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Date: Wednesday, May 29, 2024 18:49

Description: MSD-AH
Release 2.44
Posatex® ear drops suspension for dogs
Species: Dogs
Therapeutic indication: Pharmaceuticals: Antimicrobials: Topical preparations: Ear/eye/nose
Active ingredient: Mometasone Furoate, Orbifloxacin, Posaconazole
Product:Posatex® ear drops suspension for dogs
Product index: Posatex®
Withdrawal notes: Zero days
Qualitative and quantitative composition
Active substances:
Orbifloxacin 8.5 mg/mL
Mometasone furoate (as monohydrate) 0.9 mg/mL
Posaconazole 0.9 mg/mL
Paraffin liquid
For the full list of excipients, see section “Pharmaceutical particulars”.
Pharmaceutical form
Ear drops suspension.
White to off-white viscous suspension
Clinical particulars
Target Species
Indications for use
Treatment of acute otitis externa and acute exacerbations of recurrent otitis externa, associated with bacteria susceptible to orbifloxacin and fungi susceptible to posaconazole, in particular Malassezia pachydermatis.
Do not use if the eardrum is perforated.
Do not use in case of hypersensitivity to the active substances, to any of the ingredients, to corticosteroids, to other azole antifungal agents or to other fluoroquinolones.
Do not use during the whole or part of the pregnancy.
Special warnings for each target species
Bacterial and fungal otitis is often secondary in nature. The underlying cause should be identified and treated.
Special precautions for use
Heavy reliance on a single class of antibiotic may result in the induction of resistance in a bacterial population. It is prudent to reserve fluoroquinolones for the treatment of clinical conditions, which have responded poorly or are expected to respond poorly to other classes of antibiotics.
Use of the product should be based on susceptibility testing of isolated bacteria, and/or other appropriate diagnostic tests.
Quinolone class veterinary medicinal products have been associated with cartilage erosions in weight-bearing joints and other forms of arthropathy in immature animals of various species. Therefore do not use in animals less than 4 months of age.
Prolonged and intensive use of topical corticosteroids preparation is known to trigger local and systemic effects, including suppression of adrenal function, thinning of the epidermis and delayed healing. See section 4.10.
Before the veterinary medicinal product is applied, the external auditory canal must be examined thoroughly to ensure that the ear drum is not perforated in order to avoid the risk of transmission of the infection to the middle ear and to prevent damage to the cochlear and vestibular apparatus.
Operator warnings
Wash hands carefully after applying the veterinary medicinal product. Avoid skin contact. In case of accidental exposure, rinse the affected area with copious quantities of water.
Adverse Reactions
Mild erythematous lesions have been observed.
The use of auricular preparations may be associated with hearing impairment, usually temporary, and primarily in geriatric dogs.
Use during pregnancy or lactation
Do not use during the whole or part of the pregnancy.
The use of the veterinary medicinal product is not recommended during lactation.
Laboratory studies in puppies have shown evidence of arthropathy after systemic administration of orbifloxacin. Fluoroquinolones are known to cross the placenta and to be distributed into milk.
Studies to determine the effect of orbifloxacin on fertility in dogs have not been conducted.
Do not use in breeding animals.
No clinical data available.
Amounts to be administered and administration route
Auricular use.
One drop contains 267 µg orbifloxacin, 27 µg mometasone furoate and 27 µg posaconazole.
The external ear canal should be meticulously cleaned and dried before treatment. Excess hair around the treatment area should be cut.
Shake well before use.
Dogs weighing less than 2 kg, apply 2 drops to the ear once a day.
Dogs weighing 2 - 15 kg, apply 4 drops to the ear once a day.
Dogs weighing 15 kg or more, apply 8 drops to the ear once a day.
Treatment should continue for 7 consecutive days.
After application, the base of the ear may be massaged briefly and gently to allow the veterinary medicinal product to penetrate the lower part of the ear canal.
Administration of the recommended dose (4 drops per ear) 5 times daily for 21 consecutive days to dogs weighing 7.6 to 11.4 kg bodyweight caused a slight decrease in serum cortisol response after adrenocorticotropic hormone (ACTH) administration in an ACTH stimulation test. Discontinuation of treatment will result in a complete return to normal adrenal response.
