Prostin

Prostin E2 Sterile Solution 10 mg/ml.

Each ml contains 10 mg dinoprostone (5 mg per ampoule).

Following dilution in accordance with instructions, each ml of the resultant solution for infusion contains 5 micrograms dinoprostone.

Excipient(s) with known effect

Each 0.5 ml ampoule contains 332 mg dehydrated alcohol (ethanol).

Concentrate for solution for infusion (sterile concentrate).

The concentrate is a clear, colourless, alcoholic solution free from particulate matter, for intravenous administration after appropriate dilution.

Oxytocic agent. Prostin E2 Sterile Solution 10 mg/ml is indicated for the therapeutic termination of pregnancy, missed abortion and hydatidiform mole by the intravenous route.

Posology

Adults

Directions for the Preparation of a Dilute Solution:

For use by IV drip (a drip set delivering 60 drops/ per ml must be used) or constant rate infusion pump. Withdraw 0.5 ml from the ampoule using an aseptic technique and add to 1,000 ml of sterile normal saline or 5% dextrose. Shake to ensure uniformity.

After dilution, attach the infusion bag label provided. Use dilute solution within 24 hours of preparation and store in a refrigerator at 2-8°C.

The following is a guide to dosage:

A solution of Prostin E2 Sterile Solution in normal saline or 5% dextrose containing 5.0 micrograms per ml should be prepared in accordance with instructions given above. The initial rate of infusion (pump, or IV. drip delivering 60 drops per/ ml) will be 2.5 micrograms per minute, and this rate should be maintained for at least the first 30 minutes. If a satisfactory uterine contractility response is produced, this rate should be maintained; if not, the rate should be increased to 5 micrograms/ per minute. If satisfactory uterine activity is not produced after at least 4 hours at this rate of infusion, the rate may be increased up to 10 micrograms per minute, side-effects permitting, and maintained until abortion occurs or the treatment is considered a failure. If significant side-effects occur, the rate of infusion should be decreased by 50% or discontinued.

If a constant rate infusion pump is used, a different concentration of solution (e.g. 15 micrograms/ per ml) may be required, dependent on the type of pump, but the dose rates (micrograms/ per minute) should remain as above.

The appearance of uterine hypertonus requires cessation of therapy until the state returns to normal. The situation should be re-assessed and, if necessary, the infusion can be recommenced, but at lower dosage rates, 50% of the last dose level used.

In all cases the dosage should be adapted to the patient's response. Continuous administration of the drug for more than two days is not recommended.

Elderly

Not applicable.

Paediatric population

Not applicable.

Method of administration

For intravenous administration only.

Prostin E2 Sterile Solution should not be used where the patient is sensitive to prostaglandins.

Prostin E2 Sterile Solution 10 mg/ml is not recommended in the following circumstances:

- For patients in whom oxytocic drugs are generally contra-indicated or where prolonged contractions of the uterus are considered inappropriate such as:

- Cases with a history of Caesarean section or major uterine surgery.

- Cases where there is evidence of a potential for obstructed labour.

- In patients with a past history of, or existing, pelvic inflammatory disease, unless adequate prior treatment has been instituted.

- Patients with active cardiac, pulmonary, renal or hepatic disease.

Use caution in handling this product to prevent contact with skin. Wash hands thoroughly with soap and water after administration.

It is advised that Prostin E2 Sterile Solution should not be administered by the intramyometrial route since there have been reports of a possible association between this route of administration and cardiac arrest in severely ill patients.

Caution should be exercised in the administration of Prostin E2 Sterile Solution in patients with:

- asthma or a history of asthma

- epilepsy or a history of epilepsy

- glaucoma or raised intra-ocular pressure

- compromised cardiovascular, hepatic, or renal function

- hypertension.

As with any oxytocic agent, Prostin E2 Sterile Solution should be used with caution in patients with compromised (scarred) uteri.

Animal studies lasting several weeks at high doses have shown that prostaglandins of the E and F series can induce proliferation of bone. Such effects have also been noted in newborn infants who received prostaglandin E₁ during prolonged treatment. There is no evidence that short-term administration of prostaglandin E₂ can cause similar bone effects.

Women aged 35 years or older, those with complications during pregnancy and those with a gestational age over 40 weeks have been shown to have an increased risk of post-partum disseminated intravascular coagulation. In addition, these factors may further increase the risk associated with labour induction. Therefore, in these women, use of dinoprostone should be undertaken with caution. Measures should be applied to detect as soon as possible an evolving fibrinolysis in the immediate post-partum phase.

