Lincosamide·Infectious Diseases - Other Antibiotics

Clindamycin

Staph/Strep infections in penicillin-allergic patients, anaerobic infections (above the diaphragm), Necrotising Fasciitis, osteomyelitis

Authority requiredPBSLINCOSAMIDEDalacin C150 mg+2

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At a glance

Max Dose

1.8 g/day

Half-life

2-3 h

High risk: C. Difficile

CRITICAL RISK

Toxin Blocker

NEC FASC

Cautions

Avoid / Cautions

History of C. difficile colitis or inflammatory bowel disease. Pregnancy Category A.

Where it stands

Rapid Summary

Overview

Highly tissue-penetrating lincosamide. Exceptional against Gram-positive aerobes (Staph/Strep) and deep anaerobes. The absolute worst offender for causing C. difficile colitis.

Clinical Focus

Used in Necrotising Fasciitis and Toxic Shock Syndrome because it halts the bacterial ribosomes from synthesizing deadly flesh-eating exotoxins.

Bottom Line

Clindamycin is a lincosamide with excellent bone and soft tissue penetration for staphylococcal and anaerobic infections, but carries the highest risk of C. difficile-associated diarrhoea among antibiotics.

Formulation & Access

Brand Names

Dalacin C

Oral Routes

Capsules (150 mg). Oral liquid.

Parenteral

Ampoules (600 mg/4 mL) for IV / IM.

Topical

Vaginal cream, topical acne lotion.

Prescribing & PBS

Authority Required (PBS).

Indications & Use

Primary

PBSTGA

Staph/Strep infections in penicillin-allergic patients, anaerobic infections (above the diaphragm), Necrotising Fasciitis, osteomyelitis.

Clinical Place

Niche role for toxin-mediated diseases or severe penicillin allergy. Outstanding bone and joint penetration.

Quick reference

Class & Role

Lincosamide — Highly tissue-penetrating lincosamide.

Route / Formulation

Capsules (150 mg). Oral liquid. (Dalacin C)

Usual Dose & Max

PO 300-450 mg QID. Max 1.8 g/day (e.g., 600 mg TDS) for adults.

Key Indication Doses

Severe Skin/Soft Tissue Infection: PO 300-450 mg QID. Necrotising Fasciitis (Adjunct): IV 600 mg TDS (Alongside high-dose Penicillin and surgical debridement). Renal Impairment: Hepatically metabolised. No dose adjustment required in CKD.

Best Uses

Key Risks

Gastrointestinal: Clostridioides difficile-associated diarrhea (CDAD) and pseudomembranous colitis. Can be fatal, especially in the elderly. HIGH — Standard antibiotic diarrhea, esophageal ulceration (if swallowed without water). Dermatological: Maculopapular rash, rare SJS. Cardiovascular: Cardiac arrest if IV push is too rapid. Must infuse over 10-30 mins.

Key Interactions

Neuromuscular blocking agents (Anaesthetics). Clindamycin has intrinsic neuromuscular blocking properties and will dangerously prolong the paralysis of surgical muscle relaxants.

Monitoring

Warn the patient: 'If you develop severe, watery, or bloody diarrhea, stop taking the capsules immediately and contact us.' Do NOT prescribe anti-diarrheals (Loperamide) as this traps the C. diff toxin in the gut, causing megacolon.

Clinical Pearl

In severe Necrotising Fasciitis ('flesh-eating disease'), Penicillin alone fails because it only works on actively dividing bacteria (the 'Eagle effect'), and the tissue is already dying from pre-formed toxins. Clindamycin ignores this and shuts down the toxin factories instantly.

Access

Authority requiredDalacin C150 mg

Brand: Dalacin C
PBS status: Authority required
Formulation: Capsules (150 mg). Oral liquid.

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