Fusidic Acid – Uses, Dosage, Side Effects, Interactions

Last updated: February 7, 2026Reviewed date: February 7, 2026Reading time: 9 min read
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Fusidic Acid is a bacteriostatic antibiotic derived from the fungus Fusarium coccineum and used as a topical medication to treat skin infections. Fusidic acid acts as a bacterial protein synthesis inhibitor by preventing the turnover of elongation factor G (EF-G) from the ribosome. Fusidic acid...

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Article Summary

Fusidic Acid is a bacteriostatic antibiotic derived from the fungus Fusarium coccineum and used as a topical medication to treat skin infections. Fusidic acid acts as a bacterial protein synthesis inhibitor by preventing the turnover of elongation factor G (EF-G) from the ribosome. Fusidic acid is effective primarily on gram-positive bacteria. Fusidic acid is a steroid antibiotic that is isolated from the fermentation broth of...

Key Takeaways

  • This article explains Mechanism of Action of Fusidic Acid in simple medical language.
  • This article explains Indications of Fusidic Acid in simple medical language.
  • This article explains Contraindications of Fusidic Acid in simple medical language.
  • This article explains Dosage Fusidic Acid in simple medical language.
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Definition

Fusidic Acid is a bacteriostatic bacterial infections. সহজ বাংলা: ব্যাকটেরিয়ার সংক্রমণের ওষুধ।" data-rx-term="antibiotic" data-rx-definition="An antibiotic is a medicine used to treat bacterial infections. সহজ বাংলা: ব্যাকটেরিয়ার সংক্রমণের ওষুধ।">antibiotic derived from the fungus Fusarium coccineum and used as a topical medication to treat skin infections. Fusidic acid acts as a bacterial protein synthesis inhibitor by preventing the turnover of elongation factor G (EF-G) from the ribosome. Fusidic acid is effective primarily on gram-positive bacteria.

Fusidic acid is a steroid bacterial infections. সহজ বাংলা: ব্যাকটেরিয়ার সংক্রমণের ওষুধ।" data-rx-term="antibiotic" data-rx-definition="An antibiotic is a medicine used to treat bacterial infections. সহজ বাংলা: ব্যাকটেরিয়ার সংক্রমণের ওষুধ।">antibiotic that is isolated from the fermentation broth of Fusidium coccineum. It has a role as a protein synthesis inhibitor, (pantothenate kinase) inhibitor, and an Escherichia coli metabolite. It is a 3alpha-hydroxysteroid, an 11alpha-hydroxysteroid, a sterol ester, a steroid acid, an alpha,beta-unsaturated monocarboxylic acid and a steroid antibiotic. It is the conjugate acid of a fusidate. It derives from a hydride of a 5alpha-cholestane.

Fusidic Acid is only found in individuals that have used or taken this drug. It is an bacterial infections. সহজ বাংলা: ব্যাকটেরিয়ার সংক্রমণের ওষুধ।" data-rx-term="antibiotic" data-rx-definition="An antibiotic is a medicine used to treat bacterial infections. সহজ বাংলা: ব্যাকটেরিয়ার সংক্রমণের ওষুধ।">antibiotic isolated from the fermentation broth of Fusidium coccineum. It acts by inhibiting translocation during protein synthesis. Fusidic acid works by interfering with bacterial protein synthesis, specifically by preventing the translocation of the elongation factor G (EF-G) from the ribosome. It also can inhibit chloramphenicol acetyltransferase enzymes.

Fusidate Sodium is a sodium salt form of fusidic acid, a bacteriostatic bacterial infections. সহজ বাংলা: ব্যাকটেরিয়ার সংক্রমণের ওষুধ।" data-rx-term="antibiotic" data-rx-definition="An antibiotic is a medicine used to treat bacterial infections. সহজ বাংলা: ব্যাকটেরিয়ার সংক্রমণের ওষুধ।">antibiotic derived from the fungus Fusarium coccineum and used as a topical medication to treat skin infections.

Synonyms

  • ácido fusídico
  • Fucidate
  • Fucidin acid
  • Fusidate
  • Fusidic acid
  • Fusidine
  • Rapamycin

Mechanism of Action of Fusidic Acid

Fusidic acid works by interfering with bacterial protein synthesis, specifically by preventing the translocation of the elongation factor G (EF-G) from the ribosome. It also can inhibit chloramphenicol acetyltransferase enzymes.

