavirenz Used For?

Brand name: Sustiva

Efavirenz is used to treat HIV-1 (human immunodeficiency virus type 1) infection. It is always used together with other antiretroviral medicines — never on its own.

It is approved for adults and for children who are at least 3 months old and weigh at least 3.5 kg (about 7.7 lbs). Both the capsule and tablet forms are approved for this use.

Most-Reported Side Effects for Efavirenz

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.

Virologic failure 960 reports
Drug resistance 742 reports
Viral mutation identified 676 reports
Pathogen resistance 641 reports
Foetal exposure during pregnancy 621 reports
See full Efavirenz drug information
Keep checking

Other Drugs & Lemon

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

0Major
0Moderate
1Minor
2,828No known interaction
1 Minor 2,828 No interaction
Minor

1 interaction

No interaction 2,828 drugs checked — show the list

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

Showing the 60 most looked-up of 2,828 medications checked with no known interaction — see the full Lemon list.

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

Lemon References

The 2 references that drive our Lemon 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. Ruggenenti P, Caruso MR, Cortinovis M, et al. Fresh lemon juice supplementation for the prevention of recurrent stones in calcium oxalate nephrolithiasis: A pragmatic, prospective, randomised, open, blinded endpoint (PROBE) trial. EClinicalMedicine 2021;4 PubMed
  2. Umemura K, Katada Y, Nakagawa S, et al. Improved absorption of itraconazole tablet by co-administration with lemon beverages in a lung transplant recipient: A case report. J Infect Chemother 2022;28(8):1203-1207. PubMed

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 Lemon and Efavirenz Together: Common Questions

Is it safe to take Lemon with Efavirenz?
We do not list a known interaction between Lemon and Efavirenz. 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.
How was the Lemon and Efavirenz combination checked?
Interactions in our licensed database are recorded against drug classes. Efavirenz is filed under 8 classifications, and Lemon has documented interactions with 1 drug class — none of Efavirenz's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Lemon interact with any other medications?
Yes. Lemon has 1 documented drug interaction in our database — Efavirenz is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Efavirenz interact with any supplements?
Yes. Efavirenz has documented interactions with 159 supplements in our database — Lemon is not one of them. The Efavirenz 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

Lemon monograph Uses, safety profile, and every drug interaction in one place Efavirenz drug information The full plain-English guide to this medication Efavirenz supplement interactions Every supplement checked against Efavirenz, 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 2 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Efavirenz and Lemon?

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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.