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Erdafitinib Side Effects

Medically reviewed by Last updated on Dec 10, 2022.

Applies to erdafitinib: oral tablet.

Serious side effects of Erdafitinib

Along with its needed effects, erdafitinib may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking erdafitinib:

More common

  • Bladder pain
  • bloody or cloudy urine
  • blurred vision
  • burning, dry, or itching eyes
  • chest tightness
  • confusion
  • difficult or labored breathing
  • difficult, burning, or painful urination
  • discharge
  • discoloration of the fingernails or toenails
  • excessive tearing
  • frequent urge to urinate
  • increased tearing
  • irregular heartbeat
  • loosening of the fingernails
  • lower back or side pain
  • mood or mental changes
  • muscle cramps in the hands, arms, feet, legs, or face
  • numbness and tingling around the mouth, fingertips, or feet
  • redness or soreness around the fingernails
  • redness, pain, or swelling of the eye, eyelid, or inner lining of the eyelid
  • redness, swelling, or pain of the skin
  • scaling of the skin on the hands and feet
  • seizures
  • stomach cramps
  • tremor
  • ulceration of the skin

Less common

  • Chest pain or discomfort
  • nausea
  • pain or discomfort in the arms, jaw, back, or neck
  • sweating
  • vomiting


  • Painful skin lesions

Other side effects of Erdafitinib

Some side effects of erdafitinib may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

For Healthcare Professionals

Applies to erdafitinib: oral tablet.


Very common (10% or more): Hemoglobin decreased (35%), platelets decreased (19%), leukocytes decreased (17%), neutrophils decreased (10%)[Ref]


Very common (10% or more): Musculoskeletal pain (e.g., back pain, musculoskeletal discomfort, musculoskeletal pain, musculoskeletal chest pain, neck pain, pain in extremity) (20%), arthralgia (11%)


Very common (10% or more): Dry eye (28%), central serous retinopathy/retinal pigment epithelial detachment (CSR/RPED) (25%), dry eye (e.g., dry eye, xerophthalmia, keratitis, foreign body sensation, corneal erosion) (28%), vision blurred (17%), conjunctivitis (11%), lacrimation increased (10%)

Common (1% to 10%): CSR/RPED involving central field of vision[Ref]


(76%), sodium decreased (40%), decreased appetite (38%), magnesium decreased (30%), phosphate decreased (24%), calcium increased (22%), potassium increased (16%), weight loss (e.g., weight loss, cachexia) (16%), fasting glucose increased (10%)[Ref]


Very common (10% or more): Urinary tract infection (17%), hematuria (11%)[Ref]


Very common (10% or more): Alanine aminotransferase increased (41%), alkaline phosphatase increased (41%), aspartate aminotransferase increased (30%)[Ref]


Very common (10% or more): Dyspnea (10%)[Ref]


Very common (10% or more): Fatigue (e.g., asthenia, fatigue, lethargy, malaise) (54%), pyrexia (14%)

Frequency not reported: Embryofetal toxicity[Ref]

Nervous system

Very common (10% or more): Dysgeusia (37%)[Ref]


Very common (10% or more): Creatinine increased (52%)[Ref]


Very common (10% or more): Onycholysis (e.g., onycholysis, onychoclasis, nail disorder, nail dystrophy, nail ridging) (41%), dry skin (e.g., dry skin, xerostomia) (34%), palmar-plantar erythrodysesthesia (26%), alopecia (26%), paronychia (17%), nail discoloration (11%)[Ref]


Very common (10% or more): Stomatitis (56%), diarrhea (47%), dry mouth (45%), constipation (28%), abdominal pain (e.g., abdominal pain, abdominal discomfort, abdominal pain upper, abdominal pain lower) (23%), nausea (21%), vomiting (13%), oropharyngeal pain (11%)[Ref]


1. Product Information. Balversa (erdafitinib). Janssen Products, LP. 2019.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.