Drug & supplement interaction

Chitosan + Ombitasvir, Paritaprevir Ritonavir

Ombitasvir, Paritaprevir Ritonavir brand name: Technivie.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Oct 4, 2026
The bottom line No known interaction

We found no known interaction between Chitosan and Ombitasvir, Paritaprevir Ritonavir 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.

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Interaction report

Chitosan and Ombitasvir, Paritaprevir Ritonavir

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 Ombitasvir, Paritaprevir Ritonavir and Chitosan 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.

Chitosan safety at a glance

Chitosan overall Use caution Generally well tolerated short-term, but quality evidence is limited and shellfish allergy is a concern.
Pregnancy Avoid Not enough safety data; avoid use during pregnancy.
Breastfeeding Avoid Not enough safety data; avoid use while breastfeeding.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Ombitasvir, Paritaprevir Ritonavir and Chitosan? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Ombitasvir, Paritaprevir Ritonavir

Interactions in our licensed database are recorded against drug classes, not just single drug names. Ombitasvir, Paritaprevir Ritonavir is filed under 7 classifications — including cytochrome p450 3a4 (cyp3a4) inhibitors, p-glycoprotein substrates, cytochrome p450 3a4 (cyp3a4) substrates. Chitosan has documented interactions with 2 drug classes — the most serious being acyclovir (zovirax) (moderate) and warfarin (coumadin) (moderate) — and none of Ombitasvir, Paritaprevir Ritonavir’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

Chitosan Does Interact With Other Medications

Chitosan has 3 moderate known drug interactions in our database — Ombitasvir, Paritaprevir Ritonavir isn’t one of them. If you take anything else, check it against the full list below.

Moderate 3 No known interaction 2,827 (incl. Ombitasvir, Paritaprevir Ritonavir)
Taking anything else?

Check Another of Your Medications Against Chitosan

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

What to actually watch for

What Chitosan Itself Has Been Linked To

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

  • Kidney problems Worth acting on Additional detail

    “In one clinical trial, a subject with kidney failure reported itching during 12 weeks of oral chitosan treatment. It is not clear if this was related to the underlying renal failure or the use of oral chitosan.”

    Chitosan · Natural Medicines adverse-effect record, reported in kidney failure.

    1 source cited
    1. 1942. Jing SB, Li L, Ji D, et al. Effect of chitosan on renal function in patients with chronic renal failure. J Pharm Pharmacol 1997;49:721-3. PubMed
  • Bloating or gas / Stomach upset / Constipation / Diarrhea / Nausea Additional detail

    “Orally, chitosan has been reported to cause epigastric discomfort, constipation, flatulence, diarrhea, nausea, and dryness of the throat. Excessive discharge of fat in the feces, also known as steatorrhea, has been reported with chitosan therapy.”

    Chitosan · Natural Medicines adverse-effect record, reported in constipation.

    6 sources cited
    1. 1942. Jing SB, Li L, Ji D, et al. Effect of chitosan on renal function in patients with chronic renal failure. J Pharm Pharmacol 1997;49:721-3. PubMed
    2. 3243. Pittler MH, Abbot NC, Harkness EF, Ernst E. Randomized, double-blind trial of chitosan for body weight reduction. Eur J Clin Nutr 1999;53:379-81. PubMed
    3. 9986. Ho SC, Tai ES, Eng PH, et al. In the absence of dietary surveillance, chitosan does not reduce plasma lipids or obesity in hypercholesterolaemic obese Asian subjects. Singapore Med J 2001;42:6-10.
    4. 11307. Bokura H, Kobayashi S. Chitosan decreases total cholesterol in women: a randomized, double-blind, placebo-controlled trial. Eur J Clin Nutr 2003;57:721-5. PubMed
    5. 14314. Mhurchu CN, Poppitt SD, McGill AT, et al. The effect of the dietary supplement, Chitosan, on body weight: a randomised controlled trial in 250 overweight and obese adults. Int J Obes Relat Metab Disord 2004;28:1149-56. PubMed
    6. 41688. Wuolijoki, E., Hirvela, T., and Ylitalo, P. Decrease in serum LDL cholesterol with microcrystalline chitosan. Methods Find.Exp Clin Pharmacol. 1999;21(5):357-361. PubMed
  • Itching Additional detail

    “Topically, an eye drop containing chitosan-N-acetylcysteine has been reported to cause itching and irritation of the eyes.”

    Chitosan · Natural Medicines adverse-effect record, reported in pruritus.

