Ximaract

Antibiotic prophylaxis of postoperative endophthalmitis after cataract surgery (see section 5.1).

Consideration should be given to official guidance on the appropriate use of antibacterial agents, including guidance on antibiotic prophylaxis in eye surgery.

Intracameral use. One vial for single-use only.

Posology

Adults:

The recommended dose is 0.1 ml of reconstituted solution (see section 6.6), i.e. 1 mg of cefuroxime.

THE RECOMMENDED DOSE MUST NOT BE EXCEEDED (see section 4.9).

Paediatric population

The optimal dose and the safety of Ximaract have not been established in the paediatric population.

Elderly:

No dose adjustment is necessary.

Patients with hepatic and renal impairment:

Considering the low dose and the expected negligible systemic exposure to cefuroxime using Ximaract, no dose adjustment is necessary.

Method of administration

Ximaract must be administered after reconstitution by intraocular injection in the anterior chamber of the eye (intracameral use), by an ophthalmic surgeon, in the recommended aseptic conditions of cataract surgery. Only sodium chloride 9 mg/ml (0.9 %) solution for injection must be used when reconstituting Ximaract (see section 6.6).

After reconstitution, Ximaract should be inspected visually for particulate matter and discoloration prior to administration.

At the end of the cataract surgery, 0.1 ml of the reconstituted solution should be slowly injected into the anterior chamber of the eye.

Each vial should only be used for the treatment of a single eye.

The vial contains more than the recommended dose of 1 mg (equivalent to 0.1 ml). The extractable reconstituted volume (5 ml) is not to be used in total.

Injection of the entire volume will result in an overdose.

After injection any unused product must be discarded.

For instructions on reconstitution of the medicinal product before administration, see section 6.6.

Hypersensitivity to the active substance or to the cephalosporin group of antibiotics

Treatment with Ximaract is for intracameral use only.

Special care is indicated in patients who have experienced an allergic reaction to penicillins or any other beta-lactam antibiotics as cross-reactions may occur.

In patients at risk for infections with resistant strains, e.g. those with known previous infection or colonisation with MRSA (Methicillin-resistant Staphylococcus aureus), alternative prophylactic antibiotic should be considered.

In the absence of data for special patient groups (patients with severe risk of infection, patients with complicated cataracts, patients having combined operations with cataract surgery, patients with severe thyroid disease, patients with less 2,000 corneal endothelial cells), Ximaract should only be used after careful risk/benefit assessment.

The use of cefuroxime should not be regarded as an isolated measure but other circumstances are also of importance like prophylactic antiseptic treatment.

Corneal endothelial toxicity has not been reported at the recommended concentration of cefuroxime; nevertheless, this risk cannot be excluded and in the post-surgical surveillance, physicians should have in mind this potential risk.

No interaction studies have been performed.

Since the systemic exposure is expected to be negligible, systemic interactions are unlikely.

No incompatibility with most commonly used medicinal products in cataract surgery was reported in the literature.

Pregnancy

There are limited amount of data from the use of cefuroxime in pregnant woman. Animal studies do not show any harmful effects on embryonal and foetal development. Cefuroxime reaches the embryo/foetus via the placenta. No effects during pregnancy are anticipated, since systemic exposure to cefuroxime using Ximaract is negligible. Ximaract can be used during pregnancy.

Breastfeeding

Cefuroxime is expected to be excreted in human milk in very small quantities. Adverse effects at therapeutic doses are not expected after Ximaract use. Cefuroxime can be used during breastfeeding.

Fertility

There are no data on the effects of cefuroxime sodium on fertility in humans. Reproductive studies in animals have shown no effects on fertility.

Not relevant.

No particular adverse reactions were reported in the literature when cefuroxime is administered as intraocular injection except the following:

Immune system disorders

Very rare (<1/10,000): Anaphylactic reaction.

Eye disorders

Not known (frequency cannot be estimated from the available data): Macular oedema.

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 Yellow Card Scheme

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

The reported cases of overdose are those described in the literature after incorrect dilution and non-authorised use of cefuroxime intended for systemic administration.

Inadvertent high-dose (3-fold the recommended dose) intracameral cefuroxime was administered to 6 patients following an incorrect dilution due to homemade cefuroxime dilution protocol. These injections did not cause any detectable adverse effect in any patient even on ocular tissues.

