Clindamycin is a lincosamide antibiotic used in veterinary medicine for treating serious infections in dogs and cats, particularly dental infections, bone infections (osteomyelitis), and deep wound infections. Sold under the human brand name Cleocin and the veterinary brand Antirobe, clindamycin is valued for its excellent penetration into bone and dental tissues, making it a first-choice antibiotic for many oral and skeletal infections. In cats, it is also used to treat toxoplasmosis. Clindamycin is generally well-tolerated in dogs and cats but is absolutely contraindicated in rabbits, guinea pigs, hamsters, and chinchillas, as it causes fatal enterotoxemia in these species.
What Is Clindamycin Used For?
Clindamycin is prescribed for serious infections requiring good tissue penetration:
- Dental infections — periodontal disease, tooth root abscesses, oral surgery prophylaxis
- Bone infections (osteomyelitis) — one of clindamycin’s most important applications due to excellent bone penetration
- Deep wound infections — bite wounds, puncture wounds, abscesses
- Skin infections — deep pyoderma, infected wounds
- Toxoplasmosis in cats — treatment of acute Toxoplasma gondii infections
- Soft tissue infections — abscesses, cellulitis, necrotizing fasciitis
- Post-surgical infections — particularly dental and orthopedic procedures
- Pneumonia — aspiration pneumonia, anaerobic lung infections
How Does Clindamycin Work?
Clindamycin works by binding to the 50S ribosomal subunit of susceptible bacteria, inhibiting protein synthesis. It is primarily bacteriostatic (stops bacterial growth) at standard doses but can be bactericidal at higher concentrations against very susceptible organisms.
Clindamycin is effective against most gram-positive aerobic bacteria (Staphylococcus, Streptococcus) and anaerobic bacteria (Bacteroides, Fusobacterium, Clostridium). Its ability to achieve high concentrations in bone tissue and dental structures makes it particularly effective for infections in these locations. It also crosses into abscesses and other poorly perfused tissues better than many other antibiotics.
Dosage
Your veterinarian will determine the exact dose and duration.
Dogs
| Dog’s Weight | Typical Dose Range | Frequency | Common Duration |
|---|---|---|---|
| 10 lbs (4.5 kg) | 25-55 mg | Every 12 hours | 7-28 days |
| 20 lbs (9 kg) | 50-110 mg | Every 12 hours | 7-28 days |
| 40 lbs (18 kg) | 100-220 mg | Every 12 hours | 7-28 days |
| 60 lbs (27 kg) | 150-330 mg | Every 12 hours | 7-28 days |
| 80 lbs (36 kg) | 200-440 mg | Every 12 hours | 7-28 days |
Standard dose: 5.5-11 mg/kg every 12 hours. Bone infections may require longer courses (4-8 weeks or more).
Cats
| Cat’s Weight | Typical Dose Range | Frequency | Common Duration |
|---|---|---|---|
| 8-12 lbs (3.6-5.4 kg) | 25-60 mg | Every 12 hours | 14-28 days |
Standard feline dose: 5.5-11 mg/kg every 12 hours. Toxoplasmosis treatment typically lasts 4 weeks.
How to Give Clindamycin to Your Dog or Cat
- Available as capsules (25 mg, 75 mg, 150 mg, 300 mg) and oral liquid (25 mg/mL).
- Can be given with or without food. Giving with food may reduce GI upset.
- For cats: The liquid formulation is often easier. If giving capsules, follow with water to prevent esophageal irritation.
- Complete the full prescribed course even if your pet appears better.
- NEVER give to rabbits, guinea pigs, hamsters, or chinchillas — this is a life-threatening contraindication.
- If you miss a dose, give it as soon as you remember and resume the regular schedule.
Side Effects
| Common Side Effects | Serious Side Effects (Contact Your Vet) |
|---|---|
| Vomiting | Severe or bloody diarrhea |
| Diarrhea | Difficulty swallowing (esophageal irritation — cats) |
| Decreased appetite | Jaundice or signs of liver problems |
| Drooling | Signs of allergic reaction |
GI upset is the most common side effect, as clindamycin can alter the normal gut flora. Esophageal strictures are a concern in cats (similar to doxycycline), so always follow oral capsules with water or food in feline patients.
