Tobramycin/Dexamethasone 3mg / 1mg/ml eye drops suspension

Prevention and treatment of inflammation and prevention of infection associated with cataract surgery in adults and children aged 2 years and older.

Posology

Adults

One drop instilled into the conjunctival sac(s) every 4 to 6 hours while the patient is awake. During the initial 24 to 48 hours, the dosage may be increased to one drop every 2 hours while the patient is awake. Dosing should continue for 14 days not to exceed a maximum of 24 days. Frequency should be decreased gradually as warranted by improvement in clinical signs. Care should be taken not to discontinue therapy prematurely.

Elderly

Clinical studies have indicated dosage modifications are not required for use in the elderly.

Paediatric population

Tobramycin/Dexamethasone may be used in children 2 years of age and older at the same dose as in adults. Currently available data is described in section 5.1.

The safety and efficacy in children younger than 2 years of age have not been established, and no data are available.

Special populations

Patients with hepatic and renal impairment

Tobramycin/Dexamethasone has not been studied in these patient populations.

Method of Administration

For ocular use.

Shake the bottle well before use. To prevent contamination of the dropper tip and suspension, care should be taken not to touch the eyelids, surrounding areas, or other surfaces with the dropper tip of the bottle. Keep the bottle tightly closed when not in use. After cap is removed, if tamper evident snap collar is loose, remove before using product.

Gently closing the eyelid(s) and nasolacrimal occlusion for at least 1 minute after instillation is recommended. This may reduce the systemic absorption of medicinal products administered via the ocular route and result in a decrease in systemic side effects.

In case of concomitant therapy with other topical ophthalmic medicinal products, an interval of 5 minutes should be allowed between successive applications. Eye ointments should be administered last.

- Hypersensitivity to tobramycin, dexamethasone or to any of the excipients listed in section 6.1.

- Herpes simplex keratitis.

- Vaccinia, varicella and other viral disease of the cornea and conjunctiva.

- Mycobacterial infections of the eye caused by, but not limited to, acid-fast bacilli such as Mycobacterium tuberculosis, Mycobacterium leprae, or Mycobacterium avium.

- Fungal diseases of ocular structures or untreated parasitic eye infection.

- Untreated purulent infection of the eye.

Tobramycin/Dexamethasone is for topical use only and not for injection or oral use.

Prolonged use of topical ophthalmic corticosteroids (i.e. longer than the maximum duration used in clinical trials [24 days]) may result in ocular hypertension/glaucoma with resultant damage to the optic nerve and reduced visual acuity and visual fields defects and may also result in posterior subcapsular cataract formation.

Visual disturbance

Visual disturbance may be reported with systemic and topical corticosteroid use. If a patient presents with symptoms such as blurred vision or other visual disturbances, the patient should be considered for referral to an ophthalmologist for evaluation of possible causes which may include cataract, glaucoma or rare diseases such as central serous chorioretinopathy (CSCR) which have been reported after use of systemic and topical corticosteroids.

It is advisable that the intraocular pressure be checked frequently. This is especially important in paediatric patients receiving dexamethasone- containing products, as the risk of steroid-induced ocular hypertension may be greater in children below 6 years of age and may occur earlier than a steroid response in adults. The frequency and duration of treatment should be carefully considered, and the intraocular pressure should be monitored from the outset of treatment, recognizing the risk for earlier and greater steroid- induced intraocular pressure increases in the paediatric patients.

Cushing's syndrome and/or adrenal suppression associated with systemic absorption of ocular dexamethasone may occur after intensive or long-term continuous therapy in predisposed patients, including children and patients treated with CYP3A4 inhibitors (including ritonavir and cobicistat). In these cases, treatment should be progressively discontinued.

The risk of corticosteroid-induced raised intraocular pressure and/or cataract formation is increased in predisposed patients (e.g. diabetes).

Prolonged use may also result in secondary ocular infections due to suppression of host response. Corticosteroids may reduce resistance to and aid in the establishment of bacterial, viral, fungal or parasitic infections and mask the clinical signs of infection.

Sensitivity to topically administered aminoglycosides may occur in some patients. Severity of hypersensitivity reactions may vary from local effects to generalized reactions such as erythema, itching, urticarial, skin rash, anaphylaxis, anaphylactoid reactions, or bullous reactions. If hypersensitivity develops during use of this medicine, treatment should be discontinued.

Cross-hypersensitivity to other aminoglycosides can occur, and the possibility that patients who become sensitized to topical tobramycin may also be sensitive to other topical and/or systemic aminoglycosides should be considered.

