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Pfizer Healthcare Ireland

9 Riverwalk, National Digital Park, Citywest Business Campus, Dublin 24,
Telephone: +353 1 467 6500
Fax: +353 1 467 6501
Medical Information Direct Line: 1 800 633 363
Medical Information Website: http://www.pfizermedicalinformation.ie

Summary of Product Characteristics last updated on medicines.ie: 19/04/2017
SPC Dalacin C Phosphate 150 mg/ml Concentrate for Solution for Infusion or Solution for Injection 4ml

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Dalacin C Phosphate 150 mg/ml Concentrate for Solution for Infusion or Solution for Injection, 4 ml

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Each ml of solution contains clindamycin phosphate equivalent to 150 mg clindamycin, giving 300 mg clindamycin per ampoule.

Excipients with known effect

Each ml of solution contains 9.45 mg of benzyl alcohol.

For the full list of excipients, see Section 6.1.

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Concentrate for solution for infusion or solution for injection.

Clear colourless sterile solution with a pH of 5.5-7.0

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4.1 Therapeutic indications

For the management of serious infections due to organisms susceptible to this anti-infective.

Clindamycin does not penetrate the blood/brain barrier in therapeutically effective quantities.

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4.2 Posology and method of administration


Parenteral (IM or IV administration).

Dalacin C Phosphate must be diluted prior to IV administration and should be infused slowly and should be infused over at least 10-60 minutes (see 'Dilution for IV use and IV infusion rates' at the end of the section).

Dalacin C Phosphate IM administration should be used undiluted.


The usual daily adult dosage of Dalacin C Phosphate for infections of the intra-abdominal area, female pelvis, and other complicated or serious infections is 1800-2700 mg given in 2, 3, or 4 equal doses. Less complicated infections due to more susceptible microorganisms may respond to lower doses such as 1200-1800 mg/day administered in 3 or 4 equal doses. Doses of up to 4800 mg daily have been used successfully.

Single IM injections of greater than 600 mg are not recommended nor is administration of more than 1.2 g in a single one-hour infusion.

Alternatively, the drug may be administered in the form of a single rapid infusion of the first dose followed by continuous IV infusion.

Paediatric population

Children (over 1 month of age): Serious infections: 15-25 mg/kg/day in three or four equal doses.

More severe infections: 25-40 mg/kg/day in three or four equal doses. In severe infections it is recommended that children be given no less than 300 mg/day regardless of body weight.

Neonates (under 1 month of age): Dalacin C Phosphate (IM or IV administration): 15-20 mg/kg/day in 3 or 4 equal doses. The lower dosage may be adequate for small premature infants (see section 4.4).

Dosage in Elderly: Pharmacokinetic studies with Dalacin C Phosphate have shown no clinically important differences between young and elderly subjects with normal hepatic function and normal (age-adjusted) renal function after oral or intravenous administration. Therefore, dosage adjustments are not necessary in the elderly with normal hepatic function and normal (age-adjusted) renal function (see Section 5.2 Pharmacokinetic Properties).

Dosage in Renal Impairment: Dalacin C Phosphate dosage modification is not necessary in patients with renal insufficiency.

Dosage in Hepatic Impairment: Dalacin C Phosphate dosage modification is not necessary in patients with hepatic insufficiency.

Method of administration

Dilution for IV use and IV infusion rates

The concentration of clindamycin in diluent for infusion should not exceed 18 mg per mL and INFUSION RATES SHOULD NOT EXCEED 30 MG PER MINUTE. The usual infusion rates are as follows:




300 mg

600 mg

900 mg

1200 mg

50 mL

50 mL

50-100 mL

100 mL

10 min

20 min

30 min

40 min

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4.3 Contraindications

Clindamycin is contraindicated in patients previously found to be sensitive to lincomycin, clindamycin, any component of the formulation, or to any of the excipients listed in section 6.1.

Use in patients with diarrhoea or intestinal inflammatory disease.

Use concurrently with erythromycin.

