Drug Interaction Report

Garlic and Enoxaparin Injection: Interaction Details

A pharmacist-reviewed analysis of the Garlic and Enoxaparin Injection interaction: the documented clinical effects, severity rating, onset, mechanism, and management considerations, with cited references throughout.

AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature

Enoxaparin Injection

Lovenox Lovenox®
+

Garlic

No brand names on record
Dr. Brian Staiger, PharmD, BCPS
Medically reviewed by
Dr. Brian Staiger, PharmD, BCPS
Updated Aug 8, 2026
Editorial policy · Data sources
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Interaction severity
Moderate
Can be significant — usually manageable with monitoring.
How we grade severity & evidence

Severity levels

  • Contraindicated: These should generally not be used together.
  • Major: Potentially serious — often needs a change or close monitoring.
  • Moderate: Can be significant — usually manageable with monitoring.
  • Minor: Usually limited clinical impact.

Evidence grades

  • Established: Well documented — supported by controlled studies or strong clinical data.
  • Probable: Good supporting evidence, though not definitively proven.
  • Suspected: Some evidence suggests this interaction, but it is not well established.
  • Possible: Limited or conflicting evidence; the interaction may occur.
  • Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.

Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.

Of 26 documented Garlic interactions, 16 are rated moderate — including this one.
Onset
delayed
Evidence
theoretical
Severity
Moderate

What happens

Increased risk of bleeding

Interaction Deep Dive

Theoretically, the antiplatelet effect of garlic may add to the effect of low molecular weight heparins, increasing the risk for bleeding complications. Elevated international normalized ratio (INR) has been reported in patients initiating garlic who had previously been stabilized on warfarin1. Garlic has been shown to inhibit platelet aggregation when taken orally 2345. Subdural hematoma and other bleeding consequences have been described in case reports when patients consumed garlic without concomitant medications known to affect blood coagulation 678. Given orally to humans, garlic increased fibrinolytic activity possibly through activated plasminogen 5. The ability of garlic to affect platelet aggregation depends on the product preparation, with different products containing different active constituents 9.

Why it happens (mechanism)

Additive antiplatelet effects; garlic may inhibit platelet aggregation through reduced thromboxane B2, increased fibrinolytic activity

Common questions

Can I take Garlic and Enoxaparin Injection together?

Increased risk of bleeding Always confirm with your pharmacist or prescriber before making any change.

How serious is the Garlic and Enoxaparin Injection interaction?

It is rated moderate. Can be significant — usually manageable with monitoring.

How quickly could this interaction happen?

The documented onset is "delayed". Effects tend to build up gradually over days to weeks.

How strong is the evidence for this interaction?

The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.

From our Q&A

Real reader questions about these medications, each personally answered by our pharmacist:

Questions for your pharmacist

  • Does my dose of Garlic or Enoxaparin Injection need adjusting while I take them together?
  • What symptoms should prompt me to call you or my prescriber right away?
  • Does the timing of my doses matter for this combination?
  • Is there anything you'd monitor while I'm on both?

References (9)

  1. Sunter W: Warfarin and garlic. Pharm J 1991; 246:722.
  2. Kiesewetter H, Jung F, Jung EM, et al: Effects of garlic coated tablets in peripheral arterial occlusive disease. Clin Invest 1993; 71:383-386. PubMed
  3. Kiesewetter H, Jung F, Jung EM, et al: Effect of garlic on platelet aggregation in patients with increased risk of juvenile ischemia attack. Eur J Clin Pharmacol 1993a; 45:333-336.
  4. Legnani C, Frascaro M, Gauzzaloca G, et al: Effects of a dried garlic preparation on fibrinolysis and platelet aggregation in healthy subjects. Arzneimittelforschung 1993; 43(2):119-122.
  5. Harenberg J, Giese C, & Zimmermann R: Effect of dried garlic on blood coagulation, fibrinolysis, platelet aggregation and serum cholesterol levels in patients with hyperlipoproteinemia. Atheroscler 1988; 74(3):247-249. PubMed
  6. Burnham BE: Garlic as a possible risk for postoperative bleeding. Plast Reconst Surg 1995; 95:213. DOI
  7. German K, Kumar U, & Blackford HN: Garlic and the risk of TURP bleeding. Br J Urol 1995; 76:518. PubMed
  8. Rose KD, Croissant PD, Parliament CF, et al: Spontaneous spinal epidural hematoma with associated platelet dysfunction from excessive garlic ingestion: a case report. Neurosurg 1990; 26:880-882. DOI
  9. Lawson LD, Ransom DK, Hughes BG, et al: Inhibition of whole blood platelet-aggregation by compounds in garlic clove extracts and commercial garlic products. Thromb Res 1992; 65:141-156. PubMed
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Enoxaparin Injection

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