Drug & supplement interaction

Lecithin + Ampicillin

Ampicillin brand names: Principen, Omnipen-N, Omnipen, Rimacillin, Penbritin.

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 Lecithin and Ampicillin 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 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

Lecithin and Ampicillin

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 Ampicillin and Lecithin 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 Lecithin at all — not against Ampicillin, 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.

Lecithin safety at a glance

Lecithin overall Generally safe Generally considered safe for most people in food and supplement amounts.
Pregnancy Likely Safe When used orally in food amounts. Lecithin has Generally Recognized As Safe (GRAS) status in the US. There is insufficient reliable information available about... Read the full pregnancy detail
Breastfeeding Likely Safe When used orally in food amounts. Lecithin has Generally Recognized As Safe (GRAS) status in the US. There is insufficient reliable information available about... 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 Ampicillin and Lecithin? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

No Interaction Found — But Data Suggests Lecithin and Ampicillin 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.

  • Diarrhea / Nausea Additional detail

    Lecithin

    “Orally, lecithin may cause abdominal pain, diarrhea, fullness, and nausea.”

    Lecithin · Natural Medicines adverse-effect record, reported in diarrhea.

    6 sources cited
    1. 5140. Buchman AL, Dubin M, Jenden D, et al. Lecithin increases plasma free choline and decreases hepatic steatosis in long-term total parenteral nutrition patients. Gastroenterology 1992;102:1363-70.
    2. 6243. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline (2000). Washington, DC: National Academy Press, 2000. Available at: http://b
    3. 14817. Chatellier G, Lacomblez L. Tacrine (tetrahydroaminoacridine; THA) and lecithin in senile dementia of the Alzheimer type: a multicentre trial. Groupe Francais d'Etude de la Tetrahydroaminoacridine. BMJ 1990;300:495-9.
    4. 14822. Gelenberg AJ, Dorer DJ, Wojcik JD, et al. A crossover study of lecithin treatment of tardive dyskinesia. J Clin Psychiatry 1990;51:149-53.
    5. 14838. Little A, Levy R, Chuaqui-Kidd P, Hand D. A double-blind, placebo controlled trial of high-dose lecithin in Alzheimer's disease. J Neurol Neurosurg Psychiatry 1985;48:736-42. PubMed
    6. 19204. Drachman DA, Glosser G, Fleming P, et al. Memory decline in the aged: treatment with lecithin and physostigmine. Neurology 1982;32:944-50. PubMed

    Ampicillin

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

Reported for Lecithin but not commonly for Ampicillin: stomach pain.

Effects for Ampicillin come from the ADVERSE REACTIONS section of its FDA label; effects for Lecithin 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

Lecithin in Pregnancy & Breastfeeding

Pregnancy And Lactation Likely Safe

When used orally in food amounts. Lecithin has Generally Recognized As Safe (GRAS) status in the US. There is insufficient reliable information available about the safety of medicinal amounts of lecithin during pregnancy or lactation; 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

From our Q&A

Questions About Lecithin or Ampicillin

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Lecithin or Ampicillin, 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 Ampicillin

This page covers Lecithin only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Ampicillin page lists 50 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Bacillus Coagulans (moderate), Bacillus Subtilis (moderate), Bifidobacterium Animalis Subsp. Lactis (moderate) and Bifidobacterium Bifidum (moderate).

By severity: 1 major · 39 moderate · 10 minor.

From our pharmacist’s overview on the Ampicillin page

“An antibiotic only works if enough of it survives the trip through your gut, and that is where ampicillin (Principen, Penbritin) meets real trouble with one supplement in particular. Activated charcoal, the single major-rated entry among the 50 on this page, binds drugs in the digestive tract and can sharply cut how much ampicillin you…”

Reviewed by 2 · Jul 18, 2026

Open the Ampicillin interaction page

One more smart check

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

We hold 2,414 real supplement products containing Lecithin, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Lecithin. Even though Lecithin itself has no known interaction with Ampicillin, 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 Lecithin and Ampicillin 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 Lecithin
Top 10%

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

29 days ago today
Medication Ampicillin
Steady interest

#1,573 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 Lecithin reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Lecithin and Ampicillin 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 Lecithin

What is Lecithin?

