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Summary of Product Characteristics last updated on 1/9/2015

Suprefact 1mg/ml Solution for Injection


SUPREFACT 1mg/ml Solution for Injection


Each ml of solution for injection contains as active ingredient, 1.05mg buserelin acetate, equivalent to 1mg buserelin.

Each multidose vial of Suprefact Injection contains 5.5mg buserelin (equivalent to 5.78mg buserelin acetate) in 5.5ml solution for injection.

Excipients: Also contains 10.000mg benzyl alcohol per ml and 2.255mg sodium per ml.

For a full list of excipents, see section 6.1.


Solution for injection.

Clear, colourless, sterile solution for injection.


4.1 Therapeutic indications

(1) For the treatment of advanced prostatic carcinoma.

(2) Pituitary desensitisation prior to ovulation induction regimens using gonadotrophins (subcutaneous administration).

4.2 Posology and method of administration

To ensure that the desired effect it is very important that the individual doses be administered at approximately equal intervals. Patients must adhere to these intervals conscientiously.

Dosage is generally based on the following guidelines.

(1) Prostatic carcinoma

Initiation of therapy: is most conveniently carried out in hospital; 0.5 ml Suprefact injection should be injected subcutaneously at 8 hourly intervals for 7 days.

Maintenance therapy: on the 8th day of treatment the patient is changed to intranasal administration of Suprefact. (See manufacturer's instructions).

(2) For adjunctive use in ovulation induction (subcutaneous use only).

The total daily subcutaneous dose for this indication is 0.5 mg buserelin, given in one injection. Treatment should start in the early follicular phase (day 1 or 2) or, provided the existence of an early pregnancy has been excluded, in the mid-luteal phase (approx. day 21). It should continue at least until down-regulation is achieved (serum oestradiol < 50 ng/l and serum progesterone < 1 mcg/l). This will usually take about 2-3 weeks.

In some patients dosages up to 2 x 0.5 mg may be required to achieve these levels. When down-regulation is achieved, stimulation with gonadotrophin is commenced while the dosage of buserelin is maintained.

At the appropriate stage of follicular development, gonadotrophin and buserelin are stopped and hCG is given to induce ovulation.

Treatment monitoring, oocyte transfer and fertilisation techniques are performed according to the normal practice of the individual clinic.

Luteal support with hCG or progesterone should be given as appropriate.

4.3 Contraindications

Suprefact should not be used if the tumour is found to be insensitive to hormone manipulation or after surgical removal of the testes. Suprefact injection must not be administered in patients with hypersensitivity to buserelin or if applicable, to any of the excipients.

Suprefact Injection must not be administered in case of pregnancy. (see under section 4.6 Pregnancy and Lactation.)

Concerning use in breast-feeding women (see under section 4.6 Pregnancy and Lactation.)

4.4 Special warnings and precautions for use

Suprefact should only be used under the direction of a specialist having available appropriate facilities for monitoring the response to treatment. There is an increased risk of incident depression (which may be severe) in patients undergoing treatment with GnRH agonists, such as buserelin. Patients should be informed accordingly and treated as appropriate if symptoms occur. Patients with a history of depression must be monitored carefully and treated if necessary (risk of recurrence or worsening of depression).

In patients with hypertension, blood pressure must be monitored regularly (risk of deterioration of blood pressure levels).

Androgen deprivation therapy may prolong the QT interval.

In patients with a history of or risk factors for QT prolongation and in patients receiving concomitant medicinal products that might prolong the QT interval (see section 4.5) physicians should assess the benefit risk ratio including the potential for Torsade de pointes prior to initiating Suprefact.

In some patients treated with GnRH-agonists, change in glucose tolerance is observed (see section 4.8). In diabetic patients blood glucose levels must be checked regularly (risk of deterioration of metabolic control).

