Herb & supplement monograph

Chondroitin Sulfate Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Chondroitin Sulfate interacts with medications. The heart of this page is the interaction list — every drug Chondroitin Sulfate is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Chondroitin Sulfate is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Interaction report

Drugs that interact with Chondroitin Sulfate

2 medications have a known interaction with Chondroitin Sulfate, graded by severity. Select any drug for the full evidence-based detail.

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AI summaries are generated from our Chondroitin Sulfate interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

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What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction 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.
Possible. 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
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Chondroitin Sulfate combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Chondroitin Sulfate affects

Every type of medication (drug category) Chondroitin Sulfate is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 1 drug category Chondroitin Sulfate interacts with

Warfarin (coumadin)

Warfarin (Coumadin)

Taking chondroitin in combination with glucosamine might increase the anticoagulant effects of warfarin. However, the effect of chondroitin alone is unclear.
There have been multiple reports of increased international normalized ratio (INR) in patients taking warfarin with glucosamine, with or without chondroitin. The lack of reports with chondroitin alone seem to suggest that the interactions occurring in these reports may have been due to glucosamine. In two individual case reports, glucosamine/chondroitin combinations were associated with a significant increase in INR in patients previously stabilized on warfarin. Additionally, 20 voluntary case reports to the US Food & Drug Administration (FDA) have linked glucosamine plus chondroitin with increased INR, bruising, and bleeding in patients who were also taking warfarin. There have also been 20 additional case reports to the World Health Organization (WHO) that link glucosamine alone, without chondroitin, to increased INR in patients taking warfarin.

Likelihood Unlikely Evidence D

Monograph

Chondroitin Sulfate: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Chondroitin sulfate is a naturally occurring building block of cartilage that is widely taken, often with glucosamine, for osteoarthritis joint pain. The evidence is mixed—some people report modest relief while large studies show little or no benefit—but it appears generally well tolerated. Talk with your pharmacist or doctor before starting, especially if you have allergies or other health conditions.

Part used: Cartilage from animal sources (cattle, pig, shark, or fish)
Common forms: Capsules, tablets, powders (often combined with glucosamine)

People commonly use it for

Osteoarthritis joint pain
Joint stiffness
Cartilage support
Dry eye (eye drops)

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Generally well tolerated for short-term use, but quality varies and benefit is uncertain.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Chondroitin sulfate is a substance that occurs naturally in the cartilage of people and animals. Cartilage is the firm, cushioning tissue that protects the ends of your bones inside joints. Chondroitin is a type of molecule called a glycosaminoglycan, which helps cartilage hold water and stay flexible.

The chondroitin sold as a supplement is usually taken from animal cartilage, such as cattle, pig, shark, or fish. It is most often sold in capsules or tablets, and it is very commonly combined with glucosamine, another cartilage building block.

People mainly take chondroitin sulfate in hopes of easing the joint pain and stiffness of osteoarthritis, especially in the knees.

How it works

Chondroitin sulfate is a normal building block of cartilage. The main idea behind using it is that taking extra chondroitin may help the body maintain or rebuild cartilage and reduce the breakdown that happens in arthritis.

In laboratory and animal studies, chondroitin appears to help cartilage hold onto water, which keeps it springy, and it may slow the activity of enzymes that break cartilage down. It may also have mild anti-inflammatory effects.

It is important to know that much of this is based on lab and animal research. It is still not fully clear how much chondroitin is actually absorbed when you swallow it, or how much reaches your joints.

Effectiveness

Does Chondroitin Sulfate work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 20 uses evaluated

2 Possibly effective 18 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

Possibly Effective Cataracts