Clindamycin: Uses, Dosage & Side Effects
Lincosamide antibiotic for skin, soft tissue and throat infections
📊 Quick Facts About Clindamycin
Key Takeaways About Clindamycin
- Effective against gram-positive and anaerobic bacteria: Treats skin, soft tissue, throat, bone and joint infections, as well as dental and pelvic infections
- Alternative for penicillin-allergic patients: Clindamycin belongs to a different antibiotic class (lincosamides) and can be used when penicillins are not suitable
- Risk of Clostridioides difficile infection: Can cause severe, potentially life-threatening diarrhea – contact your doctor immediately if persistent or bloody diarrhea occurs
- Complete the full course: Stopping antibiotic treatment early promotes bacterial resistance and may cause the infection to return
- Do not combine with erythromycin or clarithromycin: These macrolide antibiotics compete for the same bacterial binding site and reduce effectiveness
What Is Clindamycin and What Is It Used For?
Clindamycin is a lincosamide antibiotic that kills and inhibits the growth of bacteria. It is primarily prescribed for infections of the throat, skin and soft tissues, but is also used for bone and joint infections, dental infections, pelvic inflammatory disease, and certain respiratory tract infections caused by susceptible organisms.
Clindamycin belongs to the lincosamide class of antibiotics, a group that also includes lincomycin. It works by binding to the 50S subunit of the bacterial ribosome, which prevents bacteria from producing proteins essential for their survival and reproduction. At standard therapeutic concentrations, clindamycin is primarily bacteriostatic (it inhibits bacterial growth), but at higher concentrations it can also be bactericidal (it kills bacteria directly).
Clindamycin has a broad spectrum of activity against gram-positive aerobic bacteria, including Staphylococcus aureus (including some methicillin-resistant strains in community settings), Streptococcus pyogenes, and Streptococcus pneumoniae. It is also highly effective against many anaerobic bacteria, making it particularly useful for mixed infections involving both aerobic and anaerobic organisms, such as intra-abdominal infections and aspiration pneumonia.
Originally derived from lincomycin, which was isolated from Streptomyces lincolnensis in the 1960s, clindamycin was developed as a more potent and better-absorbed semi-synthetic derivative. It is included on the WHO Model List of Essential Medicines, underscoring its importance as a key antibiotic in global healthcare. Clindamycin is available in several formulations including capsules, oral solution (granules reconstituted with water), and intravenous infusion solution, allowing clinicians to choose the most appropriate route depending on the severity of the infection and the patient's ability to take oral medications.
- Skin and soft tissue infections: Cellulitis, abscesses, wound infections, erysipelas
- Throat infections: Pharyngitis and tonsillitis caused by group A streptococci (as alternative to penicillin)
- Bone and joint infections: Osteomyelitis and septic arthritis
- Dental infections: Periapical abscess, periodontal infections
- Pelvic inflammatory disease: In combination with other antibiotics
- Aspiration pneumonia and lung abscesses: Due to its excellent anaerobic coverage
Clindamycin is commercially available under several brand names, including Dalacin (Pfizer), Clindamycin EQL Pharma, Clindamycin Navamedic, Clindamycin hameln, Clindamycin Abcur, and Clindamycin Actavis. Generic clindamycin is widely available and contains the same active ingredient at equivalent therapeutic doses.
What Should You Know Before Taking Clindamycin?
Before starting clindamycin, inform your doctor about any gastrointestinal conditions, liver or kidney problems, allergies to lincosamide antibiotics, pregnancy or breastfeeding status, and all other medications you are taking. Clindamycin is contraindicated in patients allergic to clindamycin or lincomycin.
Clindamycin is a powerful antibiotic, but it is not suitable for everyone. Your healthcare provider needs to carefully evaluate your medical history and current medications before prescribing it. Being transparent about your health conditions and medications helps ensure that clindamycin is safe and effective for you. The following sections detail important considerations before starting treatment.
