Drug & supplement interaction

Astragalus + Palivizumab

Palivizumab brand name: Synagis.

Moderate Interaction
Medically reviewed by · Updated September 2026
The bottom line Moderate

Astragalus has a moderate interaction with Palivizumab. Theoretically, astragalus might interfere with immunosuppressive therapy.

Read the full interaction report
SeverityModerate
LikelihoodPossible
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

Astragalus and Palivizumab

Here is the interaction we found between these two, with the evidence behind it.

Moderate

IMMUNOSUPPRESSANTS

Why this applies to Palivizumab

Palivizumab falls under IMMUNOSUPPRESSANTS — the group Astragalus interacts with.

Theoretically, astragalus might interfere with immunosuppressive therapy.
Astragalus seems to stimulate immune function. Theoretically, taking astragalus might decrease the effects of immunosuppressive therapy.
Severity Moderate Likelihood Possible Evidence D

Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the thinking behind this pairing. Astragalus is believed to rev up the immune system, while medicines on the immunosuppressant list work by calming the immune system down. So in theory, the two could pull in opposite directions, and astragalus might blunt that calming effect.

But Synagis (palivizumab) doesn't really fit that mold. It isn't a true immunosuppressant. It's a monoclonal antibody given as a seasonal shot to help protect high-risk babies from RSV by targeting the virus directly, not by quieting the immune system. So this theoretical concern likely doesn't apply the same way here. On top of that, the evidence is only lab and animal based. Since this is given to infants, please run any supplement question by your pediatrician or pharmacist first.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Upton R, ed. Astragalus Root: Analytical, quality control, and therapeutic monograph. Santa Cruz, CA: American Herbal Pharmacopoeia. 1999:1-25.
  2. Sun Y, Hersh EM, Lee SL, et al. Preliminary observations on the effects of the Chinese medicinal herbs Astragalus membranaceus and Ligustrum lucidum on lymphocyte blastogenic responses. J Biol Response Mod 1983;2:227-37..

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Astragalus Also Interacts With Other Medications

Astragalus has 207 moderate known drug interactions in our database — the Palivizumab one above is one of them. If you take anything else, check it against the full list below.

Moderate 207 No known interaction 2,623 (incl. Palivizumab)
Taking anything else?

Check Another of Your Medications Against Astragalus

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

From our Q&A

Questions About Astragalus or Palivizumab

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

This page covers Astragalus only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Palivizumab page lists 53 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Active Hexose Correlated Compound (ahcc) (moderate), Alfalfa (moderate), American Ginseng (moderate), Andrographis (moderate) and Ashwagandha (moderate).

By severity: 52 moderate · 1 minor.

From our pharmacist’s overview on the Palivizumab page

“Everything on this list for palivizumab (Synagis), the antibody injection given monthly to shield premature and other high-risk infants from RSV, points in one direction. These are supplements that stimulate the immune system, and stimulating the immune system could in theory work against a medicine that acts on it.”

Reviewed by 2 · Jul 18, 2026

Open the Palivizumab interaction page

One more smart check

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

We hold 3,437 real supplement products containing Astragalus, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Astragalus. Your product may carry other ingredients that interact with Palivizumab too, on top of Astragalus — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Astragalus and Palivizumab 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 Astragalus
Top 5%

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

29 days ago today
Medication Palivizumab
Steady interest

#1,944 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.

Supplement

About Astragalus

What is Astragalus?

Astragalus
  • Immune support
  • Colds and flu
  • Upper respiratory infections
  • Fatigue and stress (adaptogen)
  • Heart health
  • General wellness in traditional medicine

Astragalus is a root used for centuries in traditional Chinese medicine, mainly to support the immune system and help the body cope with stress. While early studies are interesting, strong human evidence for most uses is still lacking. It is generally well tolerated by healthy adults for short-term use, but should be avoided during pregnancy and breastfeeding due to limited safety data.

Read the full Astragalus monograph & all interactions
Medication

About Palivizumab Injection

What Is Palivizumab Injection Used For?

Brand name: Synagis

Synagis (palivizumab) is used to prevent serious lower respiratory tract disease caused by RSV — not to treat an infection that has already started. It is given to high-risk babies and young children before and during RSV season.

Synagis is approved for infants born at 35 weeks gestation or earlier who are 6 months old or younger at the start of RSV season; children up to 24 months old with bronchopulmonary dysplasia (BPD, a chronic lung condition) who needed medical treatment in the past 6 months; and children up to 24 months old with hemodynamically significant congenital heart disease (a heart defect that affects blood flow).

See full Palivizumab Injection drug information
Keep checking

Other Drugs & Astragalus

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

0Major
207Moderate
0Minor
2,622No known interaction
207 Moderate 2,622 No interaction
Moderate

207 interactions

Showing 60 of 207 moderate interactions — see all 207 on the Astragalus page.

No interaction 2,622 drugs checked — show the list

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

Showing the 60 most looked-up of 2,622 medications checked with no known interaction — see the full Astragalus list.

See the full Astragalus interactions page
See every supplement checked against Palivizumab, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Astragalus monograph › Uses, safety, and every drug interaction in one place Palivizumab supplement interactions › Every supplement checked against Palivizumab, ranked by severity Palivizumab Injection drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Astragalus and Palivizumab Together: Common Questions

Can you take Astragalus with Palivizumab?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Astragalus and Palivizumab interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Still Have a Question About Palivizumab and Astragalus?

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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.