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Clinical particulars
Target species
Dogs (male).
Indications for use
For the induction of temporary infertility in healthy, entire, sexually mature male dogs for up to at least 6 months. Insert one implant per dog, irrespective of size.
Contra-indications
None
Special warnings for each target species
Infertility is achieved from 6 weeks up to at least 6 months after initial treatment. Treated dogs should therefore still be kept away from bitches on heat within the first six weeks after initial treatment.
One out of 75 dogs treated with the product during clinical trials mated and tied with a bitch on heat within six months of implantation, but this did not result in pregnancy. Should a treated dog mate with a bitch between six weeks and six months after treatment, appropriate measures should be taken to rule out the risk of pregnancy.
Any mating that occurs more than six months after the administration of the product may result in pregnancy. However, it is not necessary to keep bitches away from treated dogs following subsequent implantations, provided that the product is administered every six months.
The ability of dogs to sire offspring following their return to normal plasma testosterone levels, after the administration of the product, has not been investigated.
With respect to testosterone levels (an established surrogate marker of fertility), during clinical trials more than 80 % of dogs administered one or more implants, returned to normal plasma testosterone levels (≥0.4 ng/ml) within 12 months of implantation. Ninety-eight percent of dogs returned to normalplasma testosterone levels within 18 months of implantation. However, data demonstrating the complete reversibility of clinical effects (reduced testicular size, reduced ejaculation volume, reduced sperm count and reduced libido) including fertility after six months, or repeated implantation, are limited.
During clinical trials, most of the smaller size dogs (<10 kg) maintained suppressed levels of testosterone for more than 12 months following implantation. For very large dogs (>40 kg), data are limited but duration of testosterone suppression was comparable to that seen in medium and large dogs. The use of the product in dogs of less than 10 kg or more than 40 kg bodyweight, therefore, should be subject to a risk/benefit assessment performed by the veterinarian.
Surgical or medical castration might have unexpected consequences (i.e. improvement or worsening) on aggressive behaviour. Thus, dogs with sociopathic disorders and showing episodes of intra-specific (dog to dog) and/or inter-specific (dog to another species) aggressions should not be castrated either surgically or with the implant.
Special precautions for use
Special precautions for use in animals
The use of the product in pre-pubertal dogs has not been investigated. It is therefore recommended that dogs should be allowed to reach puberty before treatment with the product is initiated.
Data demonstrate that treatment with the product will reduce the libido of the dog, but other behavioural changes (e.g. male-associated aggression) have not been investigated.
Special precautions to be taken by the person administering the veterinary medicinal product to animals
Pregnant women should not administer the product. Another GnRH analogue has been shown to be foetotoxic in laboratory animals. Specific studies to evaluate the effect of deslorelin when administered during pregnancy have not been conducted.
Although skin contact with the product is unlikely, should this occur, wash the exposed area immediately, as GnRH analogues may be absorbed through the skin.
When administering the product, take care to avoid accidental self-injection by ensuring that animals are suitably restrained and the application needle is shielded until the moment of implantation.
In case of accidental self-injection, seek medical advice immediately, with a view to having the implant removed. Show the package leaflet or the label to the physician.
Adverse reactions
Moderate swelling at the implant site may be observed for 14 days. Histologically, mild local reactions with chronic inflammation of the connective tissue and some capsule formation and collagen deposition have been seen at 3 months after administration.
A significant decrease in testicle size will be seen during the treatment period. In very rare cases, a testicle may be able to ascend the inguinal ring.
In very rare cases (<0.01%) there has been transitory increased sexual interest, increased testicle size and testicular pain immediately after implantation. These signs resolved without treatment.
During the treatment period, rare clinical effects (> 0.01% to < 0.1%) have been reported: hair coat disorders (e.g. hair loss, alopecia, hair modification), urinary incontinence, down-regulation associated signs (e.g. decrease in testicle size, reduced activity).
In very rare cases (<0.01%), a transient behavioural change has been reported with the development of aggression (see section on "Special Warnings for Each Target Species").
Use during pregnancy, lactation or lay
Not applicable
Interactions
None known
Amounts to be administered and administration route
Subcutaneous use.
The recommended dose is one implant per dog, irrespective of the size of the dog.
Disinfection of the implantation site should be undertaken prior to implantation to avoid introduction of infection. If the hair is long, a small area should be clipped, if required.
Remove Luer Lock cap from the implanter. Attach the actuator to the implanter using the Luer Lock connection.
The product should be implanted subcutaneously in the loose skin on the back between the lower neck and the lumbar area. Avoid injection of the implant into fat, as release of the active substance might be impaired in areas of low vascularisation. Lift the loose skin between the shoulder blades. Insert the entire length of the needle subcutaneously. Fully depress the actuator plunger and, at the same time, slowly withdraw the needle. Press the skin at the insertion site as the needle is withdrawn, and maintain pressure for 30 seconds. Examine the syringe and needle to ascertain that the implant has not remained within the syringe or needle, and that the spacer is visible. It may be possible to palpate the implant in situ.
Repeat administration every six months to maintain efficacy.
Do not use the product if the foil pouch is broken.
The biocompatible implant does not require removal. However, should it be necessary to end treatment, implants may be surgically removed by a veterinarian. Implants may be located using ultrasound.
Overdose
No adverse reactions have been observed following simultaneous subcutaneous administration of up to 10 implants.
Withdrawal periods
Not applicable