Ciprofloxacin and Dexamethasone (Page 2 of 4)

8.2 Lactation

Risk Summary

It is not known whether ciprofloxacin and dexamethasone are present in human milk following topical otic administration.

Published literature reports the presence of ciprofloxacin in human milk after oral administration to lactating women. However, because of the minimal systemic absorption of ciprofloxacin following topical otic administration of ciprofloxacin 0.3% and dexamethasone 0.1% otic suspension, breastfeeding is not expected to result in the exposure of the infant to ciprofloxacin [see Clinical Pharmacology (12.3)].

Systemically administered corticosteroids appear in human milk.

Dexamethasone in breast milk could suppress growth, interfere with endogenous corticosteroid production, or cause other untoward effects. However, it is not known whether topical otic administration of ciprofloxacin 0.3% and dexamethasone 0.1% otic suspension could result in systemic absorption that is sufficient to produce detectable quantities of dexamethasone in human milk.

There are no data on the effects of ciprofloxacin or dexamethasone on milk production. The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for ciprofloxacin 0.3% and dexamethasone 0.1% otic suspension and any potential adverse effects on the breast-fed child from ciprofloxacin 0.3% and dexamethasone 0.1% otic suspension.

8.4 Pediatric Use

The safety and efficacy of ciprofloxacin 0.3% and dexamethasone 0.1% otic suspension have been established in pediatric patients 6 months and older (937 patients) in adequate and well-controlled clinical trials.

No clinically relevant changes in hearing function were observed in 69 pediatric patients (age 4 to 12 years) treated with ciprofloxacin 0.3% and dexamethasone 0.1% otic suspension and tested for audiometric parameters.

10 OVERDOSAGE

Due to the characteristics of this preparation, no toxic effects are to be expected with an otic overdose of this product.

11 DESCRIPTION

Ciprofloxacin 0.3% and dexamethasone 0.1% otic suspension USP, contains the quinolone antimicrobial, ciprofloxacin hydrochloride USP, combined with the corticosteroid, dexamethasone USP, in a sterile, preserved suspension for otic use. Each mL of ciprofloxacin 0.3% and dexamethasone 0.1% otic suspension contains ciprofloxacin hydrochloride USP (equivalent to 3 mg ciprofloxacin base), 1 mg dexamethasone USP, and 0.1 mg benzalkonium chloride as a preservative. The inactive ingredients are acetic acid, boric acid, edetate disodium, hydroxyethyl cellulose, purified water, sodium acetate, sodium chloride, and tyloxapol. Sodium hydroxide or hydrochloric acid may be added for adjustment of pH.

Ciprofloxacin, a quinolone antimicrobial is available as the monohydrochloride monohydrate salt of 1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinoline carboxylic acid.

The empirical formula is C17 H18 FN3 O3 ·HCl·H2 O. The molecular weight is 385.82 g/mol and the structural formula is:

ciprostructure

Figure 1: Structure of Ciprofloxacin

Dexamethasone, 9-fluoro-11(beta),17,21-trihydroxy-16(alpha)-methylpregna-1,4-diene-3,20-dione, is a corticosteroid. The empirical formula is C22 H29 FO5 . The molecular weight is 392.46 g/mol and the structural formula is:

dexstructure
(click image for full-size original)

Figure 2: Structure of Dexamethasone

12 CLINICAL PHARMACOLOGY

12.1 Mechanism of Action

Ciprofloxacin is a fluoroquinolone antibacterial [see Microbiology (12.4)]. Dexamethasone, a corticosteroid, has been shown to suppress inflammation by inhibiting multiple inflammatory cytokines resulting in decreased edema, fibrin deposition, capillary leakage and migration of inflammatory cells.

12.3 Pharmacokinetics

Following a single bilateral 4-drop (total dose = 0.28 mL, 0.84 mg ciprofloxacin, 0.28 mg dexamethasone) topical otic dose of ciprofloxacin 0.3% and dexamethasone 0.1% otic suspension to pediatric patients after tympanostomy tube insertion, measurable plasma concentrations of ciprofloxacin and dexamethasone were observed at 6 hours following administration in 2 of 9 patients and 5 of 9 patients, respectively.