The use of LHRH- agonists may be associated with decreased bone density and may lead to osteoperosis and an increased risk of bone fracture (see section 4.8). Particularly in patients with known risk factors for osteoperosis (e.g. chronic alcohol abuse, smokers, long-term therapy with anticonvulsants or corticosteroids or a family history of osteoperosis), periodic monitoring of bone mineral density (BMD) and use of preventative measures are recommended during therapy to prevent osteopenia/osteoperosis (risk of decreased bone density that may lead to osteoporosis and increased risk of bone fracture). .

Prostatic carcinoma: Monitoring of the clinical effect of Suprefact is carried out by the methods generally used in prostatic carcinoma. Initially serum testosterone levels rise and a clinical effect will not be seen until levels start to fall into the therapeutic (castration) range. Disease flare (temporary deterioration of patient's condition) has been reported at the beginning of treatment. The incidence is variable, but of the order of 10%. Symptoms are usually confined to transient increase in pain, but the exact nature depends on the site of the lesions.

Neurological sequelae have been reported where secondary deposits impinge upon the spinal cord or CNS. Disease flare is prevented by the prophylactic use of an anti-androgen, e.g. cyproterone acetate, 300 mg daily. It is strongly recommended that administration of anti-androgen be started as adjunctive therapy about 5 days before the first dose of Suprefact and continued in parallel with buserelin for at least 3-4 weeks after commencement of Suprefact therapy. After this time testerone levels have usually fallen into the desired range in response to buserelin. If an anti-androgen is used over a period exceeding 2 weeks due attention should be paid to the contraindications and precautions associated with its prolonged use.

In patients with known metastases e.g. of the spinal column, this adjunctive therapy with an anti-androgen is indispensable to prevent initial complications up to and including, for example, spinal compression and paralysis, arising from transient activation of the tumor and its metastases (see also under section 4.8 Undesirable Effects)

The effect can be monitored clinically and by determination of prostate specific antigen (PSA) and testosterone in the serum. Testosterone levels increase in the beginning of the treatment and thereafter decreases during two weeks. After two to four weeks, the testosterone levels have decreased to castration level.

Once testosterone levels have started to fall below their baseline concentration clinical improvement should start to become apparent. If testosterone levels do not reach the therapeutic range within 4 weeks (6 weeks at the latest) the dose schedule should be checked to be sure that it is being followed exactly. It is unlikely that a patient who is taking the full dose will not show a suppression of testosterone to the therapeutic range. If this is the case, alternative therapy should be considered.

After the initial determination, testosterone levels should be monitored at 3-monthly intervals. A proportion of patients will have tumours that are not sensitive to hormone manipulation. Absence of clinical improvement in the face of adequate testosterone suppression is diagnostic of this condition, which will not benefit from further therapy with buserelin.

Published epidemiological studies suggest a relationship between gonadotropin-releasing hormone (GnRH) agonist treatment and increased risk of cardiovascular disease (such as myocardial infarction, sudden cardiac death, and stroke) and diabetes mellitus. These risks should be evaluated before initiating and during therapy, and patients should be monitored and treated accordingly.

Due to testosterone suppression, GnRH agonist therapy may increase the risk of anaemia. Patients should be evaluated for this risk and managed accordingly.

Adjunctive use in ovulation induction: Suprefact should be used under the care of a specialist with experience in the indication.

Before treatment is started, it is recommended that a pregnancy test be performed.

In-vitro fertilisation and induction of ovulation must be carried out under close medical supervision. Risks specific to IVF/ET and related assisted reproduction procedures - such as increase in miscarriages, ectopic and multiple pregnancies - are unaltered under adjunctive use of buserelin.

Follicle recruitment may be increased especially in patients with PCOD. In patients with PCOD ovulation induction may be more difficult.

The combination of gonadotrophins with buserelin carries a higher risk of development of ovarian hyperstimulation syndrome (OHSS) than the use of gonadotrophins alone.

In patients with polycystic ovarian syndrome, caution is recommended, because there is an increased tendancy towards ovarian hyperstimulation syndrome when combined with gonadotropines.

