Drug & supplement interaction

Strophanthus + Pegvaliase-Pqpz

Pegvaliase-Pqpz brand name: Palynziq.

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 Pegvaliase-Pqpz 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

Strophanthus and Pegvaliase-Pqpz

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 Pegvaliase-Pqpz 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 Pegvaliase-Pqpz and Strophanthus? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
Keep it in perspective

Strophanthus Does Interact With Other Medications

Strophanthus has 3 major, 120 moderate known drug interactions in our database — Pegvaliase-Pqpz 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. Pegvaliase-Pqpz)
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

No Interaction Found — But Data Suggests Strophanthus and Pegvaliase-Pqpz 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.

  • Headache reported in 5.4% of FDA reports for Pegvaliase-Pqpz Additional detail

    Strophanthus

    “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 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.

    Pegvaliase-Pqpz

    Listed in the ADVERSE REACTIONS section of the FDA label for Pegvaliase-Pqpz, and in voluntary FDA adverse-event reports. Read the label on DailyMed ›

  • Vomiting / Nausea Additional detail

    Strophanthus

    “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.

    Pegvaliase-Pqpz

    Listed in the ADVERSE REACTIONS section of the FDA label for Pegvaliase-Pqpz. Read the label on DailyMed ›

Reported for Strophanthus but not commonly for Pegvaliase-Pqpz: an irregular heartbeat.

Effects for Pegvaliase-Pqpz come from the ADVERSE REACTIONS section of its FDA label; effects for Strophanthus come from the Natural Medicines adverse-effect record, quoted above. Where a percentage is shown, it is the share of 7,922 voluntary FDA FAERS reports for Pegvaliase-Pqpz that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

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 much people look this up

Where Strophanthus and Pegvaliase-Pqpz 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

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

29 days ago today
Medication Pegvaliase-Pqpz
Top 25%

#378 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 Pegvaliase-Pqpz 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
Medication

About Pegvaliase-pqpz Injection

What Is Pegvaliase-pqpz Injection Used For?

Brand name: Palynziq

Palynziq is used to reduce blood phenylalanine (Phe) concentrations in adults and pediatric patients 12 years of age and older who have phenylketonuria (PKU) — a genetic condition in which the body cannot break down the amino acid phenylalanine properly. It is specifically for patients whose blood phenylalanine levels remain above 600 micromol/L despite existing management.

Palynziq does not cure PKU, but it works alongside dietary management to bring dangerously high phenylalanine levels down to a safer range.

Most-Reported Side Effects for Pegvaliase-Pqpz

From FAERS, the FDA’s public side-effect reporting system (8,167 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Arthralgia 1,395 reports
Injection site reaction 908 reports
Injection site erythema 750 reports
Injection site swelling 554 reports
Rash 507 reports
See full Pegvaliase-pqpz Injection drug information
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 Pegvaliase-Pqpz, 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 Pegvaliase-Pqpz Together: Common Questions

Is it safe to take Strophanthus with Pegvaliase-Pqpz?
We do not list a known interaction between Strophanthus and Pegvaliase-Pqpz. 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 Strophanthus and Pegvaliase-Pqpz have any of the same side effects?
Yes — our sources link each of them separately to 3 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 Strophanthus interact with any other medications?
Yes. Strophanthus has 123 documented drug interactions in our database — Pegvaliase-Pqpz is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.

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 Pegvaliase-pqpz Injection drug information The full plain-English guide to this medication Pegvaliase-Pqpz supplement interactions Every supplement checked against Pegvaliase-Pqpz, 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 Pegvaliase-Pqpz 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.