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4.4 Special warnings and precautions for use

The clindamycin phosphate injectable formulation contains benzyl alcohol (9.45 mg/ml) as preservative. Intravenous administration of the preservative benzyl alcohol has been associated with serious adverse events, and death in paediatric patients including neonates characterized by central nervous system depression, metabolic acidosis, gasping respirations, cardio-vascular failure and haematological anomalies (“gasping syndrome”). Although normal therapeutic doses of this product ordinarily deliver amounts of benzyl alcohol that are substantially lower than those reported in association with the “gasping syndrome”, the minimum amount of benzyl alcohol at which toxicity may occur is not known. Use only if it is necessary and if there are no alternatives possible. If given in high volumes, should be used with caution and preferably for short term treatment in subjects with liver or kidney impairment because of the risk of accumulation and toxicity (metabolic acidosis).

Premature and low-birth weight infants may be more likely to develop toxicity.

Benzyl Alcohol containing products should not be used in pre-term or full-term neonates unless strictly necessary.

Severe hypersensitivity reactions, including severe skin reactions such as drug reaction with eosinophilia and systemic symptoms (DRESS), Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), and acute generalized exanthematous pustulosis (AGEP) have been reported in patients receiving clindamycin therapy. If a hypersensitivity or severe skin reaction occurs, clindamycin should be discontinued and appropriate therapy should be initiated (see sections 4.3 and 4.8).

Dalacin C Phosphate should only be used in the treatment of serious infections. In considering the use of Dalacin C Phosphate, the practitioner should bear in mind the type of infection and the potential hazard of the diarrhoea which may develop, since cases of colitis have been reported during, or even two or three weeks following, the administration of Dalacin C Phosphate.

Studies indicate a toxin(s) produced by clostridia (especially Clostridium difficile) is the principal direct cause of antibiotic-associated colitis. Colitis is a disease which has a clinical spectrum from mild, watery diarrhoea to severe, persistent diarrhoea, leucocytosis, fever severe abdominal cramps, which may be associated with the passage of blood and mucus. If allowed to progress, it may product peritonitis, shock and toxic megacolon. This may be fatal.

The disease is likely to follow a more severe course in older patients or patients who are debilitated. Diagnosis is usually made by recognition of the clinical symptoms, but can be substantiated by endoscopic demonstration of pseudomembranous colitis. The presence of the disease may be further confirmed by culture of the stool for Clostridia difficile on selective media and assay of the stool specimen for the toxin(s) of C. Difficile.

Treatment with antibacterial agents alters the normal flora of the colon leading to overgrowth of Clostridium difficile. This has been reported with use of nearly all antibacterial agents, including clindamycin. Clostridium difficile produces toxins A and B which contribute to the development of Clostridium difficile associated diarrhoea (CDAD) and is a primary cause of 'antibiotic-associated colitis'.

It is important to consider the diagnosis of CDAD in patients who present with diarrhoea subsequent to the administration of antibacterial agents. This may progress to colitis, including pseudomembranous colitis (see section 4.8), which may range from mild to fatal colitis. If antibiotic-associated diarrhoea or antibiotic-associated colitis is suspected or confirmed, ongoing treatment with antibacterial agents, including clindamycin, should be discontinued and adequate therapeutic measures should be initiated immediately. Drugs inhibiting peristalsis are contraindicated in this situation.

Caution should be used when prescribing Dalacin C Phosphate to individuals with a history of gastro-intestinal disease, especially colitis.

Since clindamycin does not diffuse adequately into cerebrospinal fluid, the drug should not be used in the treatment of meningitis.

If therapy is prolonged, liver and kidney function and haematology tests should be performed, and in infants under the age of one year. Safety and appropriate dosage in infants less than one month old have not been established.

The use of clindamycin phosphate may result in overgrowth of non-susceptible organisms, particularly yeasts.

Prolonged administration of Dalacin C Phosphate, as with any anti-infective, may result in super-infection due to organisms resistant to Dalacin C Phosphate.

The drug should be used with caution in patients with the atopic syndrome, particularly with asthma.

Antibiotics can reduce the efficacy of the oral contraceptive pill. Additional contraceptive precautions should be taken during treatment.

Clindamycin phosphate should not be injected intravenously undiluted as a bolus, but should be infused over at least 10-60 minutes as directed in section 4.2.