Serious adverse reactions including neurotoxicity, ototoxicity and nephrotoxicity have occurred in patients receiving systemic aminoglycoside therapy. Caution is advised when Tobramycin/Dexamethasone eye drops are used concomitantly with systemic aminoglycosides.

Caution should be exercised when prescribing Tobramycin/Dexamethasone eye drops to patients with known or suspected neuromuscular disorders such as myasthenia gravis or Parkinson's disease. Aminoglycosides may aggravate muscle weakness because of their potential effect on neuromuscular function.

Fungal infection should be suspected in patients with persistent corneal ulceration. If fungal infection occurs, corticosteroids therapy should be discontinued.

Prolonged use of antibiotics such as tobramycin may result in overgrowth of non-susceptible organisms, including fungi. If superinfection occurs, appropriate therapy should be initiated.

Topical ophthalmic corticosteroids may slow corneal wound healing. Topical NSAIDs are also known to slow or delay healing. Concomitant use of topical NSAIDs and topical steroids may increase the potential for healing problems (see section 4.5).

In those diseases causing thinning of the cornea or sclera, perforations have been known to occur with the use of topical corticosteroids.

Tobramycin/Dexamethasone contains the preservative benzalkonium chloride. Benzalkonium chloride has been reported to cause eye irritation, symptoms of dry eyes and may affect the tear film and corneal surface. Should be used with caution in dry eye patients and in patients where the cornea may be compromised. Patients should be monitored in case of prolonged use. It is known to discolour soft contact lenses. Contact with soft contact lenses should be avoided. Patients must be instructed to remove contact lenses prior to the application of Tobramycin/Dexamethasone and wait 15 minutes after instillation of the dose before reinsertion.

No clinically relevant interactions have been described with topical ocular dosing.

Concomitant use of topical steroids and topical NSAIDs may increase the potential for corneal healing problems.

Dexamethasone is metabolized via cytochrome P450 3A4 (CYP3A4). CYP3A4 inhibitors (including ritonavir and cobicistat); may decrease dexamethasone clearance resulting in increased effects and adrenal suppression/Cushing's syndrome. The combination should be avoided unless the benefit outweighs the increased risk of systemic corticosteroid side-effects, in which case patients should be monitored for systemic corticosteroid effects.

Pregnancy

There are no or limited amount of data from the topical ocular use of tobramycin and dexamethasone in pregnant women. Tobramycin does cross the placenta into the fetus after intravenous dosing in pregnant women. Tobramycin is not expected to cause ototoxicity from in utero exposure. Prolonged or repeated corticoid use during pregnancy has been associated with an increased risk of intra-uterine growth retardation. Infants born of mothers who have received substantial doses of corticosteroids during pregnancy should be observed carefully for signs of hypoadrenalism.

Studies in animals have shown reproductive toxicity after systemic administration of tobramycin and dexamethasone. These effects were observed at exposures considered sufficiently in excess of the maximum human ocular dosage delivered from the maternal use of the product (See section 5.3).

Tobramycin/Dexamethasone is not recommended during pregnancy.

Breast-feeding

Tobramycin is excreted in human milk after systemic administration. No data is available on the passage of dexamethasone into human breast milk. It is unknown whether tobramycin and dexamethasone are excreted in human milk following topical ocular administration. It is not likely that the amount of tobramycin and dexamethasone would be detectable in human milk or be capable of producing clinical effects in the infant following topical use of the product.

A risk to the suckling child cannot be excluded. A decision must be made whether to discontinue breast-feeding or to discontinue/abstain from therapy taking into account the benefit of breast feeding for the child and the benefit of therapy for the woman.

Fertility

Studies have not been performed to evaluate the effect of tobramycin on human or animal fertility. There is limited clinical data to evaluate the effect of dexamethasone on male or female fertility (See section 5.3).

Tobramycin/Dexamethasone has no or negligible influence on the ability to drive and use machines.

No studies on the effects on the ability to drive and use machines have been performed. As with any eye drop, temporarily blurred vision or other visual disturbances may affect the ability to drive or use machines. If blurred vision occurs, the patient must wait until the vision is clear before driving or using machines.

Summary of the safety profile

In clinical studies involving over 1600 patients, tobramycin/dexamethasone eye drops, suspension was administered up to six times daily. No serious ophthalmic or systemic adverse reactions related to tobramycin/dexamethasone eye drops, suspension or components of the combination were reported in clinical studies. The most frequently reported adverse reactions with tobramycin/dexamethasone eye drops, suspension were eye pain, intraocular pressure increased, eye irritation (burning upon instillation) and eye pruritus occurring in less than 1% of patients.

