1. Name Of The Medicinal Product
Tramadol 50mg/ml Solution for Injection or Infusion.
2. Qualitative And Quantitative Composition
Each ampoule contains 100mg tramadol hydrochloride in 2ml solution (50mg/ml).
For a full list of excipients see Section 6.1.
3. Pharmaceutical Form
Solution for Injection or Infusion
A clear colourless solution in glass ampoules.
4. Clinical Particulars
4.1 Therapeutic Indications
For the treatment and prevention of moderate to severe pain.
4.2 Posology And Method Of Administration
As with all analgesic drugs, the dose of tramadol should be adjusted according to the severity of pain and the clinical response of the patient. The tramadol solution is for parenteral injection either intramuscularly, by slow intravenous injection or diluted in solution (see Section 6.6 Special instructions for use and handling) for administration by infusion or patient controlled analgesia.
Adults and children 12 years and over:
The usual dose is 50mg or 100mg 4 to 6 hourly by either intramuscular or intravenous routes. Intravenous injections must be given slowly over 2–3 minutes. The dose should be adjusted according to the severity of the pain and the response.
For post-operative pain, an initial bolus of 100mg is administered. During the 60 minutes following the initial bolus, further doses of 50mg may be given every 10-20 minutes, up to a total dose of 250mg including the initial bolus. Subsequent doses should be 50mg or 100mg 4-6 hourly up to a total daily dose of 600mg.
Elderly:
The usual dosages may be used. However, it is reported that in volunteers aged over 75 years, the elimination half-life of tramadol was increased by 17% following oral administration.
Renal impairment/renal dialysis:
The elimination of tramadol may be prolonged. The usual adult dosage may be used but the dosage interval should be adjusted. For patients with creatinine clearance <30ml/min, the dosage interval should be increased to 12 hours. For patients with severe renal impairment (creatinine clearance of <10ml/min) tramadol is not recommended. As tramadol is only removed slowly by haemodialysis or haemofiltration, post-dialysis administration to maintain analgesia is not usually necessary.
Hepatic impairment:
The elimination of tramadol may be prolonged by hepatic impairment. The usual initial dosage should be used but, in cases of severe hepatic impairment, the dosage interval should be increased to 12 hours.
Children under 12 years:
Not recommended.
4.3 Contraindications
Tramadol 50mg/ml Solution for Injection should not be given to patients who have previously demonstrated hypersensitivity towards tramadol or any of the other ingredients (see Section 6.1 for 'list of excipients'). Tramadol 50mg/ml Solution for injection should not be given to patients suffering from acute intoxication with alcohol, hypnotics, centrally acting analgesics, opioids or psychotropic drugs.
In common with other opioid analgesics, tramadol should not be administered to patients who are receiving monoamine oxidase inhibitors or within two weeks of their withdrawal (see section 4.5 'Interaction with other medicinal products and other forms of interaction').
4.4 Special Warnings And Precautions For Use
Warnings
At therapeutic doses, tramadol has the potential to cause withdrawal symptoms. Rarely, cases of dependence and abuse have been reported.
At therapeutic doses withdrawal symptoms have been reported at a frequency of 1 in 8,000. Reports of dependence and abuse have been less frequent. Because of this potential the clinical need for continued analgesic treatment should be reviewed regularly.
In patients with a tendency to drug abuse or dependence, treatment should be for short periods and under strict medical supervision.
Tramadol 50mg/ml Solution for Injection is not a suitable substitute in opioid dependent patients. The product does not suppress morphine withdrawal symptoms although it is an opioid agonist.
Tramadol 50mg/ml Solution for Injection may cause drowsiness and this effect may be potentiated by alcohol and other CNS depressants. Ambulant patients should be warned not to drive or operate machinery if affected (see section 4.7 Effects on the ability to drive and use machines)
Precautions
Tramadol 50mg/ml Solution for Injection should be used with caution in patients with head injury, increased intracranial pressure, severe impairment of hepatic and renal function and in patients prone to convulsive disorders or in shock.
Convulsions have been reported at therapeutic doses and the risk may be increased at doses exceeding the usual upper daily dose limit. Patients with a history of epilepsy or those susceptible to seizures should only be treated with tramadol if there are compelling reasons. The risk of convulsions may increase in patients taking tramadol and concomitant medication that can lower the seizure threshold (see section 4.5 'Interactions with other Medicinal Products and other Forms of Interactions').
Care should be taken when treating patients with respiratory depression, or if concomitant CNS depressant drugs are being administered, as the possibility of respiratory depression cannot be excluded in these situations. At therapeutic doses respiratory depression has infrequently been reported. In one study using a nitrous oxide/opioid (tramadol) anaesthetic technique (with only intermittent administration of enflurane 'as required') tramadol was reported to enhance intra-operative recall. Hence its use during potentially very light planes of general anaesthesia should be avoided.
Two studies of tramadol administration during anaesthesia comprising continuous administration of isoflurane have shown clinically significant lightening of anaesthetic depth or intra-operative recall. Therefore providing the current practice of administering continuous, potent (volatile or intravenous) anaesthetic agent is followed, tramadol may be used intra-operatively in the same way as other analgesic agents are routinely used.