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4.5 Interaction with other medicinal products and other forms of interaction

Dalacin C Phosphate administered by injection has been shown to have neuromuscular blocking properties that may enhance the action of other neuromuscular blocking agents. Therefore it should be used with caution in patients receiving such agents.

Cross-resistance can be demonstrated with lincomycin and, particularly in the case of staphylococci, with erythromycin.

In-vitro compatibility studies monitored for 24 hours at room temperature using a concentration no greater than 6 mg/ml have demonstrated no inactivation or physical incompatibility with the use of Dalacin C Phosphate in i.v. solutions containing sodium chloride, glucose or potassium usually used clinically.

The following drugs are physically incompatible with Dalacin C Phosphate: ampicillin, phenytoin sodium, barbiturates, aminophylline, calcium gluconate, magnesium sulphate, ceftriaxone sodium, diphenylhydantoin, idarubicin hydrochloride, and ranitidine hydrochloride. Solutions of clindamycin salts have a low pH and incompatibility may reasonably be expected with alkaline preparations or with drugs unstable at low pH.

Vitamin K antagonists

Increased coagulation tests (PT/INR) and/or bleeding have been reported in patients treated with clindamycin in combination with a vitamin K antagonist (e.g. warfarin, acenocoumarol and fluindione). Coagulation tests, therefore, should be frequently monitored in patients treated with vitamin K antagonists.

Co-administration of clindamycin with inhibitors of CYP3A4 and CYP3A5. Clindamycin is metabolized predominantly by CYP3A4, and to a lesser extent by CYP3A5, to the major metabolite clindamycin sulfoxide and minor metabolite N-desmethylclindamycin. Therefore inhibitors of CYP3A4 and CYP3A5 may reduce clindamycin clearance and inducers of these isoenzymes may increase clindamycin clearance. In the presence of strong CYP3A4 inducers such as rifampicin, monitor for loss of effectiveness.

In vitro studies indicate that clindamycin does not inhibit CYP1A2, CYP2C9, CYP2C19, CYP2E1 or CYP2D6 and only moderately inhibits CYP3A4. Therefore, clinically important interactions between clindamycin and co-administered drugs metabolized by these CYP enzymes are unlikely.

4.6 Fertility, pregnancy and lactation


Oral and subcutaneous reproductive toxicity studies in rats and rabbits revealed no evidence of impaired fertility or harm to the fetus due to clindamycin, except at doses that caused maternal toxicity. Animal reproduction studies are not always predictive of human response.

Clindamycin crosses the placenta in humans. After multiple doses, amniotic fluid concentrations were approximately 30% of maternal blood concentrations.

Benzyl alcohol can cross the placenta, (see section 4.4).

In clinical trials with pregnant women, the systemic administration of clindamycin during the second and third trimesters has not been associated with an increased frequency of congenital abnormalities. There are no adequate and well-controlled studies in pregnant women during the first trimester of pregnancy.

Clindamycin should be used in pregnancy only if clearly needed.


Orally and parenterally administered clindamycin has been reported to appear in human breast milk in ranges from 0.7 to 3.8 μg/mL. Because of the potential for serious adverse reactions in nursing infants, clindamycin should not be taken by nursing mothers.


Fertility studies in rats treated orally with clindamycin revealed no effects on fertility or mating ability.

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4.7 Effects on ability to drive and use machines

Clindamycin has no or negligible influence on the ability to drive and use machines.

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4.8 Undesirable effects

The table below lists the adverse reactions identified through clinical trial experience and post-marketing surveillance by system organ class and frequency. The frequency grouping is defined using the following convention: Very common (≥1/10); Common (≥ 1/100 to <1/10); Uncommon (≥1/1,000 to <1/100); Rare (≥ 1/10,000 to <1/1,000); Very Rare (< 1/10,000); and Not known (cannot be estimated from the available data). Within each frequency grouping, undesirable effects are presented in order of decreasing seriousness.