Toxicity data were available following intracameral injection, during cataract surgery, of 40 to 50-fold the recommended dose of cefuroxime in 6 patients after a dilution error. Initial mean visual acuity was 20/200. Severe anterior segment inflammation was present, and retinal optical coherence tomography showed extensive macular oedema. Six weeks after surgery, mean visual acuity reached 20/25. Macular optical coherence tomography profile returned to normal. A 30 % decrease of scotopic electroretinography was, however, observed in all patients.

Administration of incorrectly diluted cefuroxime (10-100 mg per eye) to 16 patients resulted in ocular toxicity including corneal oedema resolving in weeks, transient raised intraocular pressure, loss of corneal endothelial cells and changes in the electroretinography. A number of these patients had permanent and severe vision loss.

Pharmacotherapeutic group: Sensory Organs - Ophthalmologicals - Antiinfectives - Antibiotics, ATC code: S01AA27

Mechanism of action

Cefuroxime inhibits bacterial cell wall synthesis following attachment to penicillin binding proteins (PBPs). This results in the interruption of cell wall (peptidoglycan) biosynthesis, which leads to bacterial cell lysis and death.

Pharmacodynamic effects

For cephalosporins, the most important pharmacokinetic-pharmacodynamic index correlating with in vivo efficacy has been shown to be the percentage of the dosing interval (% T) that the unbound concentration remains above the minimum inhibitory concentration (MIC) of cefuroxime for individual target species (i.e. % T>MIC).

After intracameral injection of 1 mg cefuroxime, cefuroxime levels in the aqueous humour were over MIC for several relevant species for up to 4-5 hours after surgery.

Mechanism of resistance

Bacterial resistance to cefuroxime may be due to one or more of the following mechanisms:

• Hydrolysis by beta-lactamases. Cefuroxime may be efficiently hydrolysed by certain of the extended-spectrum beta-lactamases (ESBLs) and by the chromosomally-encoded (AmpC) enzyme that may be induced or stably de-repressed in certain aerobic gram-negative bacterial species;

• Reduced affinity of penicillin-binding proteins for cefuroxime;

• Outer membrane impermeability, which restricts access of cefuroxime to penicillin binding proteins in gram-negative bacteria;

• Bacterial drug efflux pumps.

Methicillin-resistant staphylococci (MRS) are resistant to all currently available β -lactam antibiotics including cefuroxime.

Penicillin-resistant Streptococcus pneumoniae are cross-resistant to cephalosporins such as cefuroxime through alteration of penicillin binding proteins.

Beta-lactamase negative, ampicillin resistant (BLNAR) strains of H. influenzae should be considered resistant to cefuroxime despite apparent in vitro susceptibility.

Breakpoints

The list of micro-organisms presented hereafter has been targeted to the indication (see section 4.1).

Ximaract should be used for intracameral application only and should not be used to treat systemic infections (see section 5.2); clinical breakpoints are not relevant for this route of administration. Epidemiological cut-off values (ECOFF), distinguishing the wild-type population from isolates with acquired resistance traits are as follows:

Susceptibility of staphylococci to cefuroxime is inferred from the methicillin susceptibility.

The susceptibility of streptococcus groups A, B, C and G can be inferred from their susceptibility to benzylpenicillin.

Information from clinical trials

An academic prospective randomized partially masked multicentre cataract surgery study was performed on 16,603 patients. Twenty-nine patients (24 in “ without cefuroxime” groups and 5 in “ intracameral cefuroxime” groups) presented with endophthalmitis, of whom 20 (17 in “ without cefuroxime” groups and 3 in “ intracameral cefuroxime” groups) were classified as having proven infective endophthalmitis. Among these 20 proven endophthalmitis: 10 patients are in group “ placebo eye drops and without cefuroxime” , 7 patients in group “ levofloxacine eye drops and without cefuroxime” , 2 patients in group “ placebo eye drops and intracameral cefuroxime” and 1 patient in group “ levofloxacine eye drops and intracameral cefuroxime. The administration of intracameral cefuroxime prophylactic regimen at 1 mg in 0.1 ml sodium chloride 9 mg/ml (0.9 %) solution for injection was associated with a 4.92-fold decrease in the risk for total postoperative endophthalmitis.