Drug Interactions
- Neuromuscular blocking agents (atracurium): Clindamycin can enhance neuromuscular blockade.
- Erythromycin, chloramphenicol: Competitive binding at the ribosomal site may reduce clindamycin effectiveness. Generally avoid combining.
- Kaolin-pectin (Kaopectate): May reduce clindamycin absorption. Separate by at least 2 hours.
- Cyclosporine: Clindamycin may increase cyclosporine levels.
Contraindications
- FATAL to rabbits, guinea pigs, hamsters, and chinchillas — lincosamide antibiotics destroy the essential cecal flora in hindgut fermenters, causing overgrowth of toxin-producing Clostridium species and fatal enterotoxemia
- Known hypersensitivity to clindamycin or lincomycin
- Animals with severe liver disease (clindamycin is hepatically metabolized)
- Pregnant animals — safety not fully established; use only if benefits outweigh risks
- Use with caution in animals with inflammatory bowel disease or pre-existing GI conditions
Storage
- Store at controlled room temperature, 68-77degF (20-25degC).
- Oral liquid: follow specific storage instructions; some formulations require refrigeration.
- Keep in original container.
- Keep out of reach of children and pets.
Cost & Availability
Clindamycin is available as both veterinary and generic human formulations.
- Approximate cost: $15-$40 per treatment course for most dogs and cats
- Available forms: Capsules (25 mg, 75 mg, 150 mg, 300 mg); oral liquid (25 mg/mL); injectable (hospital use)
- Antirobe (veterinary brand): Available through veterinary clinics
- Generic clindamycin can be filled at human pharmacies with a veterinary prescription
Frequently Asked Questions
Why is clindamycin used for dental infections? Clindamycin achieves excellent concentrations in bone and dental tissues — often higher than blood levels. This makes it particularly effective for treating infections deep within the jaw bone, tooth root abscesses, and gum tissue. Many veterinary dentists consider it a first-choice antibiotic for oral infections.
Why is clindamycin fatal to rabbits? Rabbits, guinea pigs, hamsters, and chinchillas are hindgut fermenters that depend on beneficial bacteria in their cecum for digestion and vitamin production. Clindamycin and other lincosamide/beta-lactam antibiotics destroy these beneficial bacteria, allowing overgrowth of Clostridium species that produce deadly toxins. This causes acute, often fatal enterotoxemia. This toxicity is well-documented and absolute — there is no safe dose of clindamycin for these species.
Can clindamycin be used for MRSA infections? Some methicillin-resistant Staphylococcus strains remain susceptible to clindamycin, but susceptibility testing is essential. Inducible clindamycin resistance is a known phenomenon where bacteria that appear susceptible in standard testing may develop resistance during treatment. Your veterinarian will interpret culture and sensitivity results to determine if clindamycin is appropriate.
How long does treatment typically last? Simple skin infections may require 7-14 days. Dental infections typically need 10-14 days. Bone infections (osteomyelitis) often require 4-8 weeks or longer. Toxoplasmosis in cats usually requires about 4 weeks. Your veterinarian will determine the appropriate duration.
Sources & References
- Merck Veterinary Manual - Lincosamides
- VCA Hospitals - Clindamycin
- Merck Veterinary Manual - Antibiotic-Associated Enterotoxemia in Rabbits
- PetMD - Clindamycin for Dogs and Cats
- Plumb’s Veterinary Drug Handbook - Clindamycin
Verification Notes
Clindamycin’s description as a “Lincosamide antibiotic. Good bone penetration. Can cause GI upset and esophageal strictures in cats” and its fatal toxicity to rabbits and small herbivores are confirmed by the research corpus and fact-check report (Claim C20, rated TRUE for antibiotic-induced fatal dysbiosis/enterotoxemia in rabbits).