Possible clinical signs of ovarian hyperstimulation syndrome (OHSS) include: Abdominal pain, feeling of abdominal tension, increased abdominal girth, occurrence of ovarian cysts, nausea, vomiting, as well as massive enlargement of the ovaries, dyspnoea, diarrhoea, oligurea, haemoconcentration, hypercoagulability. Pedicle torsion or rupture of the ovary may lead to an acute abdomen. Severe thromboembolic events may also occur. Fatal outcome is possible.

Each stimulation cycle must be monitored carefully to permit early identification of affected patients. If necessary, administration of human chorionic gonadotrophin (hCG) must be foregone.

Ovarian cysts have been observed in the initial phase of buserelin treatment. No impact on the stimulation cycle has been reported so far.

4.5 Interaction with other medicinal products and other forms of interaction

Since androgen deprivation treatment may prolong the QT interval, the concomitant use of Suprefact with medicinal products known to prolong the QT interval or medicinal products able to induce Torsade de pointes such as class IA (e.g. quinidine, disopyramide) or class III (e.g. amiodarone, sotalol, dofetilide, ibutilide) antiarrhythmic medicinal products, methadone, moxifloxacin, antipsychotics, etc. should be carefully evaluated (see section 4.4).

During treatment with buserelin, the affect of antidiabetic agents may be attenuated.

In concomitant treatment with sexual hormones, the dosage is to be selected so as to ensure that the overall therapeutic effect is not affected.

4.6 Fertility, pregnancy and lactation

Suprefact must not be administered in case of pregnancy (see also under section 4.3 Contraindications)

Buserelin passes into breast milk in small amounts. Although negative effects on the infant have not been observed, it is recommended that breast-feeding be avoided during treatment with Suprefact in order to prevent the infant from ingesting small quantities of buserelin with breast-milk.

4.7 Effects on ability to drive and use machines

Certain adverse effects (e.g. dizziness) may impair the patient's ability to concentrate and react, and therefore, constitute a risk in situations where these abilities are of special importance (e.g. operating a vehicle or machinery).

4.8 Undesirable effects

In general: Buserelin treatment may lead to:

• Skin and subcutaneous tissue disorders: changes in scalp and body hair (increase or decrease).

• Vascular disorders: deterioration in blood pressure levels in patients with hypertension.

• Immune systems disorders: hypersensitivity reactions. These may manifest as e.g. reddening of the skin, itching, skin rashes (including urticaria) and allergic asthma with dyspnoea as well as, in isolated cases, leading to anaphylactic/anaphylactoid shock.

• Investigations: changes in blood lipids, increase in serum levels of liver enzymes (e.g. transaminases), increase in bilirubin, weight changes (increase or decrease)

• Cardiac disorders: palpitations Frequency unknown/rare/uncommon*: QT prolongation (see sections 4.4 and 4.5)

*frequency as derived from clinical trials/safety studies, if no data is available frequency should be labelled as “unknown”.

• Blood and lymphatic system disorders: thrombopenia and leucopenia.

• Nervous system disorders: headache (in women in rare cases migraine-like), sleep disturbances, drowsiness, disturbances of memory and concentration, dizziness

• General disorders and administration site reactions: tiredness

• Ear and labyrinth disorders: tinnitus, hearing disorders

• Eye disorders: impaired vision (e.g. blurred vision), feeling of pressure behind the eyes.

• Gastrointestinal disorders: nausea, vomiting, diarrhoea, constipation

• Metabolic and nutrition disorders: increased thirst, changes in appetite, reduction in glucose tolerance. This may, in diabetic patients, lead to a deterioration of metabolic control.

• Neoplasm benign, malignant and unspecified (including cysts and polyps): Very rare cases of pituitary adenomas were reported during treatment with LHRH agonists, including buserelin.

• Muscoskeletal and connective tissue disorders: musculoskeletal discomfort and pain (including shoulder pain/stiffness in women). The use of LHRH-agonists may be associated with decreased bone density and may lead to osteoporosis and an increased risk of bone fracture. The risk of skeletal fracture increases with the duration of therapy.

• Psychiatric disorders: nervousness, emotional instability, feelings of anxiety. Mood changes and depression (long term use: common, short term use: uncommon, as observed with GnRH agonists). Depression may develop or existing depression may worsen.