Contraindications
You should not take clindamycin if:
- You are allergic to clindamycin or to any of the inactive ingredients in the formulation
- You are allergic to lincomycin, another lincosamide antibiotic, as cross-sensitivity exists between these drugs
If you have experienced an allergic reaction to either of these medicines in the past – manifesting as rash, swelling, difficulty breathing, or anaphylaxis – you must inform your doctor immediately. Clindamycin must not be prescribed in such cases, and an alternative antibiotic should be selected.
Warnings and Precautions
Talk to your doctor or pharmacist before taking clindamycin if any of the following apply to you:
- History of gastrointestinal disease: Patients who have had inflammatory bowel disease (Crohn's disease or ulcerative colitis), colitis, or previous episodes of Clostridioides difficile-associated diarrhea (CDAD) are at significantly increased risk of developing severe colitis during clindamycin therapy. Your doctor needs to know about any bowel conditions before prescribing this antibiotic.
- Impaired liver function: Clindamycin is extensively metabolized by the liver. In patients with moderate to severe hepatic impairment, serum levels may be higher than expected, increasing the risk of adverse effects. Liver function tests should be monitored regularly during extended treatment courses.
- Impaired kidney function: While clindamycin is primarily eliminated by the liver, renal impairment can affect drug clearance. Acute kidney injury has been reported in some patients. If you notice decreased urine output, swelling in your legs, ankles or feet, shortness of breath, or nausea, contact your healthcare provider immediately.
Clindamycin use carries a well-documented risk of causing CDAD, previously known as Clostridium difficile-associated diarrhea. This condition can range from mild diarrhea to severe, life-threatening pseudomembranous colitis. Symptoms may begin during treatment or even several weeks after the antibiotic course has been completed. Contact your doctor immediately if you develop persistent, watery, or bloody diarrhea – even if it occurs weeks after stopping clindamycin. Do not attempt to treat the diarrhea with over-the-counter antidiarrheal agents (such as loperamide) without consulting your doctor first, as these may worsen the condition.
For prolonged treatment courses (longer than 10 days), your doctor should monitor your liver function, kidney function, and blood cell counts at regular intervals. This is particularly important in patients receiving high doses or those with pre-existing organ impairment.
Pregnancy and Breastfeeding
If you are pregnant, planning to become pregnant, or breastfeeding, consult your healthcare provider before taking clindamycin.
Pregnancy: Clindamycin crosses the placenta and may potentially affect the developing fetus. It should generally be avoided during the first trimester of pregnancy, as there is insufficient safety data for this period. During the second and third trimesters, clindamycin may be used only if your doctor determines that the benefit of treatment clearly outweighs the potential risk to the fetus. Your healthcare provider will discuss alternative antibiotics whenever possible.
Breastfeeding: Clindamycin is excreted in breast milk and can potentially affect the nursing infant. Reported effects in breastfed infants include diarrhea and candidiasis (thrush). If clindamycin treatment is necessary while breastfeeding, your doctor will help you weigh the benefits of antibiotic therapy against the potential risks to your baby. In some cases, temporary interruption of breastfeeding or use of an alternative antibiotic may be recommended.
Driving and Operating Machinery
Clindamycin is not known to affect the ability to drive or operate machinery. No cognitive or psychomotor impairment has been associated with standard therapeutic doses. However, as with any medication, you should be aware of how you personally respond to the drug before engaging in activities that require full alertness, particularly if you experience side effects such as dizziness or nausea.
How Does Clindamycin Interact with Other Drugs?
Clindamycin has significant interactions with macrolide antibiotics (erythromycin, clarithromycin), neuromuscular blocking agents, and warfarin. It should not be combined with erythromycin due to antagonistic effects at the same ribosomal binding site. Concomitant use with neuromuscular blockers may enhance muscle relaxation.