Mean ± SD peak plasma concentrations of ciprofloxacin were 1.39 ± 0.880 ng/mL (n=9). Peak plasma concentrations ranged from 0.543 ng/mL to 3.45 ng/mL and were on average approximately 0.1% of peak plasma concentrations achieved with an oral dose of 250-mg. Peak plasma concentrations of ciprofloxacin were observed within 15 minutes to 2 hours post dose application.

Mean ± SD peak plasma concentrations of dexamethasone were 1.14 ± 1.54 ng/mL (n=9). Peak plasma concentrations ranged from 0.135 ng/mL to 5.10 ng/mL and were on average approximately 14% of peak concentrations reported in the literature following an oral 0.5-mg tablet dose.

Peak plasma concentrations of dexamethasone were observed within 15 minutes to 2 hours post dose application.

Dexamethasone has been added to aid in the resolution of the inflammatory response accompanying bacterial infection (such as otorrhea in pediatric patients with AOMT).

12.4 Microbiology

Mechanism of Action

The bactericidal action of ciprofloxacin results from interference with the enzyme, DNA gyrase, which is needed for the synthesis of bacterial DNA.

Resistance

Cross-resistance has been observed between ciprofloxacin and other fluoroquinolones. There is generally no cross-resistance between ciprofloxacin and other classes of anti-bacterial agents, such as beta-lactams or aminoglycosides.

Antimicrobial Activity

Ciprofloxacin has been shown to be active against most isolates of the following microorganisms, both in vitro and clinically in otic infections [see Indications and Usage (1)].

Aerobic Bacteria

Gram-positive Bacteria

Staphylococcus aureus

• Streptococcus pneumoniae

Gram-negative Bacteria

Haemophilus influenzae

Moraxella catarrhalis

• Pseudomonas aeruginosa

13 NONCLINICAL TOXICOLOGY

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Carcinogenesis

Long-term carcinogenicity studies in mice and rats have been completed for ciprofloxacin. After daily oral doses of 750 mg/kg (mice) and 250 mg/kg (rats) were administered for up to 2 years, there was no evidence that ciprofloxacin had any carcinogenic or tumorigenic effects in these species. No long-term studies of ciprofloxacin 0.3% and dexamethasone 0.1% otic suspension have been performed to evaluate carcinogenic potential.

Long-term studies have not been performed to evaluate the carcinogenic potential of topical otic dexamethasone.

Mutagenesis

Eight in vitro mutagenicity tests have been conducted with ciprofloxacin, and the test results are listed below:

  • Salmonella /Microsome Test (Negative)

  • E. coli DNA Repair Assay (Negative)

  • Mouse Lymphoma Cell Forward Mutation Assay (Positive)

  • Chinese Hamster V79 Cell HGPRT Test (Negative)

  • Syrian Hamster Embryo Cell Transformation Assay (Negative)

  • Saccharomyces cerevisiae Point Mutation Assay (Negative)

  • Saccharomyces cerevisiae Mitotic Crossover and Gene Conversion Assay (Negative)

  • Rat Hepatocyte DNA Repair Assay (Positive)

    Thus, 2 of the 8 tests were positive, but results of the following 3 in vivo test systems gave negative results:

  • Rat Hepatocyte DNA Repair Assay

  • Micronucleus Test (Mice)

  • Dominant Lethal Test (Mice)

Dexamethasone has been tested for in vitro and in vivo genotoxic potential and shown to be positive in the following assays: chromosomal aberrations, sister-chromatid exchange in human lymphocytes, and micronuclei and sister-chromatid exchanges in mouse bone marrow. However, the Ames/Salmonella assay, both with and without S9 mix, did not show any increase in His+ revertants.

Impairment of Fertility

Fertility studies performed in male and female rats at oral doses of ciprofloxacin up to 100 mg/kg (approximately 482 times the ROHD of ciprofloxacin based on BSA) revealed no evidence of impairment. Male rats received oral ciprofloxacin for 10 weeks prior to mating and females were dosed for 3 weeks prior to mating through GD 7.

The effect of dexamethasone on fertility has not been investigated following topical otic application. However, the lowest toxic dose of dexamethasone identified following topical dermal application was 1.802 mg/kg in a 26-week study in male rats and resulted in changes to the testes, epididymis, sperm duct, prostate, seminal vesicle, Cowper’s gland, and accessory glands. The relevance of this study for short-term topical otic use is unknown.

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