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Avelox

Avelox Side Effects

Kristianne Hannemann, PharmDCydnee Ng, PharmD
Reviewed by Kristianne Hannemann, PharmD, Cydnee Ng, PharmD
Last reviewed on September 18, 2026

The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.

Common Side Effects

  • Nausea (7%)
  • Diarrhea (6%)
  • Headache (4%)
  • Dizziness (3%)

Less Common Side Effects

  • Vomiting
  • Constipation
  • Belly pain
  • Indigestion
  • Trouble sleeping
  • Fever
  • Low potassium

Avelox serious side effects

Contact your healthcare provider immediately if you experience any of the following.

  • Tendon problems: tendon pain, swelling, or tearing, especially around the Achilles tendon
  • Nerve damage: pain, burning, tingling, numbness, weakness
  • Seizures
  • Changes in thoughts, mood, or behavior: confusion, hallucinations, anxiety, depression, suicidal thoughts
  • Bulge or tear in the aorta: sudden and severe chest, back, or stomach pain, shortness of breath
  • Abnormal heart rhythm: pounding or irregular heartbeat, severe dizziness, fainting
  • Infectious diarrhea (C. difficile-related diarrhea): severe or watery diarrhea, foul-smelling diarrhea, frequent bowel movements, stomach cramps, nausea, fever
  • Kidney problems: urinating less often than usual, swelling, unexplained weight gain
  • Liver problems: swelling of your stomach, yellow skin or eyes, dark urine
  • Serious allergic reaction or skin reaction: hives, rash, blisters, skin reddening, swelling of the lips or tongue, trouble breathing
When do Avelox possible side effects begin and end?
Time passed since treatment started:
H
D
W
M
Nausea
Diarrhea
Risk of tendon problems
Risk of nerve problems
Seek immediate medical care if you experience this side effect.
If a line continues to the right, you'll likely keep experiencing this side effect once it starts.

Source: DailyMed

The following Avelox side effects have also been reported

Along with its needed effects, a medicine 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:

Incidence not known

Fainting or loss of consciousness

fast or irregular breathing

itching or skin rash

swelling of the eyes or eyelids

tightness in the chest

trouble with breathing

Some side effects 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

Burning, dry, or itching eyes

change in vision

decreased vision

dry eye

excessive tearing

eye discharge

itching of the eye

pain in the eye

red, sore eyes

tearing

Less common

Body aches or pain

congestion

cough or hoarseness

decreased hearing

dryness or soreness of the throat

fever or chills

general body discomfort

lower back or side pain

painful or difficult urination

rubbing or pulling of the ears (in children)

runny nose

sore throat

tender, swollen glands in the neck

trouble with swallowing

voice changes

vomiting and diarrhea (in infants)

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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