    1 source cited
    1. 97710. Schmidl D, Werkmeister R, Kaya S, et al. A Controlled, Randomized Double-Blind Study to Evaluate the Safety and Efficacy of Chitosan-N-Acetylcysteine for the Treatment of Dry Eye Syndrome. J Ocul Pharmacol Ther. 2017;33(5):375-382.

Everything above comes from the Natural Medicines adverse-effect record for Chitosan — expand a row for the licensed statement it rests on. We haven’t matched Ombitasvir, Paritaprevir Ritonavir to its FDA label in our system yet, so we can’t compare its own side-effect list here — the leaflet that comes with your prescription is the authoritative list for Ombitasvir, Paritaprevir Ritonavir.

Everything else you take

See Every Supplement That Interacts With Ombitasvir, Paritaprevir Ritonavir

This page covers Chitosan only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Ombitasvir, Paritaprevir Ritonavir page lists 154 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Grapefruit (major), St. John's Wort (major), 1,4-butanediol (moderate) and Acacia Rigidula (moderate).

By severity: 3 major · 113 moderate · 38 minor.

From our pharmacist’s overview on the Ombitasvir, Paritaprevir Ritonavir page

“Technivie (ombitasvir, paritaprevir, and ritonavir) treats hepatitis C, and because a cure depends on holding steady drug levels for the whole course, this list warrants genuine care. Most of the 154 ingredients on file touch the CYP3A4 enzyme pathway, meaning they can push the drug's blood levels up or down.”

Reviewed by 2 · Jul 18, 2026

Open the Ombitasvir, Paritaprevir Ritonavir interaction page

One more smart check

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

We hold 167 real supplement products containing Chitosan, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Chitosan. Even though Chitosan itself has no known interaction with Ombitasvir, Paritaprevir Ritonavir, 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 Chitosan and Ombitasvir, Paritaprevir Ritonavir 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 Chitosan
Top half

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

29 days ago today
Medication Ombitasvir, Paritaprevir Ritonavir
Top 10%

#158 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 Chitosan reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified October 4, 2026. The Chitosan and Ombitasvir, Paritaprevir Ritonavir 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 Chitosan

What is Chitosan?

Chitosan
  • Weight management
  • Lowering cholesterol
  • Wound care
  • General digestive supplement

Chitosan is a fiber-like substance made from the shells of shrimp, crabs, and other shellfish, often marketed for weight loss and cholesterol. The evidence for these benefits is weak, and any effects appear small at best. It is generally well tolerated for short-term use, but people with shellfish allergies and those who are pregnant or breastfeeding should be cautious.

Shells of crustaceans (the source of chitin, which is processed into chitosan) · Capsules, tablets, powder

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

Chitosan: dosing

There is no official standardized dose for chitosan, and amounts used in studies have varied widely. Because of this, it is best to follow the directions on the product label and not exceed them.Chitosan is often taken with meals and a full glass of water.

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

Read the full Chitosan monograph & all interactions
Medication

About Ombitasvir, Paritaprevir, and Ritonavir

What Is Ombitasvir, Paritaprevir, and Ritonavir Used For?

Brand name: Technivie

  • The combination of ombitasvir, paritaprevir, and ritonavir is usually used in combination with ribavirin (Copegus, Rebetol), but sometimes it is used alone to treat a certain type of chronic (long-term) hepatitis C infection (swelling of the liver caused by a virus). Ombitasvir is a hepatitis C virus (HCV) NS5A inhibitor. It works by stopping the virus that causes hepatitis C from spreading inside the body. Paritaprevir is a protease inhibitor. It works by decreasing the amount of HCV in the body. Ritonavir is a protease inhibitor. It helps to increase the amount of paritaprevir in the body so that the medication will have a greater effect. It is not known if ombitasvir, paritaprevir, or ritonavir prevent the spread of hepatitis C to other people.

See full Ombitasvir, Paritaprevir, and Ritonavir drug information
Keep checking

Other Drugs & Chitosan

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

0Major
3Moderate
0Minor
2,826No known interaction
3 Moderate 2,826 No interaction
Moderate

3 interactions

No interaction 2,826 drugs checked — show the list

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

Showing the 60 most looked-up of 2,826 medications checked with no known interaction — see the full Chitosan list.

