Glucosamine and chondroitin has 5 documented interactions in Magellan’s curated dataset, covering Anticoagulants (blood thinners), Diabetes medications, Acetaminophen (paracetamol). Each entry below gives the mechanism as the cited reference states it, the direction the risk runs, how serious that reference treats it, and what to actually do about it — which is, in every case, a conversation with the clinician or pharmacist who manages the prescription rather than a decision you make alone.
What it is. D-Glucosamine sulfate is a salt of glucosamine, an amino monosaccharide the body synthesizes from glucose and uses as a building block for the glycosaminoglycans and proteoglycans that make up joint cartilage. It is among the most widely sold dietary supplements worldwide and is marketed chiefly for osteoarthritis of the knee, where it is classified as a symptomatic slow-acting drug for osteoarthritis (SYSADOA).
Where it sits on the evidence. Magellan grades the supplement itself as Moderate evidence, with a typical studied dose of ~1,500 mg/day (sulfate). That grade is about whether it works, not about whether it is safe alongside your medication — the two questions are independent, and this page answers only the second.
Products this covers: D-Glucosamine Sulfate · Osteo Bi-Flex Triple Strength (Glucosamine Chondroitin + Joint Shield) · Glucosamine Chondroitin MSM (with OptiMSM).
How the risks cluster. The entries split across 2 different mechanisms — bleeding risk; opposing — and they are not managed the same way, so read each one rather than assuming a single rule covers all of them.
Safety and efficacy are separate questions, and this page only answers the first. For the second, the study Magellan’s coverage of Glucosamine and chondroitin rests on is:
“Regular glucosamine use was associated with significantly lower all-cause, cardiovascular, cancer, respiratory and digestive mortality (all-cause HR 0.73).”
A strong result does not make a supplement safe alongside your prescription, and a documented interaction does not mean the supplement does not work. Magellan grades those two things separately, and neither grade moves for a commission.
Magellan’s Medication Safety Check runs entirely on your device — type the medicines you take and it flags every documented interaction in this dataset. Nothing you type is sent anywhere.
Open the Medication Safety Check →Taking glucosamine alone or with chondroitin may increase the anticoagulant effect of warfarin, raising the risk of bleeding and elevated INR; this has been documented in case reports and reviewed in the pharmacotherapy literature.
Medicines in this group include: Warfarin (Coumadin, Jantoven), Apixaban (Eliquis), Rivaroxaban (Xarelto), Dabigatran (Pradaxa), Edoxaban (Savaysa), Heparin (Lovenox, Enoxaparin), Acenocoumarol (Sintrom).
Glucosamine, alone or combined with chondroitin, has documented case reports and pharmacologic data showing it can potentiate warfarin's effect and raise INR, increasing bleeding risk.
Medicines in this group include: Warfarin (Coumadin, Jantoven), Apixaban (Eliquis), Rivaroxaban (Xarelto), Dabigatran (Pradaxa), Edoxaban (Savaysa), Heparin (Lovenox, Enoxaparin), Acenocoumarol (Sintrom).
Glucosamine may worsen insulin resistance and reduce glucose tolerance, potentially interfering with blood sugar control in patients on diabetes medication.
Medicines in this group include: Metformin (Glucophage, Fortamet), Insulin (Humalog, Novolog), Glipizide (Glucotrol), Glyburide (Diabeta, Glynase), Glimepiride (Amaryl), Sitagliptin (Januvia), Empagliflozin (Jardiance), Dapagliflozin (Farxiga) and 5 more.
Taking glucosamine sulfate and acetaminophen together might reduce the effectiveness of both the supplement and the medication.
Medicines in this group include: Acetaminophen (Tylenol, Paracetamol).
Taking glucosamine sulfate together with acetaminophen may reduce the effectiveness of both the supplement and the medication.
Medicines in this group include: Acetaminophen (Tylenol, Paracetamol).
These are the warning signs that go with the medication classes on this page. They are general safety-netting, not a prediction that any supplement will cause them.
If something feels seriously wrong, do not wait for an appointment. Call 911 (US) or your local emergency number.
Severity describes the interaction as the cited reference frames it, not how a specific person will react. A “minor” entry in someone with kidney disease, on five other drugs, can matter more than a “major” one in someone on nothing else.
This is a curated set of interactions with citations — not an exhaustive pharmacology database. An interaction that is absent here has not been ruled out; it may simply not be documented in the references Magellan curates from. Supplements are also not batch-tested for identity or contamination the way prescription drugs are, so what is on the label is a claim rather than a guarantee. And most of these entries come from case reports and mechanistic work rather than randomized trials, which is exactly why the sensible response is a pharmacist review rather than either alarm or dismissal.
22 documented interactions across 17 supplements.
9 documented interactions across 9 supplements.
43 documented interactions across 24 supplements.
8 documented interactions · shares a drug class with Glucosamine and chondroitin.
4 documented interactions · shares a drug class with Glucosamine and chondroitin.
4 documented interactions · shares a drug class with Glucosamine and chondroitin.
7 documented interactions · shares a drug class with Glucosamine and chondroitin.
The mechanism and the research behind the compound itself.
A–Z of every supplement and drug class in this dataset, plus how to read an interaction.
What the research actually shows, graded independently of affiliate commissions.
Not without checking with the prescriber or pharmacist first. Magellan's dataset grades this as a major interaction: Taking glucosamine alone or with chondroitin may increase the anticoagulant effect of warfarin, raising the risk of bleeding and elevated INR; this has been documented in case reports and reviewed in the pharmacotherapy literature. (Source: Glucosamine.)
5 interactions are documented in Magellan's curated dataset: 2 major, 1 moderate, 2 minor. They cover Anticoagulants (blood thinners), Diabetes medications, Acetaminophen (paracetamol). Absence from this list is not proof of safety — it means no interaction is documented in the references we curate from.
Magellan lists the typical studied dose as: ~1,500 mg/day (sulfate). Dose matters for interactions — several of the entries on this page describe effects that only appear at supplemental rather than dietary intakes.