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.

Usage is restricted to qualified health care professionals and to hospitals and clinics with specialised obstetric units with facilities for continuous monitoring.

The recommended dose should not be exceeded, and the dosing interval should not be shortened as this increases the risk of uterine hyperstimulation, uterine rupture, uterine haemorrhage, foetal and neonatal death.

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.

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.

• 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.

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

As with any oxytocic agent, the risk of uterine rupture should be considered. Concomitant medication, maternal and foetal status should be taken into consideration in order to minimise the risk of uterine hyperstimulation, uterine rupture, uterine haemorrhage, foetal and neonatal death. Careful and regular monitoring of uterine activity and foetal heart rate should be conducted during use of dinoprostone. Patients who develop uterine hypertonus or hypercontractility, or in whom unusual foetal heart rate patterns develop, should be managed in a manner that addresses the welfare of the foetus and mother.

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

• ruptured chorioamniotic membranes.

Dinoprostone should be used with caution in patients with multiple pregnancy.

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.

The response to oxytocin may be accentuated in the presence of exogenous prostaglandin therapy. Concurrent use with other oxytocic agents is not recommended. A dosing interval of at least 6 hours is recommended in case of oxytocin use is considered necessary following dinoprostone administration. If used in sequence, the patient's uterine activity should be carefully monitored.

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.

Not relevant.

The table below lists the adverse reactions identified through clinical trial experience and post-marketing surveillance by system organ class and frequency. Adverse reactions identified from post-marketing experience are included in italics. The frequency grouping is defined using the following convention: Very common (≥ 1/10); Common (≥ 1/100 to <1/10); Uncommon (≥ 1/1 000 to <1/100); Rare (≥ 1/10 000 to <1/1 000); Very Rare (< 1/10 000); and Not known (cannot be estimated from the available data). Within each frequency grouping, undesirable effects are presented in order of decreasing seriousness.

Table 1. Adverse Reactions

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 or search for MHRA Yellow Card in the Google Play or Apple App Store.

Overdosage may be expressed by uterine hypercontractility and uterine hypertonus. 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. 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.

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_2α production, similar to that which is seen in spontaneous labour.

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.

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.

Lactose

Microcrystalline Cellulose

Colloidal Silicon Dioxide

Maize Starch

Magnesium Stearate.

Not applicable.

2 years.

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.

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.

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.