Drug & supplement interaction

Strophanthus + Ethinyl Estradiol, Norethindrone

Ethinyl Estradiol, Norethindrone brand names: Femhrt, Loestrin 21, Ovcon 35 21, Ovcon 50 28, Necon 0.5 35 21, and others.

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 Strophanthus and Ethinyl Estradiol, Norethindrone 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 Ethinyl Estradiol, Norethindrone states a food rule worth keeping to.

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Interaction report

Strophanthus and Ethinyl Estradiol, Norethindrone

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 Ethinyl Estradiol, Norethindrone and Strophanthus 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.

Strophanthus safety at a glance

Strophanthus overall Avoid Strophanthus contains potent, potentially toxic cardiac glycosides and should only be used under direct medical supervision.
Pregnancy Unsafe When used orally due to possible uterine stimulating effects; avoid using. Read the full pregnancy detail
Breastfeeding Unsafe When used orally; avoid using. 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 Ethinyl Estradiol, Norethindrone and Strophanthus? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Ethinyl Estradiol, Norethindrone

Interactions in our licensed database are recorded against drug classes, not just single drug names. Ethinyl Estradiol, Norethindrone is filed under 13 classifications — including progestin, contraceptive drugs, estrogens. Strophanthus has documented interactions with 6 drug classes — the most serious being quinidine (major), quinine (major) and corticosteroids (moderate) — and none of Ethinyl Estradiol, Norethindrone’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

Strophanthus Does Interact With Other Medications

Strophanthus has 3 major, 120 moderate known drug interactions in our database — Ethinyl Estradiol, Norethindrone isn’t one of them. If you take anything else, check it against the full list below.

Major 3 Moderate 120 No known interaction 2,707 (incl. Ethinyl Estradiol, Norethindrone)
Taking anything else?

Check Another of Your Medications Against Strophanthus

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

What to actually watch for

What Strophanthus Itself Has Been Linked To

This is not an interaction — nothing below involves Ethinyl Estradiol, Norethindrone. It is the side-effect record for Strophanthus on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Strophanthus, this list is the first place to look. One entry is worth acting on rather than waiting out — marked below.

  • An irregular heartbeat Worth acting on Additional detail

    “Orally, side effects include nausea, vomiting, headache, stupor, disturbance of color vision, and cardiac arrhythmias, particularly during overdose (18).”

    Strophanthus · Natural Medicines adverse-effect record, reported in arrhythmia.

    1 source cited
    1. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.

    “Orally, side effects include cardiac arrhythmias (18).”

    Strophanthus · Natural Medicines adverse-effect record, reported in arrhythmia.

    1 source cited
    1. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
  • Vomiting / Nausea Additional detail

    “Orally, side effects include nausea and vomiting (18).”

    Strophanthus · Natural Medicines adverse-effect record, reported in nausea and vomiting.

    1 source cited
    1. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
  • Headache Additional detail

    “Orally, side effects include headache, stupor, and disturbance of color vision (18).”

    Strophanthus · Natural Medicines adverse-effect record, reported in cluster headache.

    1 source cited
    1. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.

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

Special populations

Strophanthus in Pregnancy & Breastfeeding

Pregnancy Unsafe

When used orally due to possible uterine stimulating effects; avoid using.

Lactation Unsafe

When used orally; 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

How to take them

Some Ethinyl Estradiol, Norethindrone Products Have a Food Rule — Strophanthus Should Not Break It

At least one FDA label for a product containing Ethinyl Estradiol, Norethindrone says to take it with food. If you take Strophanthus on an empty stomach out of habit, keep them separate — and take Ethinyl Estradiol, Norethindrone 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 Ethinyl Estradiol, Norethindrone 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.

Tablets should be taken regularly with a meal or at bedtime.

From the Dosage and Administration section of the FDA label we read for Ethinyl Estradiol, Norethindrone — where that label names a specific product, the instruction is that product's.

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 Ethinyl Estradiol, Norethindrone

This page covers Strophanthus only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Ethinyl Estradiol, Norethindrone page lists 240 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Beer (major), Grapefruit (major), Siberian Cocklebur (major) and St. John's Wort (major).

By severity: 6 major · 196 moderate · 38 minor.

From our pharmacist’s overview on the Ethinyl Estradiol, Norethindrone page

“If you take a birth control pill or hormone therapy containing ethinyl estradiol and norethindrone (Loestrin, Femhrt, and others), a few supplements can genuinely undermine it, so read this page with care. Six of the 240 ingredients on file are rated major, and those six come first.”