Ethanol (alcohol)

Depending on the daily dose administered this medicinal product will deliver varying amounts of ethanol.

This product contains 84.16% v/v ethanol (alcohol).

Once diluted with appropriate diluent this medicinal product contains 0.04% v/v ethanol (alcohol) i.e. up to 996 mg per maximum daily dose (infusion rate of 10 microgram/min per 24 hrs), equivalent to 36 ml of a 3.5% vol beer, 9 ml of a 14% vol wine per maximum daily dose. Harmful for those suffering from alcoholism. It should also be taken into account when considering using this medicine in children and high-risk groups such as patients with liver disease or epilepsy. The amount of alcohol in this medicinal product may alter the effects of other medicines.

Since it has been found that prostaglandins potentiate the effect of oxytocin, it is not recommended that these drugs are used together. If used in sequence, the patient's uterine activity should be carefully monitored.

Pregnancy

Prostin E2 Sterile Solution 10 mg/ml is only used during pregnancy for therapeutic termination of pregnancy, missed abortion and hydatidiform mole. There has been some evidence in animals of a low order of teratogenic activity, therefore, if abortion does not occur or is suspected to be incomplete as a result of prostaglandin therapy (as in spontaneous abortion, where the process is sometimes incomplete), the appropriate treatment for complete evacuation of the pregnant uterus should be instituted in all instances.

Breast-feeding

Prostaglandins are excreted in breast milk. This is not expected to be a hazard given the circumstances in which the product is used.

The amount of ethanol (alcohol) in this medicinal product may impair the patient's ability to drive or use machines.

Cardiac disorders: Cardiac arrest

Vascular disorders: Hypertension

Gastrointestinal disorders: Diarrhoea, nausea, vomiting

General disorders and administration site conditions: Fever, local tissue irritation / erythema (injection site), temporary pyrexia, local infections

Immune system disorders: Hypersensitivity reactions such as anaphylactoid reactions and anaphylactic reactions including anaphylactic shock

Investigations: Elevated WBC

Musculoskeletal and connective tissue disorders: Back pain

Nervous system disorders: Transient vasovagal symptoms (flushing, shivering, headache, dizziness)

Pregnancy and puerperium conditions:

Maternal-related conditions: Uterine hypertonus, uterine rupture, abruptio placenta, pulmonary amniotic fluid embolism, rapid cervical dilatation

Respiratory, thoracic and mediastinal disorders: Asthma, bronchospasm

Blood and lymphatic system disorders: An increased risk of post-partum disseminated intravascular coagulation has been described in patients whose labour was induced by pharmacological means, either with dinoprostone or oxytocin. The frequency of this adverse event, however, appears to be rare (<1 per 1,000 labours).

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard.

Overdosage may be expressed by uterine hypercontractility and uterine hypertonus. During use, uterine activity and the progression of cervical dilation should be carefully monitored to detect possible evidence of undesired responses, e.g. hypertonus or sustained uterine contractions. Because of the transient nature of prostaglandin E₂ (PGE₂)-induced myometrial hyperstimulation, non-specific, conservative management should be used (rate of infusion should be decreased or discontinued, maternal position change and administration of oxygen). If conservative management is not effective, a tocolytic agent may be used in appropriate patients as a treatment of hyperstimulation following administration of PGE₂ or appropriate measures should be considered.

Pharmacotherapeutic group: Prostaglandins, ATC-code: G02AD02

Dinoprostone is a prostaglandin of the E series with actions on smooth muscle. It induces contraction of uterine muscle at any stage of pregnancy.

Dinoprostone is rapidly metabolised in the body. Intravenous administration results in very rapid distribution and metabolism, with only 3% of unchanged drug remaining in the blood after 15 minutes. At least nine PGE₂ metabolites have been identified in human blood and urine.

There are no preclinical data of relevance to the prescriber which are additional to that already included in other sections of the Summary of Product Characteristics.

Dehydrated alcohol (ethanol).

Not applicable.

2 years.

Store in a refrigerator at 2-8°C.

Once diluted, the diluted solution should be stored in a refrigerator at 2-8°C and used within 24 hours.

Ph. Eur. Type I glass ampoule, containing 0.5 ml sterile solution, packed in a carton.

Use caution in handling this product to prevent contact with skin. Wash hands thoroughly with soap and water after administration.

Any unused medicinal product or waste material should be disposed of in accordance with local requirements.

Pfizer Limited

Ramsgate Road

Sandwich

Kent

CT13 9NJ

UK

PL 00057/1027

Date of first authorisation: 27 June 1986

Date of latest renewal: 28 October 2004

01/2018