Fusidic Acid is only found in individuals that have used or taken this drug. It is an bacterial infections. সহজ বাংলা: ব্যাকটেরিয়ার সংক্রমণের ওষুধ।" data-rx-term="antibiotic" data-rx-definition="An antibiotic is a medicine used to treat bacterial infections. সহজ বাংলা: ব্যাকটেরিয়ার সংক্রমণের ওষুধ।">antibiotic isolated from the fermentation broth of Fusidium coccineum. (From Merck Index, 11th ed) It acts by inhibiting translocation during protein synthesis. Fusidic acid works by interfering with bacterial protein synthesis, specifically by preventing the translocation of the elongation factor G (EF-G) from the ribosome. It also can inhibit chloramphenicol acetyltransferase enzymes.

Compounds that inhibit the synthesis of proteins. They are usually ANTI-BACTERIAL AGENTS or toxins. Mechanism of the action of inhibition includes the interruption of peptide-chain elongation, blocking the A site of ribosomes, the misreading of the genetic code or the prevention of the attachment of oligosaccharide side chains to glycoproteins.

Indications of Fusidic Acid

For the treatment of bacterial infections.

  • Conjunctivitis, Bacterial
  • Mild Atopic dermatitis
  • Mild Dermatitis caused by Staphylococcus aureus
  • Moderate Atopic dermatitis
  • Moderate Dermatitis caused by Staphylococcus aureus
  • Fusidic acid is active in vitro against Staphylococcus aureus, most coagulase-positive staphylococci, Beta-hemolytic streptococci, Corynebacterium species, and most clostridium species. Fusidic acid has no known useful activity against enterococci or most Gram-negative bacteria. Fusidic acid is active in vitro and clinically against Mycobacterium leprae but has only marginal activity against Mycobacterium tuberculosis.
  • Topical fusidic acid is occasionally used as a treatment for acne vulgaris. As a treatment for acne, fusidic acid is often partially effective at improving acne symptoms. However, research studies have indicated that fusidic acid is not as highly active against Cutibacterium acnes as many other antibiotics that are commonly used as acne treatments. Fusidic acid is also found in several additional topical skin and eye preparations.
  • Fusidic acid is being tested for indications beyond skin infections. There is evidence from compassionate use cases that fusidic acid may be effective in the treatment of patients with prosthetic joint-related chronic osteomyelitis.

Contraindications of Fusidic Acid

  • are allergic to betamethasone, fusidic acid, or any ingredients of this medication
  • are allergic to other corticosteroids (e.g., hydrocortisone, clobetasol)
  • have untreated infections of the skin caused by fungi or bacteria
  • have an internal fungal infection
  • have tuberculosis skin lesions or skin infections related to syphilis
  • have rosacea
  • have irritated skin around the mouth (perioral dermatitis)
  • have skin reactions after receiving vaccinations
  • have a viral disease such as herpes simplex, varicella (chickenpox), or vaccinia

Dosage Fusidic Acid

Strengths: Fusidic Acid 20mg/g Cream

The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.

For oral dosage form (tablets)

Osteomyelitis (bone and joint infections) or skin and soft tissue infections

  • Adults—500 mg (2 tablets) three times daily

For oral dosage form (suspension)

Osteomyelitis (bone and joint infections) or skin and soft tissue infections

  • Adults—15 milliliters three times daily
  • Children—Up to 1 year of age: 1 milliliter (mL) per kilogram DAILY divided into 3 equal doses; 1 to 5 years of age is 5 mL three times daily; 6 to 12 years of age is 10 mL three times daily.

For injection dosage form

Osteomyelitis (bone and joint infections) or skin and soft tissue infections

  • Adults—500 milligrams three times daily
  • Children—Up to 1 year of age to 12 years: 20 milligrams/kilogram DAILY divided into 3 equal doses, infused over at least 2 hours.

Side Effects Of Fusidic acid

More common

  • signs of a hole in the digestive system (e.g., severe abdominal pain, burning pain, nausea, vomiting, chills or fever)
  • the allergic reaction at the site of application, including redness, hives, swelling, rash, and/or itching
  • mild irritation at area of application
  • pain (only when medication is applied to deep leg ulcers)
  • skin blistering
  • symptoms of an eye infection (e.g., pink or red eyes, itchy eyes, eye discharge, crusts on the eyelids or lashes)
  • signs of a severe skin reaction such as blistering, peeling, a rash covering a large area of the body, a rash that spreads quickly, or a rash combined with fever or discomfort
  • Abnormal dreams
  • frequent urination
  • pain in the head or upper neck. সহজ বাংলা: মাথাব্যথা।" data-rx-term="headache" data-rx-definition="Headache means pain in the head or upper neck. সহজ বাংলা: মাথাব্যথা।">headache
  • itching, skin rash
  • loss of appetite
  • loss of energy or weakness
  • mental depression
  • muscle aches and pains
  • muscle trembling or twitching
  • seeing or hearing things that are not there
  • seizures
  • sore throat
  • stomach pain
  • swelling of the feet or lower legs
  • trembling and shaking of the hands
  • trouble sleeping
  • unusual bleeding or bruising
  • unusual tiredness or weakness