Reviewed by 2 · Jul 18, 2026

Open the Ethinyl Estradiol, Norethindrone interaction page

How much people look this up

Where Strophanthus and Ethinyl Estradiol, Norethindrone 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 Strophanthus
Steady interest

#1,061 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Ethinyl Estradiol, Norethindrone
Top 10%

#237 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 Strophanthus reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Strophanthus and Ethinyl Estradiol, Norethindrone records this page draws on were last updated July 11, 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 Strophanthus

What is Strophanthus?

  • Heart failure
  • Angina (chest pain)
  • Irregular heartbeat
  • Circulation support
  • Traditional African arrow poison (historical)

Strophanthus is a plant that contains powerful heart-affecting compounds called cardiac glycosides (the best known is ouabain/g-strophanthin). Because these substances can strongly affect heart rhythm and are toxic in the wrong amount, Strophanthus is not a casual supplement and should never be used without close medical supervision. Reliable modern evidence for its supplement use is limited.

Strophanthus gratus · Apocynaceae · Seeds (and the seed-derived glycoside ouabain/g-strophanthin) · Oral drops/tinctures, capsules, and historically injectable extracts (mostly outside the U.S.)

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

Strophanthus: dosing

There is no well-established, standardized supplement dose for Strophanthus, and the strength of products can vary a lot. Because the active glycosides are potent and potentially toxic, picking a dose on your own is not safe.If a product is used, follow the exact directions on the label and use it only under the supervision of a qualified healthcare provider. We deliberately do not list specific milligram amounts here.

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

Read the full Strophanthus monograph & all interactions
Keep checking

Other Drugs & Strophanthus

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

3Major
120Moderate
0Minor
2,706No known interaction
3 Major 120 Moderate 2,706 No interaction
Major

3 interactions

Moderate

120 interactions

Showing 60 of 120 moderate interactions — see all 120 on the Strophanthus page.

No interaction 2,706 drugs checked — show the list

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

Showing the 60 most looked-up of 2,706 medications checked with no known interaction — see the full Strophanthus list.

See the full Strophanthus interactions page
See every supplement checked against Ethinyl Estradiol, Norethindrone, ranked by severity
Evidence & sources

Strophanthus References

The 4 references that drive our Strophanthus 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. Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.
  2. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
  3. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  4. Tyler VE, Brady LR, Robbers JE. Pharmacognosy. 9th ed. Philadelphia, PA: Lea & Febiger, 1988.

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 Strophanthus and Ethinyl Estradiol, Norethindrone Together: Common Questions

Is it safe to take Strophanthus with Ethinyl Estradiol, Norethindrone?
We do not list a known interaction between Strophanthus and Ethinyl Estradiol, Norethindrone. 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 Strophanthus and Ethinyl Estradiol, Norethindrone at the same time of day?
At least one FDA label for a product containing Ethinyl Estradiol, Norethindrone says to take it with food. If you take Strophanthus on an empty stomach out of habit, keep them separate and take Ethinyl Estradiol, Norethindrone with a meal where the label says to. Food instructions belong to the product rather than the ingredient — two Ethinyl Estradiol, Norethindrone products can differ — so check the directions on your own box. This is about absorption, not an interaction.
How was the Strophanthus and Ethinyl Estradiol, Norethindrone combination checked?
Interactions in our licensed database are recorded against drug classes. Ethinyl Estradiol, Norethindrone is filed under 13 classifications, and Strophanthus has documented interactions with 6 drug classes — none of Ethinyl Estradiol, Norethindrone'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 Strophanthus interact with any other medications?
Yes. Strophanthus has 123 documented drug interactions in our database — Ethinyl Estradiol, Norethindrone 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 Ethinyl Estradiol, Norethindrone interact with any supplements?
Yes. Ethinyl Estradiol, Norethindrone has documented interactions with 240 supplements in our database — Strophanthus is not one of them. The Ethinyl Estradiol, Norethindrone 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

Strophanthus monograph Uses, safety profile, and every drug interaction in one place Ethinyl Estradiol, Norethindrone supplement interactions Every supplement checked against Ethinyl Estradiol, Norethindrone, 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 4 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Ethinyl Estradiol, Norethindrone and Strophanthus?

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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.