Nalfon Side Effects
Generic Name: fenoprofen
Note: This page contains side effects data for the generic drug fenoprofen. It is possible that some of the dosage forms included below may not apply to the brand name Nalfon.
It is possible that some side effects of Nalfon 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 fenoprofen: oral capsule, oral tablet
As well as its needed effects, fenoprofen (the active ingredient contained in Nalfon) may cause unwanted side effects that require medical attention.
If any of the following side effects occur while taking fenoprofen, check with your doctor immediately:More common
- Abdominal pain
- bloating or swelling of face, arms, hands, lower legs, or feet
- blurred vision
- continuing ringing or buzzing or other unexplained noise in ears
- decreased hearing
- difficult or labored breathing
- fast, irregular, pounding, or racing heartbeat or pulse
- hearing loss
- itching skin
- rapid weight gain
- shortness of breath
- tightness in chest
- tingling of hands or feet
- unusual weight gain or loss
- Back, leg, or stomach pains
- black or red, tarry stools
- bleeding gums
- blood in vomit
- bloody or cloudy urine
- bloody stools
- burning feeling in chest or stomach
- clay-colored stools
- coughing up blood
- dark urine
- difficult, burning, or painful urination
- difficulty in swallowing
- dry mouth
- fever with or without chills
- frequent urge to urinate
- general body swelling
- greatly decreased frequency or amount of urine
- increased blood pressure
- increased menstrual flow or vaginal bleeding
- increased thirst
- large, hive-like swelling on face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
- loss of appetite
- lower back or side pain
- not able to pass urine
- pale skin
- pinpoint red or purple spots on skin
- prolonged bleeding from cuts
- puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
- red or dark brown urine
- redness of skin
- severe or continuing stomach pain
- sore throat
- sores, ulcers, or white spots on lips or in mouth
- stomach upset
- swelling of face, fingers, or lower legs
- swelling of hands, legs, and feet
- swollen or painful glands
- tenderness in stomach area
- troubled breathing
- unpleasant breath odor
- unusual bleeding or bruising
- unusual tiredness or weakness
- vomiting of blood or material that looks like coffee grounds
- yellow eyes or skin
- Dizziness, faintness, or lightheadedness when getting up from a lying or sitting position suddenly
- irregular, fast or slow, or shallow breathing
- pale or blue lips, fingernails, or skin
- rapid, deep breathing
- shakiness and unsteady walk
- stomach cramps
- unsteadiness, trembling, or other problems with muscle control or coordination
Some fenoprofen 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
- Acid or sour stomach
- lack or loss of strength
- sleepiness or unusual drowsiness
- stomach discomfort
- Body aches or pain
- ear congestion
- increased sweating
- loss of voice
- mood or mental changes
- muscle aches
- nasal congestion
- stuffy or runny nose
- General feeling of discomfort or illness
- trouble sleeping
- unable to sleep
For Healthcare Professionals
Applies to fenoprofen: compounding powder, oral capsule, oral tablet
Patients with a history of serious gastrointestinal events or alcohol abuse are at increased risk for severe gastrointestinal side effects. Fenoprofen (the active ingredient contained in Nalfon) should be used with caution in these patients.
Gastrointestinal side effects have been reported frequently. These have included dyspepsia (up to 10%), nausea, vomiting, abdominal pain, and constipation. More serious gastrointestinal side effects include peptic ulcer with or without perforation, gastrointestinal hemorrhage, and pancreatitis.
Hepatic side effects have included elevations in liver function tests, which may occur in up to 15% of patients. In addition, jaundice and cholestatic hepatitis have been reported.
Elevations in liver function tests to three times normal values occur in less than 1% of patients.
Cautious use of fenoprofen with frequent monitoring of the liver function tests is recommended in patients with liver disease,
Renal side effects have included increased serum creatinine and blood urea nitrogen, oliguria, hematuria, cystitis, interstitial nephritis, nephrotic syndrome, and renal papillary necrosis.
Idiosyncratic nephropathy is seen more frequently with fenoprofen than with other nonsteroidal anti-inflammatory agents, and may occur days to months after initiation of therapy.
Fenoprofen may impair the ability of the kidney to cope with low renal blood flow states due to inhibition of prostaglandin-dependent afferent arteriolar vasodilation. Renal function may be further compromised in patients with heart failure, hypovolemia, cirrhosis, nephrotic syndrome, or hypoalbuminemia. Additional risk factors for nonsteroidal anti-inflammatory drug-induced renal insufficiency are advanced age and concomitant use of diuretics.
A case-control study suggested that patients who consumed 5000 or more pills containing NSAIDs during their lifetime may be at increased risk for end-stage renal disease.
Patients with reduced renal function may be at increased risk for renal side effects.
Hypersensitivity side effects have been reported rarely. These have included eosinophilia. rash, angioedema, bronchospasm, and anaphylaxis. Fenoprofen-associated nephritis may be due to a hypersensitivity. In addition, rare cases of pulmonary hypersensitivity and severe dermatologic reactions have been reported.
Hematological side effects have included platelet dysfunction, thrombocytopenia, agranulocytosis, pure red cell aplasia, hemolytic anemia, and aplastic anemia.
Nervous system side effects have been rare. These have included dizziness, headache, nervousness, asthenia, and fatigue.
Dermatologic side effects have included increased sweating, pruritus, and rash. In addition, rare cases of exfoliative dermatitis, Stevens-Johnson syndrome, and toxic epidermal necrolysis have been reported.
Lab values which may be altered by fenoprofen (the active ingredient contained in Nalfon) include elevated free and total triiodothyronine (T3) due to interference with the T3 assay.
Nonsteroidal anti-inflammatory drugs (NSAIDs) may elevate blood pressure and antagonize the blood-pressure lowering effect of antihypertensive mediations in patients already being treated with antihypertensive drugs.
Cardiovascular side effects have included edema and palpitations. In addition, blood pressure may be elevated by fenoprofen, which may have clinical relevance in patients with comorbid illnesses.
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