Chanazone 1g Oral Powder for Horses 5g sachet (pack of 100)

Target species Horses (non-food producing horses). 4.2 Indications for use, specifying the target species The product is indicated for the treatment of musculoskeletal conditions in the horse where relief from pain and a reduction in the associated inflammation is required, e.g. in lameness associated with osteoarthritic conditions, bursitis, laminitis and soft tissue inflammation, particularly where continued mobility is considered desirable. It is also of value in limiting post surgical inflammation, myositis and other soft tissue inflammation. Phenylbutazone powder can be used as an anti-pyretic where this is considered advisable e.g. in viral respiratory infections. 4.3 Contraindications Do not use in cases of known hypersensitivity to the active substance or to any of the excipients Do not use in animals suffering from cardiac, hepatic or renal disease, where there is the possibility of gastro-intestinal ulceration or bleeding or where there is evidence of a blood dyscrasia. Do not use in animals suffering from thyroid disease. Do not use in animals with severe hypertonia. Do not use in animals with lesions in the intestinal mucosa, caused by parasitic infestations. 4.4 Special warnings for each target species The clinical effects of phenylbutazone can be evident for at least three days following cessation of therapy. This should be borne in mind when examining horses for soundness. The International Federation for Equestrian Sports (FEI) regards phenylbutazone as prohibited substance in the context of a participation of the treated horse in equestrian sport events. A horse, which is or has recently been under treatment with the product, might not be allowed to participate in sport events. Please refer to recommendations of the FEI, national laws and national association rules for withdrawal times prior to competition. 4.5 Special precautions for use Special precautions for use in animals Do not exceed the stated dose of 8.8 mg/kg/day as the therapeutic index of phenylbutazone is low. Use in any animal less than 6 weeks of age or in aged animals may involve additional risk. If such use cannot be avoided animals require careful clinical management. Avoid use in any dehydrated, hypovolaemic or hypotensive animal as there is a potential risk of increased renal toxicity. Keep water readily available during the treatment period to avoid dehydration. NSAIDs can cause inhibition of phagocytosis and hence in the treatment of inflammatory conditions associated with bacterial infections, appropriate concurrent antimicrobial therapy should be considered. Special precautions to be taken by the person administering the veterinary medicinal product to animals This product may cause hypersensitivity (allergic) reactions in those sensitized to phenylbutazone, either via skin contact or accidental inhalation. People with known hypersensitivity to phenylbutazone, or any of the excipients, should avoid contact with this product. If you develop symptoms following exposure, such as skin rash, you should seek medical advice and show the doctor this warning. Swelling of the face, lips or eyes, or difficulty breathing, are more serious symptoms and require urgent medical attention. This product can be irritating to the skin and the eyes. Avoid contact with the eyes. In case of accidental eye contact, irrigate eyes with plenty of clean water. If irritation persists seek medical advice. Care should be taken to avoid inhaling or ingesting the powder. In the event of accidental inhaling or ingestion, seek medical advice and show the product packaging to the physician. Wash any exposed skin and hands after use. 4.6 Adverse reactions (frequency and seriousness) In common with other NSAIDs that inhibit prostaglandin synthesis, there may be gastric and/or renal intolerance. This is usually associated with overdosage and such events are rare (more than 1 but less than 10 animals in 10,000 animals treated). Recovery is usual on cessation of treatment and following the initiation of supportive symptomatic therapy (see 4.10 for further information). Blood dyscrasia may occur. Ponies are very sensitive to gastric ulceration with this product, even at therapeutic doses (diarrhoea, ulceration in the mouth and hypoproteinaemia may also be seen). If adverse reactions occur, treatment should be discontinued and the advice of a veterinarian should be sought. 4.7 Use during pregnancy, lactation or lay Care should be exercised if administered to pregnant mares. Although no adverse effects of phenylbutazone on the foetus or maintenance of pregnancy have been reported during field use, no definitive safety studies have been carried out in the mare. Foetotoxic effects of phenylbutazone have been recorded in experimental animal species at high dose levels. Use phenylbutazone in pregnant and lactating mares only according to a benefit/risk assessment by the responsible veterinarian. Avoid use around time of parturition. 4.8 Interaction with other medicinal products and other forms of interaction Do not administer other NSAIDs concurrently or within 24 hours of each other. Concurrent administration of potential nephrotoxic drugs should be avoided. Phenylbutazone induces hepatic microsomal enzyme activity. There is a potential risk of increased renal toxicity after concurrent administration of aminoglycosides. Concomitant use of glucocorticoids, other NSAIDs or anticoagulants increase adverse effects of phenylbutazone. Therapeutic efficacy of diuretics may be reduced when used in combination with phenylbutazone-containing products Phenylbutazone is extensively bound to plasma proteins. It may displace other drugs that are highly protein bound, e.g. some sulphonomides, warfarin or it may itself be displaced to produce an increase in non-bound pharmacologically active concentrations, which can lead to toxic effects. Concurrent therapy with other therapeutic agents should be undertaken with caution due to the risk of metabolic interactions. Phenylbutazone may interfere with the metabolism of other drugs, e.g. warfarin, barbiturates with resultant toxicity. There is evidence to indicate that the pharmacokinetics of penicillin and gentamicin products may be affected by concurrent administration of products containing phenylbutazone, with a possible reduction of therapeutic efficacy, since tissue penetration may be reduced. The distribution in other drugs given concurrently may also be affected.
Vat Rate: 20%