Drug interactions can reduce the effectiveness of clindamycin, increase the risk of adverse effects, or alter the action of other medications you are taking. Always provide your healthcare provider with a complete list of all prescription drugs, over-the-counter medications, herbal supplements, and vitamins you use. The following table summarizes the most clinically important drug interactions with clindamycin.
| Drug / Drug Class | Type of Interaction | Effect | Clinical Recommendation |
|---|---|---|---|
| Erythromycin, Clarithromycin, Telithromycin | Antagonistic | Both drug classes bind to the 50S ribosomal subunit; concurrent use reduces antibacterial effectiveness | Avoid combination – do not use together |
| Neuromuscular blocking agents (e.g. suxamethonium, tubocurarine) | Potentiation | Enhanced neuromuscular blockade, prolonged muscle paralysis | Use with caution – inform anesthesiologist |
| Warfarin and similar anticoagulants | Pharmacodynamic | Increased bleeding risk; clindamycin may enhance anticoagulant effect by altering gut flora and vitamin K synthesis | Monitor INR closely – dose adjustment may be needed |
| Rifampicin | Enzyme induction | Rifampicin may reduce clindamycin serum levels through CYP3A4 induction | Monitor therapeutic response – higher clindamycin dose may be needed |
| CYP3A4 inhibitors (itraconazole, voriconazole, ritonavir, cobicistat) | Enzyme inhibition | May increase clindamycin serum levels, raising the risk of side effects | Monitor for adverse effects – dose reduction may be considered |
| CYP3A4 inducers (carbamazepine, phenytoin, phenobarbital, St John's Wort) | Enzyme induction | May decrease clindamycin serum levels, reducing efficacy | Monitor clinical response – may need alternative antibiotic |
Overgrowth of Non-Susceptible Organisms
As with all antibiotics, clindamycin use can lead to overgrowth of organisms that are not susceptible to the drug, particularly yeasts such as Candida species. This can result in oral thrush (white patches in the mouth) or vaginal yeast infections. If you develop symptoms suggestive of a secondary fungal infection during or after clindamycin treatment, contact your healthcare provider promptly for appropriate treatment.
What Is the Correct Dosage of Clindamycin?
Clindamycin dosage depends on the type and severity of the infection and the patient's age and weight. The typical adult oral dose is 150–450 mg every 6 hours. For children, the dose is calculated based on body weight, typically 8–25 mg/kg/day divided into 3–4 doses. Always follow your doctor's instructions exactly.
Your prescribing physician will determine the most appropriate dose of clindamycin based on several factors, including the site and severity of the infection, the susceptibility of the causative organism, your body weight, and your kidney and liver function. Clindamycin can be taken with or without food. It is essential to complete the entire prescribed course of antibiotics, even if you start to feel better before the course is finished, as stopping early may lead to incomplete eradication of the bacteria, recurrence of the infection, and development of antibiotic resistance.
Adults
Standard Oral Dosage – Adults
Mild to moderate infections: 150–300 mg every 6 hours (4 times daily)
Severe infections: 300–450 mg every 6 hours (4 times daily)
Duration: Usually 7–14 days, depending on the type of infection and clinical response. Bone and joint infections may require 4–6 weeks of treatment.
Intravenous Dosage – Adults (Hospital Setting)
Moderate infections: 600–1,200 mg/day, divided into 2–4 equal doses
Severe infections: 1,200–2,700 mg/day, divided into 2–4 equal doses
Maximum single IV dose: 600 mg over at least 20 minutes. Higher daily doses should be divided into multiple infusions.
Children
Oral Dosage – Children
The prescribing physician calculates the dose based on the child's body weight.
Mild to moderate infections: 8–16 mg/kg/day, divided into 3–4 equal doses
Severe infections: 16–25 mg/kg/day, divided into 3–4 equal doses
The oral solution (15 mg/ml) is available for children who cannot swallow capsules. It should be measured using the dosing syringe or spoon provided.
Elderly
No specific dose adjustment is generally required for elderly patients based solely on age. However, because older adults are more likely to have reduced liver or kidney function, the prescribing physician may start with a lower dose and increase gradually based on clinical response and tolerability. More frequent monitoring of liver enzymes, kidney function, and blood counts may be warranted during treatment.
