Butador 10 Mg/Ml Solution For Injection For Horses, Dogs And Cats

Revised: October 2015

Amended pages:

Addition of Greek alpha symbol



Butomidor 10 mg/ml solution for injection for horses, dogs and cats (AT, BE, DE, EL, ES, LT, NL, PT, SI)

Torpudorvet 10 mg/ml solution for injection for horses, dogs and cats (FI)

Butomidor vet. 10 mg/ml solution for injection for horses, dogs and cats (SE, NO)

Butador 10 mg/ml solution for injection for horses, dogs and cats (IE, UK)


1 ml contains:

Active substance:

Butorphanol 10 mg

(as butorphanol tartrate 14.58 mg)


Benzethonium chloride 0.1 mg

For the full list of excipients, see section 6.1.


Solution for injection.

Clear, colourless to almost colourless solution.


4.1 Target species

Horse, dog, cat

4.2 Indications for use, specifying the target species


As an analgesic

For the short term relief of pain such as colic of gastrointestinal tract origin.

As a sedative and pre-anaesthetic

In combination with α2-adrenoceptor agonists (detomidine, romifidine, xylazine):

Fortherapeutic and diagnostic procedures such as minor standing surgery and sedation of intractable patients.


As an analgesic

For relief of moderate visceralpain e.g. pre- and post-surgical as well as post-traumatic pain.

As a sedative

In combination with a2-adrenoceptor agonists (medetomidine).

As a pre-anaesthetic

Part of anaesthetic regime (medetomidine, ketamine).

4.3 Contraindications

Do not use in case of hypersensitivity to the active substance or to any of the excipients. Do not use for treatment of animals with severe dysfunction of the liver and kidneys, in case of cerebral injury or organic brain lesions and in animals with obstructive respiratory diseases, heart dysfunctions or spastic conditions.

For combination use with a2-agonists in horses:

Do not use in horses with a pre-existing cardiac dysrhythmia or bradycardia.

The combination will cause a reduction in gastrointestinal motility and consequently should not be used in cases of colic associated with impaction.

Do not use combination during pregnancy.

4.4 Special warnings for each target species

The precautionary measures required for contact with animals should be followed and stress factors for the animals should be avoided.

In cats, individual response to butorphanol may be variable. In the absence of an adequate analgesic response, an alternative analgesic agent should be used.

Increasing of the dose may not increase the intensity or duration of analgesia.

4.5 Special precautions for use

Special precautions for use in animals

The safety of the product in puppies, kitten and foals has not been established. Use of the product in these groups should be on the basis of a risk-benefit analysis by the responsible veterinarian.

Due to its antitussive properties, butorphanol may lead to an accumulation of mucous in the respiratory tract. Therefore, in animals with respiratory diseases associated with increased mucous production, butorphanol should only be used after a risk-benefit evaluation by the responsible veterinarian. If respiratory depression occurs, naloxone may be used as an antidote.

Sedation may be noted in treated animals. The combination of butorphanol and a2-adrenoceptor agonists should be used with caution in animals with cardiovascular disease. The concurrent use of anticholinergic drugs, e.g atropine should be considered.

Administration of butorphanol and romifidine in one syringe should be avoided due to increased bradycardia, heart block and ataxia.


The use of the product at the recommended dose may lead to transient ataxia and/or excitement. Therefore, to prevent injuries in patient and people when treating horses, the location for the treatment should be chosen carefully.


Cats should be weighed to ensure that the correct dose is calculated. An appropriate graduated syringe must be used to allow accurate administration of the required dose volume (e.g. insulin syringe or 1 ml graduated syringe). If repeated administrations are required, use different injection sites.

Special precautions to be taken by the person administering the veterinary medicinal product to animals

Butorphanol has opioid-like activity. Precautions should be taken to avoid accidental injection/self-injection with this potent drug. The most frequent adverse effects of butorphanol in humans are drowsiness, sweating, nausea, dizziness and vertigo and may occur following unintended self-injection. If accidental self-injection occurs, seek medical advice immediately and show the package leaflet or the label to the physician. Do not drive. An opioid antagonist (e.g. naloxone) may be used as an antidote. Wash splashes from skin and eyes immediately.

