Fluxid Side Effects
Generic name: famotidine
Medically reviewed by Drugs.com. Last updated on Jul 24, 2023.
Note: This document contains side effect information about famotidine. Some dosage forms listed on this page may not apply to the brand name Fluxid.
Applies to famotidine: oral powder for suspension, oral tablet.
Serious side effects of Fluxid
Along with its needed effects, famotidine (the active ingredient contained in Fluxid) 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 famotidine:
- bleeding gums
- blistering, peeling, or loosening of the skin
- blood in the urine or stools
- bloody, black, or tarry stools
- difficulty breathing
- fast, irregular, pounding, or racing heartbeat or pulse
- feeling sad or empty
- lack of appetite
- loss of interest or pleasure
- noisy breathing
- pinpoint red spots on the skin
- seeing, hearing, or feeling things that are not there
- swelling around the eyes
- tightness in the chest
- trouble concentrating
- trouble sleeping
- unusual bleeding or bruising
Incidence not known
- blistering, peeling, or loosening of the skin
- burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
- chest pain
- clay-colored stools
- dark urine
- difficulty swallowing
- dizziness or fainting
- general feeling of tiredness or weakness
- high fever
- hives, itching, skin rash
- joint or muscle pain
- large, hive-like swelling on face, eyelids, lips, tongue, throat, hands, legs, feet, or genitals
- light-colored stools
- lower back or side pain
- painful or difficult urination
- pale 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
- sore throat
- sores, ulcers, or white spots in the mouth or on the lips
- stomach pain
- swollen glands
- unpleasant breath odor
- unusual tiredness or weakness
- upper right abdominal pain
- vomiting of blood
- yellow eyes or skin
Other side effects of Fluxid
Some side effects of famotidine 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:
- Difficulty having a bowel movement
- Bad, unusual, or unpleasant (after) taste
- bone or muscle pain
- change in taste
- continuing ringing or buzzing or other unexplained noise in the ears
- decreased interest in sexual intercourse
- difficulty in moving
- dry mouth
- dry skin
- feeling of warmth
- hearing loss
- inability to have or keep an erection
- lack or loss of strength
- loss in sexual ability, desire, drive, or performance
- muscle pain or stiffness
- redness of the face, neck, arms and occasionally, upper chest
- redness of the white part of the eyes
- stomach discomfort
- unusual drowsiness
For Healthcare Professionals
Applies to famotidine: compounding powder, intravenous solution, oral powder for reconstitution, oral tablet, oral tablet chewable, oral tablet disintegrating.
Common (1% to 10%): Constipation, diarrhea
Uncommon (0.1% to 1%): Nausea, vomiting, flatulence, dry mouth, abdominal discomfort or distension[Ref]
Convulsions occurred in patients with renal dysfunction.[Ref]
Common (1% to 10%): Headache, dizziness
Very rare (less than 0.01%): Paresthesia, somnolence, epileptic seizures, convulsion
Frequency not reported: Grand mal seizure, taste disorder[Ref]
Uncommon (0.1% to 1%): Rash, pruritus
Frequency not reported: Acne, dry skin, flushing[Ref]
Uncommon (0.1% to 1%): Fatigue
Frequency not reported: Asthenia, fatigue, facial/orbital edema, tinnitus[Ref]
Uncommon (0.1% to 1%): Loss of appetite
Frequency not reported: Anorexia[Ref]
Rare (0.01% to 0.1%): Intrahepatic cholestasis, jaundice, increased liver enzyme abnormalities (transaminases, gamma GT, alkaline phosphatase, bilirubin)
Frequency not reported: Cholestatic jaundice, hepatitis[Ref]
Rare (0.01% to 0.1%): Bronchospasm
Rare (0.01% to 0.1%): Arthralgia
Very rare (less than 0.01%): Muscle cramps
Frequency not reported: Rhabdomyolysis, musculoskeletal pain[Ref]
When patients obtained follow-up, psychic disturbances were found to be reversible.[Ref]
Very rare (less than 0.01%): Hallucinations, disorientation, confusion, anxiety, agitation, depression, reduced libido, insomnia
Frequency not reported: Psychic disturbances[Ref]
QT interval prolongation occurred in patients with renal dysfunction.[Ref]
Very rare (less than 0.01%): Chest tightness, prolonged QT interval
Frequency not reported: Conjunctival injection[Ref]
Frequency not reported: Gynecomastia[Ref]
Frequently asked questions
- Is famotidine safer than omeprazole for heartburn?
- Can you take famotidine long term?
- Can I take omeprazole in the morning and famotidine at night?
More about Fluxid (famotidine)
- Check interactions
- Compare alternatives
- Dosage information
- During pregnancy
- FDA approval history
- Drug class: H2 antagonists
Related treatment guides
1. Product Information. Pepcid (famotidine). Merck & Co., Inc. 2002.
2. Product Information. Pepcid AC (famotidine). Johnson and Johnson/Merck. 2001.
3. Cerner Multum, Inc. UK Summary of Product Characteristics.
4. Cerner Multum, Inc. Australian Product 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.