Missed Dose
If you miss a dose of clindamycin, take it as soon as you remember. However, if it is nearly time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for the one you missed, as this increases the risk of side effects without providing additional therapeutic benefit.
Overdose
If you have taken more clindamycin than prescribed, or if a child has accidentally ingested the medication, contact your healthcare provider, go to the nearest emergency department, or call your local poison control center immediately. An overdose of clindamycin may cause or intensify common adverse effects such as nausea, vomiting, diarrhea, and abdominal pain. Treatment is generally supportive, as there is no specific antidote. Hemodialysis and peritoneal dialysis are not effective in removing clindamycin from the blood.
What Are the Side Effects of Clindamycin?
Common side effects of clindamycin include diarrhea, nausea, skin rash, and abnormal liver function tests. The most serious side effect is Clostridioides difficile-associated diarrhea (CDAD), which can be life-threatening. Seek immediate medical attention for persistent, watery, or bloody diarrhea, difficulty breathing, severe skin reactions, or signs of an allergic reaction.
Like all antibiotics, clindamycin can cause side effects, although not everyone who takes it will experience them. Most side effects are mild and resolve on their own once treatment is completed. However, some side effects can be serious and require immediate medical attention. It is important to be aware of both common and rare adverse effects so you can seek help promptly if needed.
- Severe, persistent or bloody diarrhea (with or without abdominal pain or fever) – this may indicate Clostridioides difficile infection (pseudomembranous colitis), which can be life-threatening
- Sudden wheezing, difficulty breathing or swallowing, swollen eyelids, face or lips, rash or itching (especially over the whole body) – these may be signs of a serious hypersensitivity reaction
- Severe skin reactions: widespread blistering, peeling skin, sores in the mouth, eyes or genitals (may indicate Stevens-Johnson syndrome or toxic epidermal necrolysis)
- DRESS syndrome: fever, skin rash, swollen lymph nodes, and effects on internal organs
- Signs of kidney problems: decreased urine output, swelling in legs, ankles or feet, shortness of breath, or nausea
Common Side Effects
- Diarrhea
- Skin rash (maculopapular rash)
- Abnormal liver function tests (elevated transaminases)
- Increased eosinophil count (eosinophilia)
Uncommon Side Effects
- Abdominal pain and cramping
- Nausea
- Vomiting
Rare / Frequency Unknown
- Clostridioides difficile-associated diarrhea and pseudomembranous colitis
- Vaginal infections (candidiasis)
- Oral thrush (Candida overgrowth)
- Decreased white blood cell counts (neutropenia, leukopenia)
- Decreased platelet count (thrombocytopenia)
- Agranulocytosis (severe drop in white blood cells)
- Altered taste (dysgeusia)
- Esophageal ulceration and esophagitis
- Jaundice
- Urticaria (hives) and itching
- Anaphylactic reactions
- Stevens-Johnson syndrome and toxic epidermal necrolysis
- DRESS syndrome (Drug Reaction with Eosinophilia and Systemic Symptoms)
- Acute kidney injury
Clindamycin can suppress normal gut flora, leading to overgrowth of resistant organisms. Fungal overgrowth may cause infections in the mouth (oral thrush) and genital area (vaginal candidiasis). These secondary infections are generally treatable with antifungal medications prescribed by your healthcare provider.
If you develop an infection with symptoms such as fever with severely deteriorating general condition, or fever with localized infection symptoms (for example, sore throat, difficulty urinating), seek medical attention promptly. A blood test can determine whether there is a deficiency of white blood cells (agranulocytosis), which is a rare but serious side effect that requires immediate treatment.
If you experience any side effects during or after clindamycin treatment, report them to your healthcare provider. Reporting side effects contributes to the ongoing monitoring of medicine safety and helps regulatory agencies continuously evaluate the benefit-risk balance of medications.
How Should You Store Clindamycin?
Store clindamycin capsules at room temperature below 25°C (77°F) in a dry place. Once reconstituted, oral solution should be used within 14 days and stored at room temperature – do not refrigerate, as cooling makes the solution difficult to pour. Keep all medications out of the sight and reach of children.