4.6 Adverse reactions (frequency and seriousness)


Undesirable effects are generally related to the known activity of opioids. In published trials with butorphanol, transient ataxia, lasting about 3 to 15 minutes, occurred in about 20 % of horses. Mild sedation occurred in about 10 % of horses. Increased motor activity (running movements) is possible. Gastrointestinal motility may be reduced.

For combination use:

Any reduction of gastrointestinal motility caused by butorphanol may be enhanced by the concomitant use of a2-agonists. The respiratory depressive effects of a2-agonists may be enhanced by concomitant butorphanol, particularly if respiratory function is already impaired. Other undesirable effects (e.g. cardiovascular) are likely to be related to the a2-agonist.


Depression of the respiratory and cardiovascular system. Local pain associated with intramuscular administration. Decreased gastrointestinal motility. In rare cases, ataxia, anorexia and diarrhoea. In cats excitation or sedation, anxiety, disorientation, dysphoria and mydriasis are possible.

4.7 Use during pregnancy, lactation or lay

Butorphanol crosses the placental barrier and penetrates into milk. Studies in laboratory species have not produced any evidence of teratogenic effects.

The safety of the veterinary medicinal product has not been established in the target species during pregnancy and lactation. The use of butorphanol during pregnancy and lactation is not recommended.

4.8 Interaction with other medicinal products and other forms of interaction

The concomitant administration of other drugs which are metabolised in the liver may enhance the effect of butorphanol.

Butorphanol used with concurrently administered anaesthetics, centrally sedative or respiratory depressive drugs produces additive effects. Any use of butorphanol in this context requires acute control and a careful adaptation of the dose.

Administration of butorphanol may remove the analgesic effect in animals, which have already received pure μ-opioid analgesics.

4.9 Amounts to be administered and administration route

Horse: Intravenous use

Dog: Intravenous, subcutaneous and intramuscular use

Cat: Intravenous and subcutaneous use


As an analgesic


0.1 mg/kg (1 ml/100 kg bw) IV.

As a sedative and as a pre-anaesthetic

With detomidine:

Detomidine: 0.012 mg/kg IV, followed within 5 minutes by

Butorphanol: 0.025 mg/kg (0.25 ml /100 kg bw) IV.

With romifidine:

Romifidine: 0.05 mg/kg IV, followed within 5 minutes by

Butorphanol: 0.02 mg/kg (0.2 ml /100 kg bw) IV.

With xylazine:

Xylazine: 0.5 mg/kg IV, followed after 3 - 5 minutes by

Butorphanol: 0.05 – 0.1 mg/kg (0.5 - 1 ml /100 kg bw) IV.


As an analgesic


0.1 - 0.4 mg/kg (0.01 – 0.04 ml/kg bw) slowly IV (in the lower to medium dose range) as well as IM, SC.

For post-operative pain control the injection should be administered 15 minutes before the end of anaesthesia in order to achieve sufficient pain relief during the recovery phase.

As a sedative

With medetomidine:

Butorphanol: 0.1 mg/kg (0.01 ml/kg bw) IV, IM

Medetomidine: 0.01 mg/kg IV, IM.

As a pre-anaesthetic

With medetomidine and ketamine:

Butorphanol: 0.1 mg/kg (0.01 ml/kg bw) IM

Medetomidine: 0.025 mg/kg IM, followed after 15 minutes by

Ketamine: 5 mg/kg IM.

It is only possible to use atipamezole 0.1 mg/kg body weight for medetomidine-antagonisation when ketamine action has ceased.


As an analgesic


15 minutes prior to recovery

either: 0.4 mg/kg (0.04 ml/kg bw) SC

or: 0.1 mg/kg (0.01 ml/kg bw) IV

As a sedative

With medetomidine:

Butorphanol: 0.4 mg/kg (0.04 ml/ kg bw) SC

Medetomidine: 0.05 mg/kg SC.

For wound debridement an additional local anaesthesia is recommended.

Medetomidine-antagonisation is possible with atipamezole 0.125 mg/kg body weight.

As a pre-anaesthetic

With medetomidine and ketamine:

Butorphanol: 0.1 mg/kg (0.01 ml/ kg bw) IV

Medetomidine: 0.04 mg/kg IV

Ketamine: 1.5 mg/kg IV.

It is only possible to use atipamezole 0.1 mg/kg body weight for medetomidine–antagonisation when ketamine action has ceased.

