Drug & supplement interaction

Sweet Annie + Peginterferon alfa-2b

Peginterferon alfa-2b brand names: Peg-Intron, ViraferonPeg.

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

Sweet Annie has a moderate interaction with Peginterferon alfa-2b. Theoretically, concomitant use might have additive adverse hepatotoxic effects.

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

Sweet Annie and Peginterferon alfa-2b

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

Moderate

HEPATOTOXIC DRUGS

Why this applies to Peginterferon alfa-2b

Peginterferon alfa-2b falls under HEPATOTOXIC DRUGS — the group Sweet Annie interacts with.

Theoretically, concomitant use might have additive adverse hepatotoxic effects.
There is some concern that Sweet Annie can adversely affect the liver.
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 simple version: peginterferon alfa-2b is a long-acting injection that fights hepatitis C, and one of the things your care team watches closely while you're on it is your liver. The medicine itself can stress liver enzymes, which is why you get regular blood tests. Sweet Annie (Artemisia annua) has its own reports of being hard on the liver, so the worry is that stacking the two could add up and put more strain on an already busy organ.

To be straight with you, this concern is theoretical and based mostly on anecdotal reports, not strong studies. Still, since you're treating a liver condition, I'd play it safe. Don't start or stop anything on your own. Check with your doctor or pharmacist first so they can keep an eye on your liver labs.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Centers for Disease Control and Prevention (CDC). Hepatitis temporally associated with an herbal supplement containing artemisinin-Washington, 2008. MMWR Morb Mortal Wkly Rep 2009;58:854-8.
  2. Savage RL, Hill GR, Barnes J, Kenyon SH, Tatley MV. Suspected hepatotoxicity with a supercritical carbon dioxide extract of Artemisia annua in grapeseed oil used in New Zealand. Front Pharmacol. 2019;10:1448. PubMed
  3. Ruperti-Repilado FJ, Haefliger S, Rehm S, et al. Danger of herbal tea: a case of acute cholestatic hepatitis due to Artemisia annua tea. Front Med (Lausanne). 2019;6:221. PubMed

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

Sweet Annie Also Interacts With Other Medications

Sweet Annie has 888 moderate known drug interactions in our database — the Peginterferon alfa-2b one above is one of them. If you take anything else, check it against the full list below.

Moderate 888 No known interaction 1,942 (incl. Peginterferon alfa-2b)
Taking anything else?

Check Another of Your Medications Against Sweet Annie

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

Everything else you take

See Every Supplement That Interacts With Peginterferon alfa-2b

This page covers Sweet Annie only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Peginterferon alfa-2b page lists 38 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Beer (major), Siberian Cocklebur (major), Wine (major), Ashwagandha (moderate) and Black Cohosh (moderate).

By severity: 3 major · 35 moderate.

From our pharmacist’s overview on the Peginterferon alfa-2b page

“Someone taking peginterferon alfa-2b (Peg-Intron) is usually treating hepatitis C, so the liver is already the organ under strain, and all 38 supplement interactions on file for this drug pile additional liver stress on top of it. That earns genuine caution.”

Reviewed by 2 · Jul 18, 2026

Open the Peginterferon alfa-2b interaction page

One more smart check

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

We hold 243 real supplement products containing Sweet Annie, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Sweet Annie. Your product may carry other ingredients that interact with Peginterferon alfa-2b too, on top of Sweet Annie — 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 Sweet Annie and Peginterferon alfa-2b 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 Sweet Annie
Top half

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

29 days ago today
Medication Peginterferon alfa-2b
Steady interest

#1,894 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 Sweet Annie

What is Sweet Annie?

Sweet Annie
  • Malaria (traditional)
  • Fever
  • Inflammation
  • Digestive complaints
  • Antimicrobial support
  • Insect repellent

Sweet Annie (Artemisia annua) is the source of artemisinin, a compound used in prescription antimalarial drugs. While the purified drug is well studied for malaria, the herb itself as a supplement is not proven for the wide range of conditions people use it for, and self-treating malaria with the raw herb is dangerous. Talk to a pharmacist or doctor before using it.

Read the full Sweet Annie monograph & all interactions
Medication

About Peginterferon Alfa-2b (PEG-Intron)

What Is Peginterferon Alfa-2b (PEG-Intron) Used For?

Brand names: Peg-Intron, ViraferonPeg

  • Peginterferon alfa-2b is used alone or in combination with ribavirin (a medication) to treat chronic (long-term) hepatitis C infection (swelling of the liver caused by a virus) in people who show signs of liver damage and who have not been treated with interferon alpha (medication similar to peginterferon alfa-2b) in the past. Peginterferon alfa-2b is in a class of medications called interferons. Peginterferon alfa-2b is a combination of interferon and polyethylene glycol, which helps the interferon stay active in your body for a longer period of time. Peginterferon alpha-2b works by decreasing the amount of hepatitis C virus (HCV) in the body. Peginterferon alfa-2b may not cure hepatitis C or prevent you from developing complications of hepatitis C such as cirrhosis (scarring) of the liver, liver failure, or liver cancer. Peginterferon alfa-2b may not prevent the spread of hepatitis C to other people.

See full Peginterferon Alfa-2b (PEG-Intron) drug information
Keep checking

Other Drugs & Sweet Annie

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

0Major
888Moderate
0Minor
1,941No known interaction
888 Moderate 1,941 No interaction
Moderate

888 interactions

Showing 60 of 888 moderate interactions — see all 888 on the Sweet Annie page.

No interaction 1,941 drugs checked — show the list

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

Showing the 60 most looked-up of 1,941 medications checked with no known interaction — see the full Sweet Annie list.

See the full Sweet Annie interactions page
See every supplement checked against Peginterferon alfa-2b, 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
Sweet Annie monograph › Uses, safety, and every drug interaction in one place Peginterferon alfa-2b supplement interactions › Every supplement checked against Peginterferon alfa-2b, ranked by severity Peginterferon Alfa-2b (PEG-Intron) 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 Sweet Annie and Peginterferon alfa-2b Together: Common Questions

Can you take Sweet Annie with Peginterferon alfa-2b?
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 Sweet Annie and Peginterferon alfa-2b 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 Peginterferon alfa-2b and Sweet Annie?

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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.