Medically reviewed by Dr. Rao Khurram Ayoub, RPh, PhD (Pharmaceutics)
Updated on
Medications That Increase Risk of Tendon Rupture
Medications that increase risk of tendon rupture + warning symptoms
Not all tendon ruptures are from sport. Some drugs weaken collagen, block tendon repair, or increase inflammation – and risk stays high for weeks after you stop. Highest risk: fluoroquinolones + corticosteroids together, age >60, transplant, kidney disease.
Medically reviewed by Dr. Rao Khurram Ayoub • Last reviewed Nov 2026 • For education only, not medical advice
1. The 4 Proven Classes – Ranked by Risk
A study by Knobloch, 2016 stated that four main drug classes have been reported to be associated with deteriorated tendon properties: corticosteroids, quinolone antibiotics, aromatase inhibitors, and statins.
| Rank | Drug Class / Examples | Risk & Tendon | Onset / Duration |
|---|---|---|---|
| HIGHEST | Fluoroquinolones Ciprofloxacin, Levofloxacin, Moxifloxacin | Achilles most common, also rotator cuff, quadriceps, biceps. 【FDA】 Boxed Warning. | Hours to 2 weeks, risk persists 60 days after stopping |
| 2 | Corticosteroids Prednisone, Methylprednisolone, Dexamethasone – oral, IV, local injection | Weakens collagen, inhibits repair. Local injection directly into tendon = highest rupture risk. | Weeks–months, worse with long-term use |
| 3 | Aromatase Inhibitors Anastrozole, Letrozole, Exemestane | Tenosynovitis hands/wrists, Achilles / shoulder tendinopathy, rare rupture. | 2 weeks – 19 months |
| 4 | Statins Atorvastatin, Rosuvastatin, Simvastatin | Weakest evidence. Achilles, quadriceps, distal biceps tendinopathy. | Months, often with exercise / FQ use |
2. Fluoroquinolones – How Much Risk?
A study by Alves et al., 2019 stated that fluoroquinolone use was associated with increased risk of tendon injury, with Achilles tendinitis OR 3.95 and Achilles tendon rupture OR 2.52 in a systematic review and meta-analysis.
A study by Morales et al., 2019 stated that current fluoroquinolone exposure was associated with increased risk of any tendon rupture (aIRR 1.61) and Achilles tendon rupture (aIRR 3.14) that persisted for 60 days, and risk was greatest when co-prescribed with oral corticosteroids (aIRR 19.36 for Achilles rupture).
Achilles tendon: Normal → Tendonitis → Tears → Rupture
Mechanism: FQs increase matrix metalloproteinases (MMPs), degrade collagen, cause tenocyte death, and reduce tendon blood flow.
What to do: Stop FQ at first tendon pain, rest, do NOT stretch / run through pain, ice, see doctor within 24h. Do not take NSAID to mask pain and keep playing.
3. Other Drugs With Weaker / Emerging Evidence
| Drug | Evidence | Note |
|---|---|---|
| Anabolic Steroids Testosterone, Nandrolone | Case series, bodybuilders | Muscle grows faster than tendon can adapt → biceps / pectoral rupture |
| Isotretinoin | Case reports | Linked to tendinopathy in Bolon 2017 review – less consistent |
| Protease Inhibitors (HIV) | Case reports | Mainly indinavir – linked less consistently |
| Collagenase / Local Steroid Injection | Case reports | Injection into / around tendon directly weakens it – avoid intratendinous injection |
A study by Bolon, 2017 stated that toxic tendinopathy is a rare but reproducible complication with aromatase inhibitors, fluoroquinolones, long-term glucocorticoids, and statins, and has been linked less consistently to anabolic steroids, antiretrovirals, metalloproteinase inhibitors, and isotretinoin.
4. Who Is At Highest Risk?
- Age >60 – tendon collagen already weaker
- FQ + Steroid together – 19x risk (see above)
- Kidney / Heart / Lung Transplant 【FDA】 Boxed Warning group
- Chronic kidney disease, diabetes, gout, rheumatoid arthritis
- Recent intense exercise / new sport – tendon overloaded while drug-weakened
- Previous tendinopathy / rupture
Drug-induced tendon ruptures: Risks + Prevention
5. Red Flags – Stop Drug & Seek Urgent Care
- Sudden pop / snap in Achilles, shoulder, quadriceps + pain + cannot walk / lift
- Tendon pain + swelling + warmth within days of starting FQ / steroid
- Heel / Achilles pain that gets worse with walking, not better with rest
- Visible gap / bruising over tendon
FAQs
How long after stopping fluoroquinolones is tendon rupture risk high?
Risk is highest in first 2 weeks, but Morales et al., 2019 showed risk persisted for 60 days after exposure. FDA warns risk can occur months after stopping. Avoid intense jumping / sprinting for at least 2 months.
Can statins alone cause tendon rupture?
Evidence is weak. Statins alone were not associated with increased tendon rupture in the Morales 2019 nested case-control study. Risk rises if combined with FQ, steroids, or heavy exercise.
Should I stop my statin / steroid if my tendon hurts?
No – do not stop prescribed steroids, transplant drugs, or cancer drugs on your own. Stop the FQ (if you are on one) and call your prescriber same day. For statins, discuss – benefit usually outweighs tendon risk.
What is the safest antibiotic if I have tendon risk?
Ask your doctor for a non-FQ alternative (e.g., amoxicillin, doxycycline, nitrofurantoin depending on infection). FDA says avoid FQs for uncomplicated UTI, sinusitis, and bronchitis when other options exist.
References
- Alves et al., 2019 – Alves, C., Mendes, D. and Marques, F.B. (2019) Fluoroquinolones and the risk of tendon injury: a systematic review and meta-analysis. European Journal of Clinical Pharmacology, 75(10), pp.1431–1443.
- Bolon, 2017 – Bolon, B. (2017) Mini-review: Toxic tendinopathy. Toxicologic Pathology, 45(7), pp.834–837.
- FDA, 2016 – U.S. Food and Drug Administration (2016) Ciprofloxacin – FDA Label: Boxed Warning – Tendinitis and Tendon Rupture. Available at: https://www.accessdata.fda.gov/drugsatfda_docs/label/2016/019537s086lbl.pdf (Accessed: 10 November 2026).
- Knobloch, 2016 – Knobloch, K. (2016) Drug-induced tendon disorders. Advances in Experimental Medicine and Biology, 920, pp.229–238.
- Morales et al., 2019 – Morales, D.R., Slattery, J., Pacurariu, A., Pinheiro, L., McGettigan, P. and Kurz, X. (2019) Relative and absolute risk of tendon rupture with fluoroquinolone and concomitant fluoroquinolone / corticosteroid therapy: population-based nested case–control study. Clinical Drug Investigation, 39(2), pp.205–213.
Medically reviewed by Dr. Rao Khurram Ayoub. Last reviewed Nov 2026.