  • High cholesterol
  • Liver health
  • Brain and memory support
  • Breast inflammation during breastfeeding (mastitis/clogged ducts)
  • Dry skin and skin conditions

Lecithin is a natural fatty substance found in foods and made by the body that is widely used as a supplement and food emulsifier. Evidence supporting most of its health claims is limited, though it is generally considered safe for most people when taken in normal amounts. Talk to your pharmacist or doctor before starting it, especially if you have allergies to soy or egg.

Fatty substance extracted from soybeans, eggs, or sunflower seeds · Capsules, softgels, granules, powder, liquid, and as a food additive

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

Lecithin: dosing

There is no official standardized dose of lecithin for any health condition. The amount used varies widely depending on the product and the reason for use.The best approach is to follow the directions on the product label and not take more than recommended.

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

Read the full Lecithin monograph & all interactions
Medication

About Ampicillin

What Is Ampicillin Used For?

Brand names: Principen, Omnipen-N, Omnipen, Rimacillin, Penbritin

Ampicillin treats bacterial infections caused by susceptible organisms. It is used for respiratory tract infections, urinary tract infections, gastrointestinal infections (including typhoid fever and dysentery), bacterial meningitis (infection of the membranes surrounding the brain and spinal cord), and serious bloodstream infections such as septicemia and endocarditis (infection of the heart's inner lining).

Ampicillin capsules (oral form) are also indicated for genitourinary tract infections, including gonorrhea caused by non-penicillinase-producing organisms, and meningitis caused by N. meningitidis. The injectable forms (intramuscular or intravenous) are reserved for moderately severe to severe infections or for patients who cannot take oral medication.

See full Ampicillin drug information
Keep checking

Other Drugs & Lecithin

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

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

Lecithin References

The 9 references that drive our Lecithin 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. Buchman AL, Dubin M, Jenden D, et al. Lecithin increases plasma free choline and decreases hepatic steatosis in long-term total parenteral nutrition patients. Gastroenterology 1992;102:1363-70.
  2. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline (2000). Washington, DC: National Academy Press, 2000. Available at: http://b
  3. Chatellier G, Lacomblez L. Tacrine (tetrahydroaminoacridine; THA) and lecithin in senile dementia of the Alzheimer type: a multicentre trial. Groupe Francais d'Etude de la Tetrahydroaminoacridine. BMJ 1990;300:495-9.
  4. Gelenberg AJ, Dorer DJ, Wojcik JD, et al. A crossover study of lecithin treatment of tardive dyskinesia. J Clin Psychiatry 1990;51:149-53.
  5. Little A, Levy R, Chuaqui-Kidd P, Hand D. A double-blind, placebo controlled trial of high-dose lecithin in Alzheimer's disease. J Neurol Neurosurg Psychiatry 1985;48:736-42. PubMed
  6. Palm M, Moneret-Vautrin DA, Kanny G, et al. Food allergy to egg and soy lecithins. Allergy 1999;54:1116-7. PubMed
  7. Drachman DA, Glosser G, Fleming P, et al. Memory decline in the aged: treatment with lecithin and physostigmine. Neurology 1982;32:944-50. PubMed
  8. Gelenberg, A. J., Doller-Wojcik, J. C., and Growdon, J. H. Choline and lecithin in the treatment of tardive dyskinesia: preliminary results from a pilot study. Am J Psychiatry 1979;136(6):772-776. PubMed
  9. Electronic Code of Federal Regulations. Title 21, Chapter 1, Subchapter B, Part 184: Direct food substances affirmed as Generally Recognized as Safe. Subpart B - listing of specific substances affirmed as GRAS. Sec. 184.1400 Lecithin. Available at: https:

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 Lecithin and Ampicillin Together: Common Questions

Is it safe to take Lecithin with Ampicillin?
We do not list a known interaction between Lecithin and Ampicillin. 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 Lecithin and Ampicillin have any of the same side effects?
Yes — our sources link each of them separately to 2 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.
Does Ampicillin interact with any supplements?
Yes. Ampicillin has documented interactions with 50 supplements in our database — Lecithin is not one of them. The Ampicillin 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

Lecithin monograph Uses, safety profile, and every drug interaction in one place Ampicillin drug information The full plain-English guide to this medication Ampicillin supplement interactions Every supplement checked against Ampicillin, 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 9 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Ampicillin and Lecithin?

Our pharmacists answer your medication & supplement questions — free.

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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.