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POM-V Prescription Required

Torphasol 10 mg/ml Solution for Injection for Horses

Active ingredient: Butorphanol

Form

Injection

Species

Horses

Manufacturer

aniMedica GmbH

VMD MA No.

24745/4009

What it's used for

For sedation in combination with certain α2-adrenoceptor agonists.

Full indications, dosage and side effects ↓
View official SPC (PDF)

The prescription itself has a price. See what practices near you charge for a consultation and the written prescription fee.

Paying less for Butorphanol

  1. 1

    Ask your vet for a written prescription

    They must provide one on request. Under the CMA Order the fee is capped at £21 from 2027.

  2. 2

    Fill it at a registered online retailer

    The CMA found online pharmacies 50–60% cheaper than practice dispensing on common medicines — typically £200–£300 a year.

Prescription required

Your vet must provide a written prescription on request. You can then purchase from any licensed online retailer.

Clinical information

Torphasol 10 mg/ml Solution for Injection for Horses — SPC Details

Source: VMD Summary of Product Characteristics (SPC). Last updated 27 Mar 2026.

For sedation in combination with certain α2-adrenoceptor agonists.
Analgesia:
Dose rate: 100 butorphanol per kg bodyweight (BW) (equivalent to 1 ml for 100 kg
BW), by intravenous injection. Butorphanol is intended for use where short duration
analgesia is required. The dose may be repeated as required. The need for and
timing of repeat treatment will be based on clinical response. For cases where longer
duration analgesia is likely to be required, an alternative therapeutic agent should be
used.
Sedation in combination with detomidine hydrochloride:
A dose rate of 12 μg detomidine hydrochloride per kg BW should be given
intravenously followed within 5 minutes by a dose rate of 25 μg butorphanol per kg
BW (equivalent to 0.25 ml for 100 kg BW) intravenously.
Sedation in combination with romifidine:
A dose of 40-120 μg romifidine per kg BW followed within 5 minutes by a dose rate of
20 μg
administered intravenously.
Sedation in combination with xylazine:
A dose rate of 500 μg
μg butorphanol per kg BW (equivalent to 0.25-0.5 ml per 100 kg) should be
administered intravenously.
Butorphanol – as a sole agent and in any combination:
Do not use in horses with a history of liver or kidney disease.
AN: 03314/2024 & 03318/2024
Do not use in cases of hypersensitivity to the active substance or to any of the
excipients.
Do not use in cases of cerebral injury or organic brain lesions (e.g. lesions
following cranial trauma) and in animals with obstructive respiratory diseases,
heart dysfunction or spastic convulsions.
Butorphanol / detomidine hydrochloride combination:
The combination should not be used in pregnant animals.
Do not use the combination in horses with a pre-existing cardiac dysrhythmia or
bradycardia.
Do not use in horses with emphysema due to a possible depressive effect in the
respiratory system.
Butorphanol / romifidine combination:
Do not use during the last month of pregnancy.
Butorphanol / xylazine combination:
The combination should not be used in pregnant animals.
Any reduction in gastrointestinal motility caused by butorphanol may be enhanced by
the concomitant use of agonists. Consequently, such combinations
should not be used in cases of colic associated with impaction.
Horses:
Undetermined frequency
(cannot be estimated from the
available data):
Ataxia
Sedation
Pacing
Digestive tract hypomotility
Cardiac depression
Mild and may occur following the administration of butorphanol as a sole agent
Excitatory locomotor effects.
Reporting adverse events is important. It allows continuous safety monitoring of a
veterinary medicinal product. Reports should be sent, preferably via a veterinarian, to
either the marketing authorisation holder or its local representative or the national
competent authority via the national reporting system. See the package leaflet for
respective contact details.
None.

Special precautions for safe use in the target species:
Safety and efficacy of butorphanol in foals have not been established. In foals, use
the veterinary medicinal product only according to the benefit/risk assessment 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 or in animals that are being treated with
expectorants, butorphanol should only be used on the basis of a risk-benefit analysis
by the responsible veterinarian.
The use of the veterinary medicinal product at the recommended dose may lead to
transient ataxia and/or excitement. Therefore, to prevent injuries in patient and
people, the location for the treatment should be chosen carefully.
Butorphanol / detomidine hydrochloride combination:
Routine cardiac auscultation should be performed prior to use in combination with
detomidine.
AN: 03314/2024 & 03318/2024
Special precautions to be taken by the person administering the veterinary medicinal
product to animals:
Direct contact with skin or eye of the user should be avoided since the veterinary
medicinal product might induce irritation and sensitization. Accidental spillage on the
skin should be washed immediately with soap and water. When the veterinary
medicinal product comes into contact with the eyes, rinse immediately with plenty of
water.
Care should be taken when handling the veterinary medicinal product to avoid self-
injection. In case of accidental self-injection, seek medical advice immediately and
show the package leaflet or the label to the physician, and DO NOT DRIVE, since
drowsiness, nausea and dizziness may occur. Effects can be reversed by the
administration of an opioid antagonist.
Special precautions for the protection of the environment:
Not applicable.
Butorphanol may be used in combination with other sedatives such as
adrenoceptor agonists (e.g. romifidine, detomidine, xylazine) where synergistic
effects can be expected. Therefore, an appropriate reduction in dose is necessary
when used concomitantly with such agents.
AN: 03314/2024 & 03318/2024
Because of its antagonist properties at the opiate mu receptor, butorphanol may
inhibit the analgesic effect in animals, which have already received pure opioid mu
agonists (morphine/oxymorphine).
Because of the antitussive properties of butorphanol, it should not be used in
combination with an expectorant, as this may lead to an accumulation of mucous in
the airways.
The combination of butorphanol and α2-adrenoceptor agonists should be used with
caution in animals with cardiovascular disease. The concurrent use of anticholinergic
drugs, e.g. atropine should be considered.
Keep the vial in the outer carton in order to protect from light.
AN: 03314/2024 & 03318/2024
Meat and offal: zero days.
AN: 03314/2024 & 03318/2024
Milk: zero days.

This information is sourced from the official Summary of Product Characteristics (SPC) published by the Veterinary Medicines Directorate (VMD). It is provided for informational purposes only and does not replace professional veterinary advice. Always consult your vet before administering any medication.

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