This information is intended for use by health professionals

1. Name of the medicinal product

Prostin E2 Vaginal Tablets 3mg.

2. Qualitative and quantitative composition

Each tablet contains 3 mg dinoprostone.

For the full list of excipients, see section 6.1.

3. Pharmaceutical form

Vaginal tablet.

White, biconvex, oblong tablet, embossed with Upjohn 715 on one side and plain on the other.

4. Clinical particulars
4.1 Therapeutic indications

Oxytocic agent. Prostin E2 Vaginal Tablets are indicated for the induction of labour, especially in patients with favourable induction features, when there are no foetal or maternal contra-indications.

4.2 Posology and method of administration

Posology

Adults

One tablet to be inserted high into the posterior fornix. A second tablet may be inserted after six to eight hours if labour is not established. Maximum dose 6 mg.

Elderly

Not applicable.

Paediatric population

Not applicable.

Method of administration

Vaginally. The tablets should be inserted high into the posterior fornix.

4.3 Contraindications

Hypersensitivity to the active substance(s) or to any of the excipients listed in section 6.1.

Prostin E2 Vaginal Tablets should not be used where the patient is sensitive to prostaglandins or other constituents of the tablet.

Prostin E2 Vaginal Tablets are 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 cephalopelvic disproportion.

- Cases in which foetal malpresentation is present.

- Cases where there is clinical suspicion or definite evidence of pre-existing foetal distress.

- Cases in which there is a history of difficult labour and/or traumatic delivery.

- Grand multiparae with over five previous term pregnancies.

• Patients with ruptured membranes.

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

• In patients where there is clinical suspicion or definite evidence of placenta praevia or unexplained vaginal bleeding during this pregnancy.

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

4.4 Special warnings and precautions for use

This product is only available to hospitals and clinics with specialised obstetric units and should only be used where 24-hour resident medical cover is provided.

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

Caution should be exercised in the administration of Prostin E2 Vaginal Tablets for the induction of labour 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 Vaginal Tablets should be used with caution in patients with compromised (scarred) uteri.

In labour induction, cephalopelvic relationships should be carefully evaluated before use of Prostin E2 Vaginal Tablets. During use, uterine activity, foetal status and the progression of cervical dilation should be carefully monitored to detect possible evidence of undesired responses, e.g. hypertonus, sustained uterine contractions, or foetal distress.

In cases where there is a known history of hypertonic uterine contractility or tetanic uterine contractions, it is recommended that uterine activity and the state of the foetus (where applicable) should be continuously monitored throughout labour. The possibility of uterine rupture should be borne in mind where high-tone uterine contractions are sustained.

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 (see section 4.8). 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.

4.5 Interaction with other medicinal products and other forms of interaction

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.

4.6 Fertility, pregnancy and lactation

Pregnancy

Prostin E2 Vaginal Tablets are only used during pregnancy, to induce labour.

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.

4.7 Effects on ability to drive and use machines

Not relevant.

4.8 Undesirable effects

Cardiac disorders: Cardiac arrest

Vascular disorders: Hypertension

Gastrointestinal disorders: Diarrhoea, nausea, vomiting

General disorders and administration site conditions: Fever

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

Musculoskeletal and connective tissue disorders: Back pain

Pregnancy, puerperium and perinatal conditions:

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

Foetus-related conditions: Uterine hypercontractility with/without foetal bradycardia foetal distress/altered foetal heart rate (FHR)

Neonatal conditions: Neonatal distress, neonatal death, stillbirths, low Apgar score

Reproductive system and breast disorders: Warm feeling in vagina, irritation, pain

Respiratory, thoracic and mediastinal disorders: Asthma, bronchospasm

Skin and subcutaneous tissue disorders: Rash

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 (see section 4.4). 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.

4.9 Overdose

Overdosage may be expressed by uterine hypercontractility and uterine hypertonus. During use, uterine activity, fetal status and the progression of cervical dilation should be carefully monitored to detect possible evidence of undesired responses, e.g. hypertonus, sustained uterine contractions, or fetal distress. Because of the transient nature of prostaglandin E2 (PGE2)-induced myometrial hyperstimulation, non-specific, conservative management was found to be effective in the vast majority of cases: i.e. maternal position change and administration of oxygen to the mother. If conservative management is not effective, ß-adrenergic drugs may be used as a treatment of hyperstimulation following administration of PGE2 for cervical ripening, in appropriate patients.

5. Pharmacological properties
5.1 Pharmacodynamic properties

Pharmacotherapeutic group: Prostaglandins, ATC-code: G02AD02

Dinoprostone is a prostaglandin of the E series with actions on smooth muscle; the endogenous substance is termed prostaglandin E2. It induces contraction of uterine muscle at any stage of pregnancy and is reported to act predominantly as a vasodilator on blood vessels and as a bronchodilator on bronchial muscle. It is postulated that vaginal absorption of PGE2 stimulates endogenous PGE2 and PGF production, similar to that which is seen in spontaneous labour.

5.2 Pharmacokinetic properties

Following insertion of the tablet, PGE2 absorption (as measured by the presence of PGE2 metabolites) increases to reach a peak at about 40 minutes. PGE2 is rapidly metabolised to 13, 14-dihydro, 15-keto PGE2 which is converted to 13, 14-dihydro, 15-keto PGA2 which binds covalently to albumen.

There has been found to be inter-patient variability regarding systemic absorption of PGE2. This can be attributed to different conditions of the vaginal mucosa between patients.

5.3 Preclinical safety data

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.

6. Pharmaceutical particulars
6.1 List of excipients

Lactose

Microcrystalline Cellulose

Colloidal Silicon Dioxide

Maize Starch

Magnesium Stearate.

6.2 Incompatibilities

Not applicable.

6.3 Shelf life

2 years.

6.4 Special precautions for storage

Store in a refrigerator at 2-8°C.

Where the tablets are packed in a bottle, the tablets should be used within one month of opening the bottle.

6.5 Nature and contents of container

Amber glass bottle with screw cap and tac seal. Each bottle contains a desiccant capsule and 4 tablets.

Aluminium foil strip of 4 tablets, each box containing 4 or 8 tablets.

Not all pack sizes may be marketed.

6.6 Special precautions for disposal and other handling

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.

7. Marketing authorisation holder

Pfizer Limited

Ramsgate Road

Sandwich

Kent

CT13 9NJ

UK

8. Marketing authorisation number(s)

PL 00057/1516

9. Date of first authorisation/renewal of the authorisation

Date of first authorisation: 15 March 1982

Date of last renewal: 28 October 2004

10. Date of revision of the text

01/2018

Ref: PR 4_2