See the full Chitosan interactions page
See every supplement checked against Ombitasvir, Paritaprevir Ritonavir, ranked by severity
Evidence & sources

Chitosan References

The 17 references that drive our Chitosan 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. Jing SB, Li L, Ji D, et al. Effect of chitosan on renal function in patients with chronic renal failure. J Pharm Pharmacol 1997;49:721-3. PubMed
  2. Pittler MH, Abbot NC, Harkness EF, Ernst E. Randomized, double-blind trial of chitosan for body weight reduction. Eur J Clin Nutr 1999;53:379-81. PubMed
  3. Ho SC, Tai ES, Eng PH, et al. In the absence of dietary surveillance, chitosan does not reduce plasma lipids or obesity in hypercholesterolaemic obese Asian subjects. Singapore Med J 2001;42:6-10.
  4. Bokura H, Kobayashi S. Chitosan decreases total cholesterol in women: a randomized, double-blind, placebo-controlled trial. Eur J Clin Nutr 2003;57:721-5. PubMed
  5. Mhurchu CN, Poppitt SD, McGill AT, et al. The effect of the dietary supplement, Chitosan, on body weight: a randomised controlled trial in 250 overweight and obese adults. Int J Obes Relat Metab Disord 2004;28:1149-56. PubMed
  6. Huang SS, Sung SH, Chiang CE. Chitosan potentiation of warfarin effect. Ann Pharmacother 2007;41:1912-4. PubMed
  7. Tsai, G. J. and Su, W. H. Antibacterial activity of shrimp chitosan against Escherichia coli. J Food Prot. 1999;62(3):239-243. PubMed
  8. Wuolijoki, E., Hirvela, T., and Ylitalo, P. Decrease in serum LDL cholesterol with microcrystalline chitosan. Methods Find.Exp Clin Pharmacol. 1999;21(5):357-361. PubMed
  9. Nelson, J. L., Alexander, J. W., Gianotti, L., Chalk, C. L., and Pyles, T. Influence of dietary fiber on microbial growth in vitro and bacterial translocation after burn injury in mice. Nutrition 1994;10(1):32-36.
  10. Schiller RN, Barrager E, Schauss EA, and et al. A randomized, double-blind, placebo-controlled study examining the effects of a rapidly soluble chitosan dietary supplement on weight loss and body composition in overweight and mildly obese individuals. J
  11. Koide, S. S. Chitin-chitosan: properties, benefits and risks. Nutrition Research 1998;8(6):1091-1101. DOI
  12. Maezaki Y, Tsuji K, Nakawa, and et al. Hypocholesterolaemic effect of chitosan in adult males. Biosc Biochem Biotech 1993;57:1439-1444.
  13. Kubbinga M, Nguyen MA, Staubach P, et al. The influence of chitosan on the oral bioavailability of acyclovir-a comparative bioavailability study in humans. Pharm Res 2015;32(7):2241-9. PubMed
  14. Jull AB, Ni Mhurchu C, Bennett DA, et al. Chitosan for overweight or obesity. Cochrane Database Syst Rev 2008;(3):CD003892. PubMed
  15. Schmidl D, Werkmeister R, Kaya S, et al. A Controlled, Randomized Double-Blind Study to Evaluate the Safety and Efficacy of Chitosan-N-Acetylcysteine for the Treatment of Dry Eye Syndrome. J Ocul Pharmacol Ther. 2017;33(5):375-382.

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 Chitosan and Ombitasvir, Paritaprevir Ritonavir Together: Common Questions

Is it safe to take Chitosan with Ombitasvir, Paritaprevir Ritonavir?
We do not list a known interaction between Chitosan and Ombitasvir, Paritaprevir Ritonavir. 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.
How was the Chitosan and Ombitasvir, Paritaprevir Ritonavir combination checked?
Interactions in our licensed database are recorded against drug classes. Ombitasvir, Paritaprevir Ritonavir is filed under 7 classifications, and Chitosan has documented interactions with 2 drug classes — none of Ombitasvir, Paritaprevir Ritonavir'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 Chitosan interact with any other medications?
Yes. Chitosan has 3 documented drug interactions in our database — Ombitasvir, Paritaprevir Ritonavir 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 Ombitasvir, Paritaprevir Ritonavir interact with any supplements?
Yes. Ombitasvir, Paritaprevir Ritonavir has documented interactions with 154 supplements in our database — Chitosan is not one of them. The Ombitasvir, Paritaprevir Ritonavir 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

Chitosan monograph Uses, safety profile, and every drug interaction in one place Ombitasvir, Paritaprevir, and Ritonavir drug information The full plain-English guide to this medication Ombitasvir, Paritaprevir Ritonavir supplement interactions Every supplement checked against Ombitasvir, Paritaprevir Ritonavir, 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 17 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Ombitasvir, Paritaprevir Ritonavir and Chitosan?

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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.