Pain or local reactions at the injection site are possible.

Prostatic carcinoma: At the beginning of treatment, a transient rise in the serum testosterone level usually develops and may lead to temporary activation of the tumour with secondary reactions such as:

• occurrence or exacerbation of bone pain in patients with bone metastases.

• signs of neurologic deficit due to tumour compression with e.g. muscle weakness in the legs.

• impaired micturition, hydronephrosis or lymphostasis.

• thrombosis with pulmonary embolism.

Such reactions can largely be avoided when an anti-androgen is given concomitantly in the initial phase of buserelin treatment (see also under section 4.4 Special Warnings and Precautions for use)

However, even with concomitant anti-androgen therapy, a mild but transient increase in tumour pain as well as a deterioration in general well-being may develop in some patients.

Additionally, hot flushes, atrophy of the testes and loss of potency and libido (in most patients; result of hormone deprivation), usually painless gynaecomastia (occasionally) as well as mild oedemas of the ankles and lower legs may occur.

Preparation for ovulation induction: Treatment with buserelin inhibits oestrogen production. In addition to the intended effects this may lead also to adverse effects (dose-dependent); i.e. where buserelin for preparation for ovulation induction is used at a low dosage, these effects occur less frequently and are less pronounced than in the treatment of endometriosis.

As additional manifestations of inhibited oestrogen production, in most cases uterine bleeding (“period”) occurs during the first weeks of treatment. Uterine bleeding may also occur in the further course of treatment.

As additional manifestations of inhibited oestrogen production, menopausal-like symptoms may also occur, such as hot flushes, increased sweating, vaginal dryness, dyspareunia, decreased libido, and after several months' treatment – a decrease in bone mass.

A decrease in bone mineral content, the magnitude of which relates to the duration of therapy, occurs in women during treatment with buserelin alone. The evidence available indicates that six months' treatment is associated with a decrease in bone mineral density of the spine of 3.5%. These changes are similar to those seen with other agonists. Increased levels of serum alkaline phosphates may occur. These are reversible on discontinuing treatment.

Very rare cases of pituitary adenomas were reported during treatment with LH RH agonists including buserelin.

Further adverse effects are not clearly attributable to hormone deprivation; increase or decrease in breast size with breast tenderness, splitting nails, acne, dry skin, vaginal discharge (occasional), oedema of the face and extremities (occasional). In addition, lactation, stomach ache, lower abdominal pain, paraesthesiae (especially in the arms and legs) may occur, as may dryness of the eyes, which may lead to eye irritation in wearers of contact lenses.

It is recommended to stop Suprefact treatment at the start of hCG treatment.

In-vitro fertilisation/embryo transfer programs and similar assisted reproduction procedures carry inherent risks, e.g. increased occurance of ectopic pregnancies, miscarriages or multiple pregnancies; this also applies where buserelin is used as adjunctive therapy. The fact that follicle recruitment may be increased under buserelin treatment (especially in the case of polycystic ovaries) may, however, in some patients also represent a desirable effect.

In the initial phase of treatment with buserelin ovarian cysts may develop. For preparation of ovulation induction, however, no negative effect on the course of stimulation has been reported so far.

Combined use of buserelin with gondatrophins may carry a higher risk of ovarian hyperstimulation syndrome (OHSS) than the use of gondatrophins alone (see also under 4.4 Special warnings and Precautions for Use)

Degeneration of uterine fibroids in women with uterine fibroids.

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 HPRA Pharmacovigilance, Earlsfort Terrace, IRL - Dublin 2; Tel: +353 1 6764971; Fax: +353 1 6762517. Website: E-mail:

4.9 Overdose

Overdose may lead to signs and symptoms such as asthenia, headache, nervousness, hot flushes, dizziness, nausea, abdominal pain, oedemas of the lower extremities and mastodynia, as well as local reactions at the injection site such as pain, haemorrhage and induration. Treatment should be symptomatic.


5.1 Pharmacodynamic properties

Buserelin is an analogue of the natural gonadotrophin-releasing hormone (gonadorelin; GnRH) with enhanced biological activity.