Proper storage of medications is essential to maintain their effectiveness and safety throughout the course of treatment. The following guidelines apply to the most common formulations of clindamycin:
- Capsules: Store at room temperature, below 25°C (77°F), in a dry location. Keep the capsules in their original packaging to protect them from moisture. Do not use capsules past the expiration date printed on the packaging.
- Oral solution (reconstituted): Once the granules have been mixed with water at the pharmacy, the solution has a shelf life of 14 days. Store at room temperature below 25°C. Do not refrigerate the oral solution, as cold temperatures cause it to thicken, making it difficult to pour and measure accurately.
- Intravenous solution: Storage and handling of IV formulations are managed by healthcare professionals in clinical settings. Reconstituted IV solutions should be used promptly or stored according to the product-specific stability data provided by the manufacturer.
Do not dispose of unused medications via household waste or the sewage system. Return any remaining clindamycin to your local pharmacy for proper disposal. This practice helps protect the environment and prevents accidental ingestion by others.
What Does Clindamycin Contain?
The active ingredient in clindamycin products is clindamycin (as clindamycin hydrochloride in capsules, or clindamycin palmitate hydrochloride in oral solutions). Inactive ingredients vary by formulation and manufacturer but may include lactose, starch, gelatin, and preservatives.
Understanding the composition of your medication is important, particularly if you have known allergies or intolerances to specific ingredients. The following information describes the general composition of common clindamycin formulations:
Capsules (150 mg and 300 mg)
The active substance is clindamycin (as clindamycin hydrochloride). Each hard capsule contains either 150 mg or 300 mg of clindamycin. Inactive ingredients typically include lactose monohydrate, maize starch, talc, magnesium stearate, and the capsule shell made from gelatin and colorants (such as titanium dioxide).
Oral Solution (15 mg/ml)
The active substance is clindamycin (as clindamycin palmitate hydrochloride). Each milliliter of reconstituted solution contains 15 mg of clindamycin. Inactive ingredients may include sucrose (sugar), flavoring agents, dimethicone (to reduce foaming), and ethylparaben (E 214) as a preservative.
- Sucrose (sugar): The oral solution contains sucrose. Patients with diabetes mellitus should take this into account. Good oral hygiene is also important – brush teeth at least twice daily with fluoride toothpaste to protect dental health.
- Ethylparaben (E 214): This preservative in the oral solution may cause allergic reactions in some individuals, including delayed-type reactions.
- Lactose: Capsule formulations may contain lactose. Patients with rare hereditary galactose intolerance, Lapp lactase deficiency, or glucose-galactose malabsorption should consult their doctor before taking these capsules.
Solution for Infusion (150 mg/ml)
The active substance is clindamycin (as clindamycin phosphate). Each milliliter contains 150 mg of clindamycin. The solution also contains disodium edetate, sodium hydroxide (for pH adjustment), and water for injection. This formulation is administered only in clinical settings by healthcare professionals.
Frequently Asked Questions About Clindamycin
Clindamycin is a lincosamide antibiotic prescribed for the treatment of bacterial infections. Its most common indications include infections of the throat (pharyngitis, tonsillitis), skin and soft tissues (cellulitis, abscesses, wound infections), bones and joints (osteomyelitis, septic arthritis), and dental infections. It is also used for pelvic inflammatory disease, aspiration pneumonia, and lung abscesses. Clindamycin is frequently chosen as an alternative antibiotic for patients who are allergic to penicillin, as it belongs to a chemically distinct drug class.
The most common side effects include diarrhea, skin rash, abnormal liver function tests, and an increase in certain white blood cells (eosinophilia). Abdominal pain, nausea, and vomiting are less common but can occur. The most important adverse effect to watch for is Clostridioides difficile-associated diarrhea (CDAD), which can be severe and potentially life-threatening. If you develop persistent, watery, or bloody diarrhea – during or even weeks after completing treatment – contact your healthcare provider immediately.
