Fusidic Acid for Skin Infections (Fucidin)

Fusidic acid, commonly known by the brand name Fucidin, is a topical antibiotic used to treat bacterial skin infections such as impetigo, boils, and infected eczema. It targets bacteria like Staphylococcus aureus and Streptococcus species, preventing their growth and allowing the skin to heal.

About fusidic acid

Fusidic acid belongs to a group of antibiotics called fusidanes, derived from the fungus Fusidium coccineum. It is available as a

cream

(2% fusidic acid) for moist or weeping lesions and an

ointment

(also 2%) for dry, scaly conditions. These formulations are prescription-only in most countries and work by inhibiting bacterial protein synthesis, specifically by binding to the elongation factor G (EF-G) on the ribosome, halting bacterial replication.

Unlike broad-spectrum antibiotics, fusidic acid is narrow-spectrum, primarily effective against Gram-positive bacteria such as staphylococci and streptococci, making it ideal for common skin pathogens without disrupting normal skin flora as much. It is often used alone for mild infections or combined with oral antibiotics for more severe cases.

Before using fusidic acid

Who can use fusidic acid

Most adults and children over 1 month old can use fusidic acid cream or ointment. It is suitable for pregnant or breastfeeding women if the benefits outweigh risks, as only small amounts are absorbed systemically. Consult a doctor for use in infants under 1 month or those with liver issues.

Who should not use fusidic acid

• People with known hypersensitivity to fusidic acid or sodium fusidate.
• Those with viral skin infections (e.g., herpes, cold sores) or fungal infections, as it won’t treat these.

Using other medicines

Fusidic acid is topical, so interactions are rare. However, avoid concurrent use with other topical antibiotics unless advised. If on oral fusidic acid (rarely used), it may interact with statins like simvastatin, increasing muscle damage risk—not relevant for topical use. Inform your doctor of all medications.

Using fusidic acid with alcohol

There are no known interactions between topical fusidic acid and alcohol.

Pregnancy and breastfeeding

Topical fusidic acid is category B in pregnancy (no proven risk in humans). Minimal absorption occurs, making it generally safe during breastfeeding if applied away from nipples. Always seek medical advice.

Babies and children

Safe for children over 1 month; apply sparingly. For impetigo in children, studies show fusidic acid cream is superior to disinfectants alone, clearing infections effectively with few side effects.

How to use fusidic acid

Dosage

Apply a small amount (pea-sized for fingertip unit) to the affected area

three to four times daily

for cream, or

once or twice daily

if bandaged. Treatment duration is typically

1-2 weeks

; complete the course even if symptoms improve to prevent resistance.

Form	Application Frequency	Best For
Cream	3-4 times/day	Moist, weeping areas (e.g., impetigo)
Ointment	1-2 times/day (if bandaged)	Dry, scaly skin (e.g., infected eczema)

How to use it

1. Wash hands and clean the affected area gently with soap and water; pat dry.
2. Apply a thin layer, rubbing in gently without excessive force.
3. Wash hands after application to avoid spreading infection.
4. For larger areas, use oral antibiotics if prescribed.

If no improvement in 7 days, see a doctor—may indicate resistance or fungal cause.

If you forget to use it

Apply as soon as remembered, unless near next dose. Do not double up.

If you use too much or accidentally swallow it

Topical overuse may cause local irritation; rinse off excess. Swallowing small amounts is unlikely harmful, but contact poison control if concerned. Seek emergency help for large ingestion.

Health information

About skin infections

Bacterial skin infections often present as red, swollen, pus-filled areas. Common types include:

• Impetigo: Crusty sores, highly contagious, common in children.
• Infected eczema/dermatitis: Itchy, inflamed skin secondarily infected.
• Boils/folliculitis: Hair follicle infections.
• Infected wounds/cuts: Post-trauma or surgical.

Fusidic acid clears these by targeting sensitive staphylococci/streptococci.

Types of skin infection

Primary: Impetigo, folliculitis.
Secondary: Infected eczema, ulcers, burns.

Side effects

Most people tolerate fusidic acid well; side effects are usually mild and local:

• Common (>1/100): Rash, itching, burning, dryness at site.
• Rare: Allergic reactions (hives, swelling), worsened infection (indicating resistance).
• Very rare: Jaundice (with prolonged large-area use due to absorption).

Stop use and consult a doctor if severe irritation or no improvement occurs. Long-term use risks antibiotic resistance.

Fucidin H

Fucidin H combines fusidic acid (2%) with hydrocortisone (1%), a mild steroid, for

infected eczema with inflammation

. The steroid reduces redness, itching, and swelling alongside antibiotic action.

Product	Ingredients	Best Use
Fucidin Cream	Fusidic acid 2%	Bacterial infections without much inflammation
Fucidin H	Fusidic acid 2% + Hydrocortisone 1%	Infected, inflamed eczema/dermatitis

Use Fucidin H for 1-2 weeks max; avoid face/genitals long-term due to steroid thinning risk.

Frequently Asked Questions (FAQs)

Can I use Fucidin cream for impetigo?

Yes, apply thinly 3 times daily for 7-10 days after cleaning sores. Superior to disinfectants alone.

How quickly does fusidic acid work?

Symptoms improve in 2-3 days; full clearance in 1-2 weeks. Complete course.

Is Fucidin H stronger than regular Fucidin?

Fucidin H is for inflamed infections due to added steroid; regular for infection alone.

Can fusidic acid treat fungal infections?

No, only bacterial. Misuse worsens fungi.

What if symptoms persist?

See a doctor; may need culture/swab for resistance or alternative therapy.

Cautions

• Avoid eyes/mouth/nose; rinse if contact.
• Do not use occlusive dressings unless advised.
• Resistance risk: Use only as prescribed.
• For widespread infection, combine with systemic antibiotics.