Clear, sterile injectable solution. Each ml contains 0.315 mg fentanyl citrate Ph Eur (equivalent to 0.2 mg fentanyl base) and 10 mg fluanisone BP (Vet). Each ml also contains 0.5mg methyl parahydroxybenzoate Ph Eur and 0.05mg propyl parahydroxybenzoate Ph Eur as preservatives.