Mupironasal (Mupirocin Calcium)

Mupironasal is a topical antibiotic indicated for conditions involving Staphylococcus aureus colonisation and infection risk.

• Nasal carriage of Staphylococcus aureus (including MRSA): eradicates colonising bacteria to reduce infection risk.
• Postoperative Staphylococcal infections: prevents infection after surgical procedures by decolonising the nasal passages.
• Healthcare-associated transmission: lowers the chance of spreading Staphylococcus aureus among patients and staff.

• Mupirocin calcium inhibits bacterial isoleucyl‑tRNA synthetase, a key enzyme required for incorporation of isoleucine into nascent proteins. By blocking this step, the drug halts bacterial protein synthesis, leading to a bacteriostatic effect against susceptible Gram‑positive organisms, particularly Staphylococcus species.

Mupironasal may cause local or systemic reactions, although most users experience only mild effects.

Common Side Effects

• Nasal irritation: mild burning or stinging at the application site.
• Itching: localized pruritus within the nostrils.
• Dryness: reduced moisture of the nasal mucosa.
• Crusting: formation of small crusts after repeated use.

Serious or Rare Side Effects

• Allergic reaction: rash, swelling, or hives indicating hypersensitivity.
• Severe nasal ulceration: painful lesions requiring medical attention.
• Anaphylaxis: rare systemic reaction with breathing difficulty and hypotension.
• Systemic infection: unlikely but reported in immunocompromised patients.

Before using Mupironasal, consider the following safety measures.

• Pregnancy: consult a healthcare provider as safety data are limited.
• Breastfeeding: discuss potential risks with a clinician before use.
• Allergy: avoid if known hypersensitivity to mupirocin or calcium salts exists.
• Duration of use: limit application to the prescribed period to minimise resistance development.
• Application site: apply only to intact nasal mucosa; avoid eyes, mouth, and broken skin.
• Store at room temperature: keep in the original tube, protect from moisture and heat.

Mupironasal has a low potential for drug‑drug interactions, but certain combinations warrant caution.

Major Interactions (Avoid)

• Concurrent use with other topical antibiotics targeting the same organisms: may promote resistance.
• Systemic antibiotics with overlapping spectrum: could reduce overall efficacy.

Moderate Interactions (Monitor Closely)

• Use with nasal decongestant sprays: may alter local absorption.
• Co‑administration with immunosuppressants: increased risk of secondary infections.
• Application alongside other intranasal medications: assess for additive irritation.