Butorphanol is intended for use where short (horse and dog) and short to medium (cat) analgesia is required. The dose may be repeated as required. The need for and timing of repeated treatment will be based on clinical response. For information on the duration of analgesia see section 5.1.

Rapid intravenous injection should be avoided.

4.10 Overdose (symptoms, emergency procedures, antidotes), if necessary


Increased dosages could result in respiratory depression as a general opioid effect. Intravenous doses of 1.0 mg/kg (10 x the recommended dose), repeated at 4-hourly intervals for 2 days, led to transient adverse effects, including pyrexia, tachypnoea, CNS signs (hyperexcitability, restlessness, mild ataxia leading to somnolence) and gastrointestinal hypomotility, sometimes with abdominal discomfort. An opioid antagonist (e.g. Naloxone) may be used as an antidote.


Miosis (dog)/Mydriasis (cat), respiratory depression, hypotension, disorders of the cardiovascular system and in severe cases respiratory inhibition, shock and coma. Depending on the clinical situation counter-measures should be taken under intense medical monitoring. Monitoring is required for a minimum of 24 hours.

4.11 Withdrawal period(s)


Meat and offal: zero days

Milk: zero hours


Pharmacotherapeutic group: Morphinan derivatives;

ATCvet code: QN02AF01

5.1 Pharmacodynamic properties

Butorphanol is a centrally acting analgesic from the group of synthetic opioids with an agonistic-antagonistic effect, agonist at the kappa opioid receptor subtype and antagonist at the mu receptor subtype. The kappa receptors control analgesia, sedation without depression of cardiopulmonary system and body temperature, whereas the mu receptors control supraspinal analgesia, sedation and depression of cardiopulmonary system and body temperature.

The agonist component of butorphanol activity is ten times more potent than the antagonist component.

Analgesia generally occurs within 15 minutes following administration in horse, dog and cat. After a single intravenous dose in the horse analgesia usually lasts up to 2 hours. In the dog it lasts up to 30 minutes after a single intravenous administration. In cats with visceral pain analgesic effects have been demonstrated for up to 6 hours. In cats with somatic pain duration of analgesia has been considerably shorter.

Increased doses do not correlate with increased analgesia, a dosage of about 0.4 mg/kg leads to a ceiling effect.

Butorphanol has minimal cardiopulmonary depressant activity in the target species. It does not cause histamine release in horses. In combination with a2-agonists it causes additive and synergistic sedation.

5.2 Pharmacokinetic particulars

Post parenteral administration absorption of the product is rapid and almost complete with serum peak levels occurring after 0.5 - 1.5 hours. It is highly bound to plasma proteins (up to 80 %). Volume of distribution is large after IV administration (2.1 l/kg for horses, 4.4 l/kg for dogs and 7.4 l/kg for cats) suggesting wide distribution into tissues.

Metabolism is rapid and mainly occurs in the liver. Two inactive metabolites are produced. Terminal half life is short: about 44 minutes in the horse, 1.7 hours for dogs and 4.1 hours for cats.

The elimination occurs mainly through urine (to a major extent) and faeces. 97 % of the dose after IV administration in the horse will be eliminated in less than 5 hours.


6.1 List of excipients

- Benzethonium chloride

- Sodium chloride

- Water for injection

6.2 Incompatibilities

In the absence of compatibility studies, this veterinary medicinal product must not be mixed with other veterinary medicinal products.

6.3 Shelf life

Shelf-life of the veterinary medicinal product as packaged for sale: 3 years

Shelf-life after first opening the immediate packaging: 28 days

6.4. Special precautions for storage

This veterinary medicinal product does not require any special temperature storage conditions.

Keep the vial in the outer carton in order to protect from light.

6.5 Nature and composition of immediate packaging

Clear glass vials with bromobutyl rubber stoppers and aluminium caps.

Package sizes: 1 x 10 ml, 5 x 10 ml, 10 x 10 ml, 1 x 50 ml.

Not all pack sizes may be marketed.

6.6 Special precautions for the disposal of unused veterinary medicinal product or waste materials derived from the use of such products

Any unused veterinary medicinal product or waste materials derived from such veterinary medicinal product should be disposed of in accordance with local requirements.


Richter Pharma AG

Feldgasse 19

4600 Wels





17 January 2011


October 2015

Approved: 27 October 2015

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