System Organ Class


≥ 1/100 to < 1/10


≥ 1/1 000 to <1/100


≥ 1/10 000 to <1/1 000

Very Rare

< 1/10 000

Not Known

(cannot be estimated from available data)

Infections and Infestations

pseudomembranous colitis*#

clostridium difficile colitis*, vaginal infection*

Blood and Lymphatic System Disorders

agranulocytosis*, neutropenia*, thrombocytopenia*, leukopenia*, eosinophilia

Immune System Disorders

anaphylactic shock*, anaphylactoid reaction*, anaphylactic reaction*, hypersensitivity*

Nervous System Disorders


Cardiac Disorders

cardio-respiratory arrest †§,

Vascular Disorders



Gastrointestinal Disorders

diarrhoea, nausea

abdominal pain, vomiting

Hepatobiliary Disorders


Skin and Subcutaneous Tissue Disorders

rash maculopapular

urticaria erythema multiforme, pruritus

toxic epidermal necrolysis (TEN)*, Stevens Johnson syndrome (SJS)*, drug reaction with eosinophilia and systemic symptom (DRESS)*, acute generalised exanthematous pustulosis (AGEP)*, angioedema*, dermatitis exfoliative*, dermatitis bullous*, rash morbilliform*

General Disorders and Administrative Conditions

pain, injection site abscess

injection site irritation†*


liver function test abnormal

* ADR identified post-marketing.

† ADRs apply only to injectable formulations.

# See section 4.4.

§ Rare instances have been reported following too rapid intravenous administration (see section 4.2).

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via HPRA Pharmacovigilance, Earlsfort Terrace, IRL - Dublin 2; Tel: +353 1 6764971; Fax: +353 1 6762517. Website: www.hpra.ie; E-mail: medsafety@hpra.ie.

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4.9 Overdose

In cases of overdosage no specific treatment is indicated.

The serum biological half-life of clindamycin is 2.4 hours. Haemodialysis and peritoneal dialysis are not effective in removing clindamycin from the serum. If an allergic adverse reaction occurs, therapy should be with the usual emergency treatments, including corticosteroids, adrenaline and antihistamines.

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5.1 Pharmacodynamic properties

Pharmacotherapeutic group: Anti-infectives or systemic use, ATC Code: J01FF01.

Clindamycin is a lincosamide antibiotic with a primarily bacteriostatic action against Gram-positive aerobes and a wide range of anaerobic bacteria. Lincosamides such as clindamycin bind to the 50S subunit of the bacterial ribosome similarly to macrolides such as erythromycin and inhibit the early stages of protein synthesis. The action of Dalacin C Phosphate is predominantly bacteriostatic although high concentrations may be slowly bactericidal against sensitive strains.

Dalacin C Phosphate has been shown to have in vitro activity against isolates of the following organisms:

Aerobic gram-positive cocci, including:

Staphylococcus aureus;

Staphylococcus epidermidis (penicillinase and nonpenicillinase producing strains);

When tested by in vitro methods some staphylococcal strains originally resistant to erythromycin rapidly develop resistance to Dalacin C Phosphate;

Streptococci (except Streptococcus faecalis);


Anaerobic gram-negative bacilli,including:

Bacteroides species (including Bacteroides fragilis group and Bacteroides melaninogenicus group);

Fusobacterium species.

Anaerobic gram-positive non-sporeforming bacilli,including:



Actinomyces species

Anaerobic and microaerophilic gram-positive cocci, including:

Peptococcus species;

Peptostreptococcus species;

Microaerophilic streptococci.

Clostridia: Clostridia are more resistant than most anaerobes to clindamycin. Most Clostridium perfringens are susceptible, but other species, e.g., Clostridium sporogenes and Clostridium tertium are frequently resistant to clindamycin.

Most Gram-negative aerobic bacteria, including the Enterobacteriaceae, are resistant to clindamycin. Clindamycin demonstrates cross-resistance with lincomycin. When tested by in vitro methods, some staphylococcal strains originally resistant to erythromycin rapidly developed resistance to clindamycin. The mechanisms for resistance are the same as for erythromycin, namely methylation of the ribosomal binding site, chromosomal mutation of the ribosomal protein and in a few staphylococcal isolates enzymic inactivation by a plasmid-mediated adenyltransferase.