Common

  • signs of kidney problems (e.g., increased urination at night, decreased urine production, blood in the urine)
  • signs of liver problems (e.g., nausea, vomiting, diarrhea, loss of appetite, weight loss, yellowing of the skin or whites of the eyes, dark urine, pale stools)
  • signs of progressive multifocal leukoencephalopathy (e.g., personality changes, progressive weakness on one side of the body, changes in memory, confusion)
  • any mouth sores
  • changes in memory and orientation
  • cold or flu-like symptoms (such as fever or sore throat)
  • confusion
  • constipation
  • changes in mood or emotions
  • diarrhea
  • difficulty sleeping or nightmares
  • headache
  • loss of appetite
  • stomach pain
  • tiredness or fatigue
  • vomiting
  • weakness

Rare

  • signs of posterior encephalopathy syndrome (e.g., headache, seizures, visual disturbances, altered mental state)
  • signs of reduced red blood cells (e.g., fatigue, a general feeling of being unwell, weakness, dizziness, fainting, pale skin, pale stool)
  • swelling or tingling in your hands or feet
  • symptoms of high blood sugar (e.g., frequent urination, increased thirst, excessive eating, unexplained weight loss, poor wound healing, infections, fruity breath odor)
  • symptoms of a urinary tract infection (e.g., pain when urinating, urinating more often than usual, low back or flank pain)
  • Blurred vision
  • muscle cramps
  • numbness or pain in the legs
  • ringing in the ears
  • sweating

Drug Interactions of Fusidic Acid

Fusidic acid may interact with following drugs, supplements & may change the efficacy of drugs


Pregnancy Category of Fusidic Acid

FDA Pregnancy Category – C

Pregnancy

Fusidic acid is not approved for marketing in the United States by the U.S. Food and Drug Administration but is available in other countries as topical and systemic dosage forms. Data on excretion of fusidic acid into breastmilk are quite old and not from a well-designed study, but levels in breastmilk after intravenous fusidic acid appear to below.

Breast-feeding

Using Fusidic Acid Cream topically and breastfeeding is unlikely to harm your baby. Fusidic Acid Cream may be used during breast-feeding but you should avoid applying it on your breast. You should only breast-feed your baby while using this medicine on the advice of your doctor. There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.

References

Fusidic Acid - Uses, Dosage, Side Effects, Interactions

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Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

  • Write when the problem started and how it changed.
  • Bring old prescriptions, investigation reports, and current medicines.
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  • Bring one family member if the patient is weak, elderly, confused, or a child.

Questions to ask

  • What is the most likely cause of my symptoms?
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  • Which tests are necessary now, and which can wait?
  • How should I take medicines safely and what side effects should I watch for?
  • When should I come for follow-up?

Tests to discuss

  • Vital signs: temperature, pulse, blood pressure, oxygen saturation
  • Basic physical examination by a clinician
  • CBC, urine test, blood sugar, or imaging only when clinically needed

Avoid these mistakes

  • Do not use antibiotics, steroid tablets/injections, or strong painkillers without proper medical advice.
  • Do not hide pregnancy, kidney disease, ulcer, allergy, or blood thinner use.
  • Do not delay emergency care when danger signs are present.

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Safe first steps

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  • Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
  • Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

Avoid these mistakes

  • Do not start antibiotics without a proper medical decision.
  • Do not use steroid tablets or injections casually for quick relief.
  • Do not delay emergency care because of home remedies.

Get urgent help if

  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

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Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Medicine doctor / pediatrician for children / qualified clinician
Tests to discuss with doctor
  • Temperature chart and hydration assessment
  • CBC with platelet count if fever persists or dengue/other infection is possible
  • Urine test, malaria/dengue tests, chest evaluation, or blood culture only when clinically indicated
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?
  • Do I need antibiotics, or is this more likely viral?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Care roadmap for: Fusidic Acid – Uses, Dosage, Side Effects, Interactions

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

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Frequently Asked Questions

Is this article a replacement for a doctor?

No. It is educational content only. Patients should consult a qualified clinician for diagnosis and treatment.

When should I seek urgent care?

Seek urgent care for severe symptoms, rapidly worsening condition, breathing difficulty, severe pain, neurological changes, or any emergency warning sign.

References

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