Clindamycin (Cleocin): Uses, Warnings, and Key Facts

What is clindamycin?

Clindamycin is an active ingredient used to treat certain serious infections caused by sensitive microorganisms. The content provided for this page lists infections such as pneumonia, osteomyelitis, dental infections, skin infections, acute sinusitis, and lung abscess.

In the United States, brand names mentioned for clindamycin include Cleocin, Cleocin Phosphate, Cleocin Pediatric, and Cleocin HCl.

Available forms and ingredients

The original content lists these clindamycin-related ingredients:

• Clindamycin hydrochloride
• Clindamycin palmitate hydrochloride
• Clindamycin phosphate

How clindamycin works

Clindamycin inhibits bacterial protein synthesis at the 50S ribosomal subunit, which prevents peptide junction formation. In practical terms, this means it interferes with bacterial growth.

Therapeutic uses listed in the source content

The original material describes clindamycin as being used for serious infections caused by susceptible organisms, including the following:

In adults

• Community-acquired pneumonia caused by Staphylococcus aureus
• Aspiration pneumonia
• Community-acquired empyema
• Lung abscess
• Acute pharyngo-tonsillitis caused by Group A Streptococcus (S. pyogenes)
• Dental infections
• Skin and soft tissue infections, complicated and uncomplicated
• Osteomyelitis
• Pneumocystis jiroveci pneumonia in people with HIV
• Toxoplasmic encephalitis in people with HIV

In children over 1 month and under 18 years

• Acute sinusitis

Dosage information from the source content

The following information is included in the original text. Doses and schedules can vary by age, infection type, severity, and clinical setting, so the official leaflet and a clinician’s instructions should always be checked.

Examples of specific regimens mentioned

• Acute beta-haemolytic streptococcal and pharyngo-tonsillitis infections caused by S. pyogenes: 300 mg twice daily for 10 days.
• Pelvic inflammatory disease in hospitalized patients: initial IV treatment followed by oral treatment after improvement, with a total duration of 10–14 days.
• Pneumocystis jiroveci pneumonia in patients with HIV: oral clindamycin with primaquine for 21 days.
• Toxoplasmic encephalitis with AIDS: an initial phase followed by oral treatment with pyrimethamine and folinic acid, as listed in the source.

How it is administered

Oral use

The source says clindamycin can be taken with meals. It should be given with a full glass of water to help reduce the risk of esophageal irritation.

IM or IV use

For intravenous administration, the source states that clindamycin should be diluted before use and infused over at least 10 to 40 minutes. It also notes that the concentration should not exceed 12 mg per mL of solution.

Contraindications listed in the source

• Hypersensitivity to clindamycin or lincomycin
• Oral use: history of antibiotic-associated colitis

Warnings and precautions

The original content highlights several important precautions:

• Liver failure: caution
• Kidney failure: caution
• Risk of severe hypersensitivity reactions, including DRESS, Stevens-Johnson syndrome, toxic epidermal necrolysis, and AGEP
• Risk of overgrowth of Clostridium difficile, which may cause diarrhea or antibiotic-associated colitis
• Risk of overgrowth of non-sensitive microorganisms, including fungi
• Caution with inflammatory bowel disease such as Crohn’s disease or ulcerative colitis
• Caution with concomitant treatment with neuromuscular blockers
• Monitor renal, hepatic, and blood counts
• Not for use in meningitis
• IV administration should not be rapid because it may cause serious cardiac effects

Interactions listed in the source

Pregnancy and breastfeeding

The source advises assessing the risk-benefit balance in pregnancy. It also states that clindamycin crosses the placental barrier in humans and that animal studies showed reproductive toxicity.

For breastfeeding, the original content says clindamycin is excreted in breast milk after oral or intravenous administration and that use during lactation is contraindicated due to the potential for serious adverse reactions in the infant.

Effects on driving ability

The source states that clindamycin’s influence on the ability to drive or use machines is nil or negligible.

Adverse reactions and side effects listed in the source

• Pseudomembranous colitis
• Diarrhea
• Abdominal pain
• Alterations in liver function tests
• IM use: local irritation, pain, induration, sterile abscesses
• IV use: pain and thrombophlebitis

What to verify with a doctor or pharmacist

If clindamycin has been prescribed or discussed, it is sensible to confirm the exact formulation, route, and duration, because the source content includes several different uses and dosing patterns. It is also important to check whether any other medicines, bowel conditions, liver or kidney problems, or a history of antibiotic-associated colitis could affect suitability.

Safety reminder

If diarrhea becomes severe, persistent, or bloody, or if a rash, swelling, breathing difficulty, or other serious reaction appears, seek urgent medical advice. Always follow the official medication guide and the instructions given by the prescribing clinician.

Frequently asked questions

Source note: This page was prepared using the clinical and molecular information referenced in the original content, including FDA and USP-related ingredient resources. For the most accurate product-specific instructions, consult the official medication guide for the exact medicine you have been prescribed.