Tabulated list of adverse reactions.

The following adverse reactions have been reported with tobramycin/ dexamethasone eye drops, suspension during clinical trials or during post marketing experience and are classified according to the subsequent 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), not known (cannot be estimated from the available data). Within each frequency grouping, undesirable effects are presented in order of decreasing seriousness.

Description of selected adverse reactions

The following adverse reactions have been observed following use with dexamethasone eye drops, suspension:

The following adverse reactions have been observed following use with tobramycin eye drops, solution:

* These adverse reactions were also observed with tobramycin/dexamethasone eye drops, suspension during post marketing

Prolonged use of topical ophthalmic corticosteroids may result in increased intraocular pressure with damage to the optic nerve, reduced visual acuity and visual field defects, posterior subcapsular cataract formation and delayed wound healing.

Due to the corticosteroid component, in diseases causing thinning of the cornea or sclera there is a higher risk for perforation especially after long treatments (see section 4.4).

The development of secondary infection has occurred after the use of combinations containing corticosteroids and antimicrobials. Fungal infections of the cornea are particularly prone to develop coincidentally with long term applications of steroids.

Serious adverse reactions including neurotoxicity, ototoxicity and nephrotoxicity have occurred in patients receiving systemic tobramycin therapy (see section 4.4).

Sensitivity to topically administered aminoglycosides may occur in some patients (see section 4.4).

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 the Yellow Card Scheme, Website: https://yellowcard.mhra.gov.uk or search for MHRA Yellow Card in the Google Play or Apple App Store.

Due to the characteristics of this preparation, no toxic effects are to be expected with an ocular overdose of this product, or in the event of accidental ingestion of the contents of one bottle or tube.

A topical overdose of Tobramycin/Dexamethasone may be flushed from the eye(s) with lukewarm tap water.

Pharmacotherapeutic group: Ophthalmologicals – corticosteroids and antiinfectives in combination – dexamethasone and antiinfectives, ATC code: S01CA01

Dexamethasone

The efficacy of corticosteroids for the treatment of inflammatory conditions of the eye is well established. Corticosteroids achieve their anti-inflammatory effects through suppression of vascular endothelial cell adhesion molecules, cyclooxygenase I or II, and cytokine expression. This action culminates in a reduced expression of pro-inflammatory mediators and the suppression of adhesion of circulating leukocytes to the vascular endothelium, thereby preventing their migration into inflamed ocular tissue. Dexamethasone has marked anti-inflammatory activity with reduced mineralocorticoid activity compared with some other steroids, and is one of the most potent anti- inflammatory agents.

Tobramycin

Tobramycin is a potent, broad-spectrum, rapidly bactericidal aminoglycoside antibiotic. It exerts its primary effect on bacterial cells by inhibiting polypeptide assembly and synthesis on the ribosome. Tobramycin in this combination provides antibacterial protection against susceptible bacteria.

The following MIC breakpoints, separating susceptible from intermediate susceptible organisms, and intermediate susceptible from resistant organisms, are suggested: S (≤ 4 μg/ml, R (≥ 8 μg/ml). The prevalence of resistance may vary geographically and with time for selected species and local information on resistance is desirable, particularly when treating severe infections. As necessary, expert advice should be sought when the local prevalence of resistance is such that the utility of the agent in at least some types of infections is questionable. The following information gives only an approximate guidance on probabilities whether bacteria will be susceptible to tobramycin in tobramycin/dexamethasone eye drops, suspension.

The breakpoint definitions classifying isolates as susceptible or resistant are useful in predicting clinical efficacy of antibiotics that are administered systemically. However, when the antibiotic is administered in very high concentrations topically directly on the site of infection, these breakpoint definitions may not be applicable. Most isolates that would be classified as resistant by systemic breakpoints are indeed successfully treated topically.

In vitro studies have shown tobramycin to be active against most strains of common ocular pathogens and common skin flora bacteria as listed in the table below:

^a Methicillin-susceptible (S), Methicillin-resistant (R). The beta-lactam (i.e., methicillin; penicillin) resistance phenotype is unrelated to the aminoglycoside resistance phenotype and both are unrelated to the virulence phenotypes. Some methicillin-resistant (R) S. aureus strains (MRSA) are susceptible to tobramycin (MIC: S ≤4); conversely some strains of methicillin–susceptible (S) S. aureus (MSSA) are resistant to tobramycin (MIC: S ≥8)

The frequency of methicillin resistance (R) may be up to 50 % of all staphylococci in some European countries.