Two prospective studies (Wedje 2005 and Lundströ m 2007) and 5 retrospective studies were supportive to the pivotal ESCRS study further substantiating the efficacy of intracameral cefuroxime in postoperative endophthalmitis.

The systemic exposure following intracameral injection has not been studied but is expected to be negligible.

After intracameral injection at the recommended single dose of 0.1 ml of a 10 mg/ml solution of cefuroxime in cataract patients, the mean intracameral level of cefuroxime was 2,614 + 209 mg/l (10 patients) 30 seconds and 1,027 + 43 mg/l (9 patients) 60 minutes after drug administration.

Effects in non-clinical studies were observed only at exposures considered sufficiently in excess of the maximum human exposure indicating little relevance to clinical use.

Intravitreal injection of 1 mg cefuroxime in albino rabbits resulted in levels of 19-35 mg/l and 600-780 mg/l after 30 min following injection in the aqueous and in the vitreous, respectively. Levels after 6 h decreased to 1.9-7.3 and 190-260 mg/l respectively in these two structures. There was no increase in the intraocular pressure during the first 3 days. Histopathology showed no degenerative changes compared to saline.

ERG: a-, b- and c- waves diminished up until 14 days both in the control and antibiotic-injected eyes.

Recovery occurred and may be slower than in control. ERG showed no definite changes suggestive of retinal toxicity up to 55 days after intravitreal administration.

None.

This medicinal product must not be mixed with other medicinal products except those mentioned in section 6.6.

3 years.

After reconstitution: the product should be used immediately.

Do not store above 25 ° C. Keep the vial in the outer carton, in order to protect from light.

From a microbiological point of view, unless the method of opening/reconstitution/dilution precludes the risk of microbial contamination, the product should be used immediately. If not used immediately, in-use storage times and conditions are the responsibility of the user.

Clear, transparent glass vial (Type III or I), closed with a bromobutyl rubber stopper with an aluminium / plastic flip-off overseal.

Box of 1 vial, 10 vials, 25 vials or 1 vial together with 1 sterile filter needle, 10 vials together with 10 sterile filter needles, 25 vials together with 25 sterile filter needles

Not all pack sizes may be marketed.

To prepare the product for intracameral administration, a sterile needle (18G x 1½ ” , 1.2 mm x 40 mm) with 5-micron filter (acrylic co-polymer membrane) must be used.

For details on the required medical devices and solvent, please refer to section 6.6.

Ximaract must be administered by intracameral injection, by an ophthalmic surgeon in the recommended aseptic conditions of cataract surgery.

FOR SINGLE USE ONLY.

Each vial should only be used for the treatment of a single eye. The flag label of the vial should be stuck on the patient's file, as applicable.

To prepare the product for intracameral administration, please adhere to the following instructions:

1. The integrity of the flip-off cap should be checked before withdrawing it

2. Before inserting a sterile needle, the outer part of the rubber stopper of the vial should be disinfected.

3. The needle should be pushed vertically into the centre of the vial stopper, keeping the vial in an upright position. Then, 5 ml of sodium chloride 9 mg/ml (0.9 %) solution for injection must be injected into the vial using aseptic technique.

4. The solution should be shaken gently until it is clear, colourless to yellowish and free from visible particles.

5. A sterile needle (18G x 1½ ” , 1.2 mm x 40 mm) with 5-micron filter (acrylic co-polymer membrane) must be assembled onto a 1 ml sterile syringe. This syringe should be pushed vertically into the centre of the vial stopper while keeping the vial in an upright position.

6. At least 0.1 ml of the solution should be aseptically aspired. The remaining reconstituted solution in the vial (4.9 ml) must be discarded.

7. The 5-micron filter needle should be disconnected from the syringe and the syringe should be assembled with an appropriate anterior chamber cannula.

8. The air, as well as the excess drug, must be carefully expelled from the syringe by slowly depressing the plunger so that the plunger tip aligns with the line that marks 0.1 ml on the syringe. The syringe is ready for injection.

After use, the remaining reconstituted solution must be discarded. It must not be kept for subsequent use.

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

Discard used needles in a sharps container.