This medicinal product contains approximately 8.29mg sodium acetate trihydrate (1.4mg sodium) per 2ml dose.
4.5 Interaction With Other Medicinal Products And Other Forms Of Interaction
Tramadol 50mg/ml Solution for Injection should not be combined with MAO inhibitors (see Section 4.3 'Contraindications').
Concomitant administration of Tramadol 50mg/ml Solution for Injection with other centrally acting drugs, including alcohol, may potentiate CNS depressant effects (see Section 4.8 'Undesirable Effects').
Tramadol may increase the potential for both selective serotonin reuptake inhibitors (SSRIs) and tricyclic antidepressants (TCAs) to cause convulsions (see Section 4.4 'Special Warnings and Precautions for Use' and 5.2 'Pharmacokinetic Properties').
Theoretically there is a possibility that tramadol could interact with lithium. There have been no reports of this potential interaction.
Serotonergic drugs: Co-administration with serotonergic drugs, e.g. SSRIs or triptans, may lead to an increase of serotonin-associated effects, which can include serotonin syndrome.
There have been isolated reports of interaction with coumarin anticoagulants resulting in an increased INR and so care should be taken when commencing treatment with tramadol in patients on anticoagulants.
Pharmacokinetic studies were conducted to investigate the effects of cimetidine, quinidine and carbamazepine on the pharmacokinetics of tramadol.
Carbamazepine - The simultaneous administration of carbamazepine markedly decreases serum concentrations of tramadol to an extent that a decrease in analgesic effectiveness and a shorter duration of action may occur.
Cimetidine - With the concomitant or previous administration of cimetidine clinically relevant interactions are unlikely to occur. Therefore no alteration of the tramadol dosage regimen is recommended for patients receiving chronic cimetidine therapy.
Quinidine - A study in 12 healthy volunteers has shown that quinidine causes an approximate 25% increase in the tramadol Cmax and AUC; Tmax is unaffected. However, the increases in Cmax and AUC fall within the normal therapeutic range for tramadol, and no dosage adjustment is required.
4.6 Pregnancy And Lactation
Pregnancy
Animal studies with tramadol at very high doses have revealed effects on organ development, ossification and neonatal mortality. Tramadol crosses the placenta. There is inadequate evidence available on the safety of tramadol in human pregnancy, therefore Tramadol 50mg/ml Solution for Injection should not be used in pregnant women.
Lactation
Tramadol and its metabolites are found in small amounts in human breast milk. An infant could ingest 0.1% of the dose given to the mother. Tramadol 50mg/ml Solution for Injection should not be administered during breast-feeding.
4.7 Effects On Ability To Drive And Use Machines
Tramadol 50mg/ml Solution for Injection may cause drowsiness and this effect may be potentiated by alcohol and other CNS depressants. Ambulant patients should be warned not to drive or operate machinery if affected.
4.8 Undesirable Effects
Rapid intravenous administration may be associated with a higher incidence of adverse effects and therefore should be avoided. The most commonly reported adverse drug reactions are nausea and dizziness, both occurring in more than 10 % of patients.
Cardiovascular system disorders: Uncommon (< 1 %) cardiovascular regulation (palpitation, tachycardia, postural hypotension or cardiovascular collapse). These adverse effects may occur especially after intravenous administration and in patients who are physically stressed. Rarely (< 0.1%) bradycardia, increase in blood pressure.
Central and peripheral nervous system disorders: Common (1-10 %) headache, muzziness. Rarely (< 0.1 %) changes in appetite, paraesthesia, tremor, respiratory depression, epileptiform convulsions.
Psychiatric disorders: Rarely (< 0.1 %) hallucinations, confusion, sleep disturbance and nightmares. Psychic side effects may occur following administration of tramadol, which vary individually in intensity and nature (depending on personality and duration of medication). These include changes in mood (usually elation, occasionally dysphoria), changes in activity (usually suppression, occasionally increase) and changes in cognitive and sensorial ability (e.g. decision behaviour, perception disorders). Dependence may occur.
Vision disorders: Rarely (< 0.1%) blurred vision
Respiratory system disorders: Worsening of asthma has been reported, though a causal relationship has not been established.
Gastrointestinal disorders: Very common (>10 %) nausea. Common (1-10%): vomiting, constipation, diarrhoea, dry mouth. Uncommon (< 1 %): retching, gastrointestinal irritation (a feeling of pressure in the stomach, bloating).
Skin and appendages disorders: Common (1-10 %) sweating. Uncommon (< 1 %) dermal reactions (e.g. pruritus, rash, urticaria).
Musculo-Skeletal system disorders: Rarely (< 0.1%) muscle weakness.
Liver and biliary system disorders: In rare cases, increases in liver enzyme values have been reported in a temporal connection with the therapeutic use of tramadol.
Urinary system disorders: Rarely (< 0.1 %) micturition disorders (difficulty in passing urine and urinary retention)
Body as a whole: Rarely (< 0.1 %) allergic reactions (e.g. dyspnoea, bronchospasm, wheezing, angioneurotic oedema) and anaphylaxis. Symptoms of withdrawal reactions, similar to those occurring during opiate withdrawal, may occur as follows: agitation, anxiety, nervousness, insomnia, hyperkinesia, tremor and gastrointestinal symptoms.
