Xiaflex Side Effects

Generic Name: collagenase clostridium histolyticum

Note: This page contains side effects data for the generic drug collagenase clostridium histolyticum. It is possible that some of the dosage forms included below may not apply to the brand name Xiaflex.

It is possible that some side effects of Xiaflex may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.

For the Consumer

Applies to collagenase clostridium histolyticum: injection powder for solution

As well as its needed effects, collagenase clostridium histolyticum (the active ingredient contained in Xiaflex) may cause unwanted side effects that require medical attention.

If any of the following side effects occur while taking collagenase clostridium histolyticum, check with your doctor or nurse immediately:

More common—Dupuytren's contracture
  • Bruising or bleeding at the injection site
  • swelling of the hands
  • tearing of the skin
More common—Peyronie's disease
  • Itching, pain, redness, swelling, or bruise of the penis
  • popping sound or sensation in an erect penis
Less common—Peyronie's disease
  • Decreased interest in sexual intercourse
  • inability to have or keep an erection
  • loss in sexual ability, desire, drive, or performance
  • painful sexual intercourse
Incidence not known—Dupuytren's contracture
  • Bone pain
  • lower back or side pain
  • painful, swollen joints

Some collagenase clostridium histolyticum side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them:

More common—Dupuytren's contracture
  • Blistering, burning, coldness, discoloration of the skin, feeling of pressure, hives, infection, inflammation, lumps, numbness, rash, scarring, stinging, tingling, or ulceration at the injection site
  • bruise
  • flushing, redness of the skin or unusually warm skin at the injection site
  • itching, pain, swelling, or tenderness at the injection site
  • swollen, painful, or tender lymph glands in the neck or armpit

For Healthcare Professionals

Applies to collagenase clostridium histolyticum: injectable powder for injection


Musculospiral side effects have included tendon ruptures and other serious injury to the injected extremity,[Ref]


Local side effects have included swelling of the injected hand, contusion, injection site reaction and bleeding, and pain in the treated extremity.[Ref]


Cardiovascular side effects have included vasovagal syncope after finger extension procedures.[Ref]


Other side effects have included lymphadenopathy, lymph node pain, and axillary pain.[Ref]


1. "Product Information. Xiaflex (collagenase clostridium histolyticum)." Auxilium Pharmaceuticals Inc, Norristown, PA.

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