Yes, clindamycin is one of the most commonly prescribed alternatives for patients with a documented penicillin allergy. It belongs to the lincosamide class of antibiotics, which is chemically unrelated to penicillins and cephalosporins, so there is no cross-reactivity. Clindamycin covers many of the same gram-positive bacteria that penicillins target, making it a suitable substitute for infections such as streptococcal pharyngitis, cellulitis, and dental infections. However, you should not take clindamycin if you are allergic to clindamycin itself or to lincomycin.
Clindamycin should only be used during pregnancy when clearly necessary and under the supervision of your healthcare provider. It should generally be avoided during the first trimester due to limited safety data. During the second and third trimesters, your doctor will carefully weigh the potential benefit to you against any risk to the fetus. Clindamycin crosses the placenta, so the decision to use it during pregnancy requires a thorough clinical assessment. Alternative antibiotics with better-established safety profiles in pregnancy may be preferred when appropriate.
A standard course of oral clindamycin typically lasts between 7 and 14 days for most common infections such as skin and soft tissue infections or throat infections. The exact duration depends on the type, location, and severity of the infection, as well as your clinical response to the treatment. More serious infections such as osteomyelitis (bone infection) may require treatment courses of 4 to 6 weeks or longer. It is crucial that you complete the entire prescribed course, even if your symptoms improve before the medication is finished. Stopping antibiotics early can lead to incomplete clearance of the bacteria, recurrence of infection, and development of antibiotic-resistant strains.
There is no specific drug-alcohol interaction with clindamycin, unlike some other antibiotics such as metronidazole. However, alcohol can irritate the stomach and may worsen gastrointestinal side effects such as nausea, vomiting, and diarrhea that can occur with clindamycin. Alcohol can also impair your immune system's ability to fight infection. For these reasons, it is generally advisable to moderate or avoid alcohol consumption while recovering from a bacterial infection and taking antibiotics.
References
This article is based on the following peer-reviewed sources and international medical guidelines. All medical claims are supported by evidence level 1A or equivalent authoritative sources.
- World Health Organization (WHO). WHO Model List of Essential Medicines – 23rd List, 2023. Geneva: WHO; 2023. Available at: who.int
- European Medicines Agency (EMA). Clindamycin – Summary of Product Characteristics. EMA Product Information Database. Available at: ema.europa.eu
- U.S. Food and Drug Administration (FDA). Clindamycin Hydrochloride Capsules – FDA Prescribing Information. DailyMed/National Library of Medicine. Available at: dailymed.nlm.nih.gov
- British National Formulary (BNF). Clindamycin: Indications, dose, contra-indications, side-effects. NICE/BNF. Available at: bnf.nice.org.uk
- Stevens DL, Bisno AL, Chambers HF, et al. Practice Guidelines for the Diagnosis and Management of Skin and Soft Tissue Infections: 2014 Update by the Infectious Diseases Society of America. Clinical Infectious Diseases. 2014;59(2):e10–e52. doi:10.1093/cid/ciu296
- McDonald LC, Gerding DN, Johnson S, et al. Clinical Practice Guidelines for Clostridium difficile Infection in Adults and Children: 2017 Update by the IDSA and SHEA. Clinical Infectious Diseases. 2018;66(7):e1–e48. doi:10.1093/cid/cix1085
- Smieja M. Current indications for the use of clindamycin: A critical review. Canadian Journal of Infectious Diseases. 1998;9(1):22–28.
- Brook I. Spectrum and treatment of anaerobic infections. Journal of Infection and Chemotherapy. 2016;22(1):1–13.
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Editorial Team
This article has been written and reviewed by the iMedic Medical Editorial Team, comprising licensed specialist physicians in clinical pharmacology, infectious diseases, and internal medicine. All content is reviewed according to international medical standards and updated regularly to reflect the latest evidence-based guidelines.
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We follow the GRADE framework for evaluating evidence quality. Drug information is cross-referenced against the WHO Model List of Essential Medicines, EMA SmPCs, FDA prescribing information, and the BNF to ensure accuracy and completeness.
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