After repeated administration of buserelin, the secretion of gonadotrophins and gonadal steroids is significantly inhibited.

The pharmacological effect is attributable to the down-regulation of pituitary LH-RH receptors.

In male individuals the elimination of gonadotrophin release results in a lasting reduction in the synthesis and secretion of testosterone.

In female individuals the elimination of pulsatile gonadotrophin release reliably inhibits the secretion of oestrogen.

The suppressive effect of buserelin on the secretion of gonadal steroids depends on the daily dose, the frequency of application and the duration of treatment.

Even when the serum level of buserelin is below the detection limit, gonadotrophin release is preserved because of sustained binding to the receptors of the anterior lobe of the pituitary gland (approx. 3 hours).

While gonadotrophin release is inhibited during long-term treatment with buserelin, the secretion of the other pituitary hormones (growth hormone, prolactin, ACTH, TSH) is not directly influenced. However, oestrogen deficiency may lead to decreased secretion of growth hormone and prolactin. The secretion of adrenal steroids remains unchanged.

In terms of the complete inhibition of testicular testosterone synthesis, buserelin is equally effective as orchiectomy in the treatment of prostatic carcinoma. Compared with orchiectomy, buserelin offers the advantage of reversibility and reduced psychological stress for the patient.

5.2 Pharmacokinetic properties

Buserelin is water-soluble; when administered by subcutaneous injection it is reliably absorbed.

If administered correctly by the nasal route, it is absorbed via the nasal mucosa in such a way that sufficiently high plasma levels are guaranteed. The biological activity of buserelin was not impaired even after the induction of histamine rhinitis in test subjects.

The nasal absorption of buserelin from buserelin nasal solution is 1 to 3%. After subcutaneous injection of 200 micrograms buserelin is 70% bioavailable; in contrast, after oral administration, buserelin is ineffective.

Buserelin accumulates preferentially in the liver and kidneys as well as in the anterior pituitary lobe, the biological target organ.

The elimination half-life is approx. 50 to 80 minutes following intravenous administration, 80 to 120 minutes after subcutaneous administration and approx. 1 to 2 hours after intranasal administration.

Buserelin circulates in serum predominantly in intact active form. Protein binding is approx. 15%. Buserelin and inactive buserelin metabolites are excreted via the renal and biliary route. The serum concentration and the excretion of buserelin in the urine show the same time profile. In man approx. 50% of buserelin excreted in the urine is intact.

Buserelin is metabolised by peptidases (pyroglutamyl peptidase and chymotrypsin-like endopeptidases) in the liver and kidneys as well as in the gastrointestinal tract and by this means inactivated. In the pituitary gland, receptor-bound buserelin is inactivated by membrane-located enzymes.

A small proportion of the dose of buserelin is secreted into the breast milk. According to present clinical experience these amounts have no hormonal effect on the infant.

5.3 Preclinical safety data

None of clinical relevance.


6.1 List of excipients

Sodium hydroxide

Sodium chloride

Sodium dihydrogen phosphate

Benzyl alcohol

Water for injections.

6.2 Incompatibilities

In the absence of compatibility studies, this medicinal product must not be mixed with other medicinal products

6.3 Shelf life


2 years.


7 days.

6.4 Special precautions for storage

Do not store above 25°C. Do not freeze. Store in the original carton in order to protect from light. .

6.5 Nature and contents of container

Box of 1 x 5.5ml multidose vial.

Each vial consists of clear, colourless, Type I (PhEur) glass with a grey chlorobutyl rubber and an aluminium/polypropylene combination seal.

Pack size: 2 individual cardboard boxes are wrapped together in a clear plastic outer.

6.6 Special precautions for disposal and other handling

No special requirements.


sanofi-aventis Ireland Ltd, T/A SANOFI

Citywest Business Campus,

Dublin 24.


PA 540/74/1


Date of first authorisation: 28th August 1986

Date of last renewal: 16th August 2009


August 2015

It is recommended that you also refer to as the Summary of Product Characteristics may have been updated since this copy was printed.