Norfloxacin (Oral Route)

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Side Effects

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:

• Chest pain or discomfort
• Chills
• Diarrhea
• Discouragement
• Fast, irregular, pounding, or racing heartbeat or pulse
• Feeling sad or empty
• Fever
• Flushing or redness of the skin
• Hives or welts
• Increased sweating
• Irritability
• Irritation or soreness of the mouth
• Itching of the rectal area
• Itching skin
• Lack of appetite
• Loss of interest or pleasure
• Nausea
• Pain and inflammation at the joints
• Pain or discomfort in the arms, jaw, back, or neck
• Redness of the skin
• Shortness of breath
• Skin rash
• Sweating
• Swelling of the foot or hand
• Swelling of the stomach
• Tingling of the fingers
• Tiredness
• Trouble with concentrating
• Trouble with sleeping
• Unusually warm skin
• Vomiting

• Abdominal or stomach cramps
• Abdominal or stomach tenderness
• Anxiety
• Back, leg, or stomach pains
• Black, tarry stools
• Bleeding gums
• Blistering, peeling, or loosening of the skin
• Bloating
• Blood in the urine or stools
• Blurred vision
• Bone pain
• Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
• Clay-colored stools
• Cold sweats
• Constipation
• Cool, pale skin
• Cough or hoarseness
• Cracks in the skin
• Dark-colored urine
• Decreased frequency or amount of urine
• Diarrhea, watery and severe, which may also be bloody
• Difficulty with breathing, chewing, swallowing, or talking
• Difficulty with moving
• Dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
• Double vision
• Drooping eyelids
• Dry mouth
• Dry skin
• False sense of well-being
• Fever with or without chills
• Fruit-like breath odor
• General body swelling
• General feeling of tiredness or weakness
• Greatly decreased frequency of urination or amount of urine
• Headache
• Inability to move the arms and legs
• Increased blood pressure
• Increased hunger
• Increased sensitivity of the skin to sunlight
• Increased thirst
• Increased urination
• Indigestion
• Irregular or slow heart rate
• Large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
• Light-colored stools
• Loss of heat from the body
• Lower back or side pain
• Mood or mental changes
• Mood swings
• Muscle aching or cramping
• Muscle pain or stiffness
• Muscle weakness
• Nervousness
• Nightmares
• Nosebleeds
• Numbness or tingling in the hands, feet, or lips
• Pain or burning while urinating
• Pain, inflammation, or swelling in the calves, shoulders, or hands
• Pain, swelling, or redness in the joints
• Painful or difficult urination
• Pains in the stomach, side, or abdomen, possibly radiating to the back
• Personality changes
• Pinpoint red spots on the skin
• Puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
• Red skin lesions, often with a purple center
• Red, irritated eyes
• Red, swollen skin
• Scaly skin
• Seizures
• Severe sunburn
• Severe tiredness
• Shakiness and unsteady walk
• Skin rash
• Slurred speech
• Sore throat
• Sores, ulcers, or white spots on the lips or in the mouth
• Sores, welting, or blisters
• Stomach pain, continuing
• Sudden decrease in the amount of urine
• Sudden numbness and weakness in the arms and legs
• Swelling of the face, fingers, or lower legs
• Swelling or inflammation of the mouth
• Swollen glands
• Tightness in the chest
• Unexplained weight loss
• Unpleasant breath odor
• Unsteadiness, awkwardness, trembling, or other problems with muscle control or coordination
• Unusual behavior, such as disorientation to time or place, failure to recognize people, hyperactivity, or restlessness
• Unusual bleeding or bruising
• Unusual tiredness or weakness
• Unusual weight loss
• Vomiting of blood
• Weakness in the arms, hands, legs, or feet
• Weight gain
• Wheezing
• Yellowing of the eyes or skin

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:

• Lack or loss of strength

• Acid or sour stomach
• Belching
• Bitter taste
• Cramps
• Excess air or gas in the stomach or intestines
• Full feeling
• Heartburn
• Heavy bleeding
• Pain
• Passing gas
• Sleepiness or unusual drowsiness
• Sleeplessness
• Stomach discomfort, upset, or pain
• Unable to sleep
• Weight loss

• Change in taste
• Continuing ringing or buzzing or other unexplained noise in the ears
• Hearing loss
• Itching of the vagina or outside genitals
• Loss of taste
• Pain during sexual intercourse
• Seeing double
• Thick, white curd-like vaginal discharge without odor or with mild odor
• Uncontrolled eye movements

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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