Paediatric population

The safety and efficacy of tobramycin/dexamethasone eye drops, suspension in children have been established by broad clinical experience, but only limited data are available. In a clinical study of tobramycin/dexamethasone eye drops, suspension for the treatment of bacterial conjunctivitis, 29 paediatric patients, ranging in age from 1 to 17 years, were treated with 1 or 2 drops of tobramycin/dexamethasone eye drops, suspension every 4 or 6 hours for 5 or 7 days. In this study, differences in the safety profile between adult and paediatric patients were not observed.

Other information

Cross-resistance between aminoglycosides (e.g., gentamicin and tobramycin) is due to the specificity of the enzyme modifications, Adenyltransferase (ANT) and Acetyltransferase (ACC). However, cross-resistance varies between the aminoglycoside antibiotics due to the differing specificity of the various modifying enzymes. The most common mechanism of acquired resistance to aminoglycosides is antibiotic inactivation by plasmid and transposon-encoded modifying enzymes.

Tobramycin

Animal studies have shown that tobramycin is absorbed into the cornea following ocular administration. Following systemic administration to patients with normal renal function, a plasma half-life of approximately 2 hours has been observed.

Tobramycin is eliminated almost exclusively by glomerular filtration with little if any biotransformation. Plasma concentrations of tobramycin following the 2-day topical ocular regimen of tobramycin/dexamethasone eye drops, suspension were below the limit of quantification in most subjects or low (≤0.25 microgram/ml).

Dexamethasone

Following ocular administration, dexamethasone is absorbed into the eye with maximum concentrations in the cornea and aqueous humour attained within 1- 2 hours. The plasma half-life of dexamethasone is approximately 3 hours.

Dexamethasone is eliminated extensively as metabolites. Systemic exposure to dexamethasone is low following topical ocular administration of tobramycin/dexamethasone eye drops, suspension. Peak dexamethasone plasma levels after the last topical dose ranged from 220 to 888pg/ml (mean 555 ± 217pg/ml) after administration of one drop of tobramycin/dexamethasone eye drops, suspension to each eye four times per day for two consecutive days.

Safety data

The systemic toxicity profile of the two active substances has been well studied. Systemic exposure to tobramycin at toxic doses significantly above the local ocular dose may be associated with nephrotoxicity and ototoxicity. Systemic exposure to dexamethasone may be associated with effects due to glucocorticoid imbalances. In rabbits a repeated dose toxicity study of tobramycin/dexamethasone eye drops, suspension showed systemic corticosteroid effects, but since doses were significantly above the recommended doses for humans, the clinical relevance of these data is limited. This effect is considered unlikely if tobramycin/dexamethasone is used in accordance with the instructions.

Mutagenicity

In vitro and in vivo studies of both active substances, no mutagenicity potential was identified.

Teratogenicity

Tobramycin crosses the placental barrier and enters the foetal circulation and foetal fluid. In animal studies, nephrotoxicity and ototoxicity to the foetus were reported in high dose of tobramycin systemic administration to the mother during organogenesis. In other studies, where rabbits and rats received tobramycin at doses up to 100 mg/kg daily parenterally (> 400 times the maximum clinical dose), no indications of impaired fertility or adverse effects on foetus were obtained.

Animal studies have shown teratogenic effects of corticosteroids. An increased incidence of fetal anomalies and intrauterine growth disorders was observed during ocular administration of 0.1% dexamethasone in pregnant rabbits. An increase in foetal growth disorders and mortality rates was observed during the long-term administration of dexamethasone in rabbits.

Non-clinical data revealed no special hazard for humans from topical ocular exposure to tobramycin or dexamethasone based on conventional repeated- dose topical ocular toxicity studies, genotoxicity or carcinogenicity studies. Effects in non-clinical reproductive and developmental studies with tobramycin and dexamethasone were observed only at exposures considered sufficiently in excess of the maximum human ocular dosage indicating little relevance to clinical use for low-dose short-term courses of therapy.

Hydroxyethylcellulose

Benzalkonium chloride

Edetate disodium

Tyloxapol

Sodium chloride

Sodium sulfate, anhydrous

Sulfuric acid (for pH-adjustment)

Water for injections

Not applicable.

Before first opening: 2 years

After first opening: 4 weeks

This medicinal product does not require any special storage conditions.

10 mL low density polyethylene white bottle with low density polyethylene dropper and high-density polyethylene/low density polyethylene cap with a tamper evident ring. Each bottle contains 5 mL of suspension.

Pack size: One bottle of 5 mL suspension.

Any unused medicinal product or waste material should be disposed of in accordance with local requirements.