4.9 Overdose
Symptoms of overdosage are typical of other opioid analgesics, and include miosis, vomiting, cardiovascular collapse, sedation and coma, seizures and respiratory depression.
Supportive measures such as maintaining the patency of the airway and maintaining cardiovascular function should be instituted; naloxone should be used to reverse respiratory depression; fits can be controlled with diazepam.
Tramadol is minimally eliminated from the serum by haemodialysis or haemofiltration. Therefore treatment of acute tramadol intoxication with haemodialysis or haemofiltration alone is not suitable for detoxification.
5. Pharmacological Properties
5.1 Pharmacodynamic Properties
ATC code N 02A X02: Analgesics – other opioids
Tramadol 50mg/ml Solution for Injection is a centrally acting analgesic. It is a non-selective pure agonist at mu, delta and kappa opioid receptors with a higher affinity for the mu receptor. Other mechanisms, which may contribute to its analgesic effect, are inhibition of neuronal reuptake of noradrenaline and enhancement of serotonin release.
5.2 Pharmacokinetic Properties
After oral administration, tramadol is almost completely absorbed. Mean absolute bioavailability is approximately 70% following a single dose and increases to approximately 90% at steady state. Plasma protein binding of tramadol is approximately 20%. When 14C-labelled tramadol was administered to humans, approximately 90% was excreted via the kidneys with the remaining 10% appearing in the faeces.
Tramadol has a linear pharmacokinetic profile within the therapeutic dosage range. The half-life of the terminal elimination phase (t½β) was 6.0 + 1.5h in young volunteers. Tramadol pharmacokinetics show little age dependence in volunteers up to the age of 75 years. In volunteers aged over 75 years, t½β was 7.0 + 1.6h on oral administration.
Tramadol is metabolised by the cytochrome P450 isoenzyme CYP2D6. It undergoes biotransformation to a number of metabolites mainly by means of N- and O-demethylation. O-desmethyl tramadol appears to be the most pharmacologically active metabolite, showing analgesic activity in rodents. As humans excrete a higher percentage of unchanged tramadol than animals it is believed that the contribution made by this metabolite to analgesic activity is likely to be less in humans than animals. In humans the plasma concentration of this metabolite is about 25% that of unchanged tramadol.
Since tramadol is eliminated both metabolically and renally, the terminal half-life t½β may be prolonged in impaired hepatic or renal function. In patients with liver cirrhosis t½β tramadol was a mean of 13.3 + 4.9h; in patients with renal insufficiency (creatinine clearance < 5 ml/min) it was 11.0 + 3.2h.
The inhibition of one or both cytochrome P450 isoenzymes, CYP3A4 and CYP 2D6, involved in the metabolism of tramadol may affect the plasma concentrations of tramadol or its active metabolite. The clinical consequences of any such interactions are unknown.
5.3 Preclinical Safety Data
In single and repeat-dose toxicity studies (rodents and dogs) exposure to tramadol 10 times that expected in man is required before toxicity (hepatotoxicity) is observed.
Symptoms of toxicity are typical of opioids and include restlessness, ataxia, vomiting, tremor, dyspnoea and convulsions. Exposure to tramadol (
6. Pharmaceutical Particulars
6.1 List Of Excipients
Sodium acetate trihydrate. Water for injections
6.2 Incompatibilities
Precipitation will occur if Tramadol 50mg/ml Solution for Injection is mixed in the same syringe with injections of diazepam, diclofenac sodium, indometacin, midazolam and piroxicam.
Tramadol 50mg/ml Solution for Injection must not be mixed with other medicinal products except those mentioned in section 6.6.
6.3 Shelf Life
3 years. From a microbiological point of view, the product should be used immediately. If not used immediately, in-use storage times and conditions prior to use are the responsibility of the user and would not normally be longer than 24 hours at 2 to 8°C, unless reconstitution / dilution has taken place in controlled and validated aseptic conditions.
6.4 Special Precautions For Storage
Keep ampoule in the outer carton.
6.5 Nature And Contents Of Container
2ml neutral glass type I glass ampoules. Box of 5 ampoules.
6.6 Special Precautions For Disposal And Other Handling
The prepared infusion solution should be made up immediately before use. Tramadol 50mg/ml Solution for Injection is physically and chemically compatible for up to 24 hours with 4.2% sodium bicarbonate and Ringer's solution.
Or up to 5 days with the following infusion solutions: 0.9% sodium chloride; 0.18% sodium chloride and 4% glucose; sodium lactate compound; or 5% glucose.
ADMINISTRATIVE DATA
7. Marketing Authorisation Holder
Beacon Pharmaceuticals Ltd., Tunbridge Wells, TN1 1YG, UK
8. Marketing Authorisation Number(S)
PL 18157/0014
9. Date Of First Authorisation/Renewal Of The Authorisation
August 2007
10. Date Of Revision Of The Text