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5.2 Pharmacokinetic properties

General characteristics of active substance

Following parenteral administration, the biologically inactive clindamycin phosphate is hydrolysed to clindamycin. When the equivalent of 300 mg of Dalacin C Phosphate is injected intramuscularly, a mean peak plasma concentration of 6 microgram/ml is achieved within three hours; 600 mg gives a peak concentration of 9 microgram/ml. In children, peak concentration may be reached within one hour. When the same doses are infused intravenously, peak concentrations of 7 and 10 micrograms per ml respectively are achieved by the end of infusion.

Clindamycin is widely distributed in body fluids and tissues including bone, but it does not reach the cerebrospinal fluid in significant concentrations. It diffuses across the placenta into the fetal circulation and appears in breast milk. High concentrations occur in bile. It accumulates in leucocytes and macrophages. Over 90% of clindamycin in the circulation is bound to plasma proteins. In vitro studies in human liver and intestinal microsomes indicated that clindamycin is predominantly oxidized by CYP3A4, with minor contribution from CYP3A5, to form clindamycin sulfoxide and a minor metabolite, N-desmethylclindamycin. The half-life is 2 to 3 hours, although this may be prolonged in pre-term neonates and patients with severe renal impairment.

Clindamycin undergoes metabolism, to the active N-demethyl and sulfoxide metabolites and also some inactive metabolites. About 10% of the drug is excreted in the urine as active drug or metabolites and about 4% in the faeces; the remainder is excreted as inactive metabolites. Excretion is slow and takes place over several days, it is not effectively removed from the blood by dialysis.

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5.3 Preclinical safety data


Long term studies in animals have not been performed with Dalacin C Phosphate to evaluate carcinogenic potential.


Genotoxicity tests performed included a rat micronucleus test and an Ames Salmonella reversion test. Both tests were negative.

Impairment of fertility:

Fertility studies in rats treated orally with up to 300 mg/kg/day (approximately 1.1 times the highest recommended adult human dose based on mg/m2 ) revealed no effects on fertility or mating ability.

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6.1 List of excipient(s)

Benzyl alcohol

Disodium edetate

Sterilised water for injections

Sodium hydroxide (for pH-adjustment)

Dilute hydrochloric acid (for pH-adjustment)

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6.2 Incompatibilities

Solutions of clindamycin salts have a low pH and incompatibilities may reasonably be expected with alkaline preparations or drugs unstable at low pH. Incompatibility has been reported with: ampicillin sodium, aminophylline, barbiturates, calcium gluconate, ceftriaxone sodium, ciprofloxacin, idarubicin hydrochloride, magnesium sulfate, phenytoin sodium and ranitidine hydrochloride.

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6.3 Shelf life

Dalacin C Phosphate has a shelf-life of 24 months. Use diluted solution immediately.

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6.4 Special precautions for storage

Do not store above 25 °C. Do not refrigerate or freeze.

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6.5 Nature and contents of container

Type 1 flint colourless glass ampoule containing 4 ml sterile, aqueous solution. 5 ampoules packed in a cardboard carton, together with a leaflet.

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6.6 Special precautions for disposal and other handling

Dalacin C Phosphate has been known to be physically and chemically compatible for at least 24 hours in dextrose 5% water and sodium chloride injection solutions containing the following antibiotics in usually administered concentrations: Amikacin sulfate, aztreonam, cefamandole nafate, cephazolin sodium, cefotaxime sodium, cefoxitin sodium, ceftazidime sodium, ceftizoxime sodium, gentamicin sulfate, netilmicin sulfate, piperacillin and tobramycin.

The compatibility and duration of stability of drug admixtures will vary depending upon concentration and other conditions.

Dalacin C Phosphate is a single dose use only and any unused contents should be discarded.

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Pfizer Healthcare Ireland,

9 Riverwalk,

National Digital Park,

Citywest Business Park,

Dublin 24.

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PA 822/120/3

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Date of first authorisation:

9th September 1976

Date of last renewal:

22nd May 2006

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DA 19_1 inj 4ml IE

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Active Ingredients

   Clindamycin Phosphate