Withdrawal periods
Not applicable.
Pharmacological particulars
ATC Vet Code: QS02CA91
Pharmacotherapeutic group
Otologic - Corticosteroids and anti-infectives in combination.
Pharmacodynamic properties
Orbifloxacin is a synthetic broad-spectrum bactericidal agent classified as a quinolone carboxylic acid derivative, or more specifically, a fluoroquinolone. The bactericidal action of orbifloxacin results from interference with the enzymes DNA topoisomerase II (DNA-gyrase) and DNA topoisomerase IV which are needed for the synthesis and maintenance of bacterial DNA. Such impairment disrupts replication of the bacterial cell, leading to rapid cell death. The rapidity and extent of killing are directly proportional to the drug concentration. Orbifloxacin has in vitro activity against a wide range of Gram-positive and Gram-negative organisms.
Mometasone furoate is a corticosteroid with high topical potency but little systemic effect. Like other topical corticosteroids, it has anti-inflammatory and anti-pruritic properties.
Posaconazole is a broad-spectrum triazole antifungal agent. The mechanism by which posaconazole exerts fungicidal action involves the selective inhibition of the enzyme lanosterol 14-demethylase (CYP51) involved in ergosterol biosynthesis in yeasts and filamentous fungi. In in vitro tests, posaconazole has shown fungicidal activity against most of the approximately 7,000 strains of yeast and filamentous fungi tested. Posaconazole is 40 – 100 times more potent in vitro against Malassezia pachydermatis than clotrimazole, miconazole and nystatin.
Resistance to fluoroquinolones occurs by chromosomal mutation with three mechanisms: Decrease of the bacterial wall permeability, expression of efflux pump, or mutation of enzymes responsible for the molecule’s binding site. Cross-resistance across the fluoroquinolone class of antibiotics is common. Malassezia pachydermatis resistance to azoles, including posaconazole, has not been reported.
The in vitro activity of orbifloxacin against pathogens isolated from clinical cases of canine otitis externa in an EU field trial conducted in 2000 - 2001 was:
Minimum Inhibitory Concentrations vs.Orbifloxacin-Summary
E Coli
Proteus mirabilis
Pseudomonas aeruginosa
Staphylococcus intermedius
Stretococcus-β-haemolyticus G
Pharmacokinetic particulars
Systemic absorption of the active ingredients was determined in single-dose studies with [14C]-orbifloxacin, [3H]-mometasone furoate and [14C]-posaconazole contained within the Posatex formulation and placed into the ear canals of normal Beagle dogs. Most of the absorption occurred in the first few days after administration. The extent of percutaneous absorption of topical medications is determined by many factors including the integrity of the epidermal barrier. Inflammation can increase the percutaneous absorption of veterinary medicinal products.
Pharmaceutical particulars
Lauric acid
Paraffin, Liquid
Plasticised hydrocarbon gel (5% polyethylene in 95% mineral oil)
Major incompatibilities
None known.
Studies with a range of proprietary ear cleaners have shown no chemical incompatibilities.
Shelf life
Shelf life of the veterinary medicinal product as packaged for sale: 2 years
Shelf life after first opening the immediate packaging:
8.8 mL: 7 days
17.5 mL and 35.1 mL: 28 days
Special precautions for storage
This veterinary medicinal product does not require any special storage conditions.
Store in the original bottle and carton.
Immediate packaging
White HDPE bottle with a white LDPE cap, a natural or white LDPE applicator and a sheath.
Pack sizes: 8.8 mL (7.5 g), 17.5 mL (15 g) and 35.1 mL (30 g)
Not all pack sizes may be marketed.
Any unused veterinary medicinal product or waste materials derived from such veterinary medicinal product should be disposed of in accordance with local requirements.
Marketing Authorisation Holder (if different from distributor)
UK(NI): Intervet International B.V., The Netherlands
Marketing Authorisation Number
UK(GB): Vm 01708/5059
UK(NI): EU/2/08/081/001-003
Significant changes
Date of the first authorisation or date of renewal
Date of revision of the text
Any other information
For animal treatment only. Keep out of the sight and reach of children.
Legal category
Legal category: POM-V
GTIN description:Posatex 1x17.5ml:
GTIN description:Posatex 1x35.1ml: