Gina 10 micrograms vaginal tablets

Treatment of vaginal atrophy due to oestrogen deficiency in postmenopausal women aged 50 years and above, who have not had a period for at least 1 year (see section 5.1).

Gina is administered intravaginally as a local oestrogen therapy by use of an applicator.

Initial dose: One vaginal tablet daily for two weeks.

Maintenance dose: One vaginal tablet twice a week.

Reinstituting treatment: For patients still experiencing symptom relief after a break from therapy, it is recommended that treatment is restarted at the maintenance dose. For patients experiencing bothersome symptoms again after a break from therapy, it is recommended to restart treatment at the initial daily dose regimen for 2 weeks, followed by the maintenance twice weekly dose.

Switching from other local vaginal oestrogen preparations: Patients experiencing symptom relief from vaginal oestrogen preparations that are being used at the recommended dose can be switched to the maintenance dose of Gina provided:

Treatment may be started on any convenient day.

If a dose is forgotten, it should be used as soon as the patient remembers. A double dose should be avoided.

For initiation and continuation of treatment of postmenopausal symptoms, the lowest effective dose for the shortest duration (see also section 4.4) should be used.

For oestrogen products for vaginal application of which the systemic exposure to the oestrogen remains within the normal postmenopausal range, such as Gina, it is not recommended to add a progestagen (but see section 4.4, 'Special warnings and precautions for use', 'Endometrial hyperplasia and carcinoma').

Gina may be used in women with or without an intact uterus.

Method of administration:

1. Open the blister pack at the plunger end.

2. Insert the applicator in the vagina until resistance is met (8-10 cm).

3. Release the tablet by pressing the plunger.

4. Withdraw the applicator and discard.

• Known hypersensitivity to the active substance or to any of the excipients

• Known, past or suspected endometrial cancer

• Undiagnosed genital bleeding

• Untreated endometrial hyperplasia

• Women with an intact uterus who have previously been treated with unopposed systemic oestrogens

• Vulval dermatoses

• Current vaginal infection prior to starting treatment

• Vulval rash

• Severe vaginal itching

• Known, past or suspected oestrogen-dependent malignant tumours (e.g breast cancer, ovarian cancer)

• Previous or current venous thromboembolism (deep venous thrombosis, pulmonary embolism)

• Active or recent arterial thromboembolic disease (e.g. angina, myocardial infarction, ischaemic stroke)

• Known thrombophilic disorders (e.g. protein C, protein S, or antithrombin deficiency, see section 4.4)

• Acute liver disease, or a history of liver disease as long as liver function tests have failed to return to normal

• Porphyria.

Treatment initiation or reinstitution and medical examination

For the treatment of postmenopausal symptoms, HRT should only be initiated or reinstituted for symptoms that adversely affect quality of life. In all cases, a careful appraisal of the risks and benefits should be undertaken at every pharmacy visit for resupply and HRT should only be continued as long as the benefit outweighs the risk.

Before initiating or reinstituting hormone therapy, a complete personal and family medical history should be obtained. Women should be referred to their doctor before or at any time during treatment if this or the contraindications and warnings for use indicate a need for a physical (including pelvic and breast) examination by a doctor. Continued suitability of treatment with Gina should be verified at each supply. Women should be advised to report any unexpected vaginal bleeding to their doctor or nurse. Women should also be advised what changes in their breasts should be reported to their doctor or nurse (see 'Breast cancer' below). Investigations including appropriate imaging tools, e.g. mammography, should be carried out in accordance with currently accepted screening practices, modified to the clinical needs of the individual.

Conditions requiring a doctor referral before treatment initiation

• Women with a history of:

Women receiving hormonal therapy, including systemic HRT, unless she has previously received a prescription for a concurrent vaginal oestrogen product and her health status is unchanged since her last prescription.

• Women switching to Gina from another vaginal oestrogen product who have:

Follow-up

Women with symptoms that do not start to improve or worsen after 3 months of treatment, should be referred to their doctor.

The dose of Gina should not be increased.

If Gina does not relieve symptoms adequately, advice from a doctor should be sought.

The intravaginal applicator may cause minor local trauma, especially in women with serious vaginal atrophy.

Symptoms often recur when the treatment is stopped

Reasons for immediate withdrawal of therapy

Therapy should be discontinued, and advice sought from a doctor in case a contraindication is discovered or if the following situations occur or recur during treatment:

Prompt advice should also be sought from a doctor in the following situations:

Endometrial hyperplasia and carcinoma

Women with an intact uterus with abnormal bleeding of unknown aetiology or women with an intact uterus who have previously been treated with unopposed oestrogens should be examined with special care in order to exclude hyperstimulation/malignancy of the endometrium. Therefore use of vaginal oestrogens in these women should remain under the supervision of a doctor.

In women with an intact uterus the risk of endometrial hyperplasia and carcinoma is increased when systemic oestrogens are administered alone for prolonged periods. For oestrogen products for vaginal application of which the systemic exposure to oestrogen remains within the normal postmenopausal range, such as Gina, it is not recommended to add a progestagen.

Endometrial safety of long-term (more than one year) or repeated use of local vaginally administered oestrogen is uncertain. Therefore, if repeated, treatment should be reviewed at least annually, with special consideration given to any symptoms of endometrial hyperplasia or carcinoma.

If bleeding or spotting appears at any time during therapy, the reason should be investigated, which may include endometrial biopsy to exclude endometrial malignancy. The woman should be advised to contact her doctor in case bleeding or spotting occurs during treatment with Gina.

Unopposed oestrogen stimulation may lead to premalignant or malignant transformation in the residual foci of endometriosis. Therefore, caution is advised when using this product in women who have undergone hysterectomy because of endometriosis, especially if they are known to have residual endometriosis.

The following risks have been associated with systemic HRT and apply to a lesser extent for oestrogen products for vaginal application of which the systemic exposure to the oestrogen remains within the normal postmenopausal range.

The pharmacokinetic profile of Gina shows that there is very low systemic absorption of estradiol during treatment. A minor degree of systemic absorption may occur in some patients, especially during the first two weeks of once-daily administration. However, average plasma E2 concentrations (C_{ave (0-24)}) at all evaluated days remained within the normal postmenopausal range in all subjects (see section 5.2).

However, being an HRT product, the following need to be considered, especially for long-term or repeated use of this product.

Conditions that may be aggravated during exposure to oestrogen

The following conditions may recur or be aggravated during oestrogen treatment. If any of the following conditions are present, have occurred previously, and/or have been aggravated during pregnancy or previous hormone treatment, the patient should be advised to inform their doctor that they are using Gina and seek advice from a doctor if they recur or are aggravated during treatment:

• Leiomyoma (uterine fibroids)

• Risk factors for thromboembolic disorders (see below)

• Risk factors for oestrogen-dependent tumours, e.g. 1^st degree heredity for breast cancer

• Hypertension

• Liver Disorders (e.g. liver adenoma)

• Diabetes mellitus with or without vascular involvement

• Cholelithiasis

• Migraine or (severe) headache

• Systemic lupus erythematosus

• Epilepsy

• Asthma

• Otosclerosis.

Breast cancer

Epidemiological evidence from a large meta-analysis suggests no increase in risk of breast cancer in women with no history of breast cancer taking low dose vaginally applied oestrogens. It is unknown if low dose vaginal oestrogens stimulate recurrence of breast cancer.

Ovarian cancer

Ovarian cancer is much rarer than breast cancer.

Epidemiological evidence from a large meta-analysis suggests a slightly increased risk in women taking oestrogen-only systemic HRT, which becomes apparent within 5 years of use and diminishes over time after stopping.

Venous thromboembolism

Systemic HRT is associated with a 1.3- to 3-fold risk of developing venous thromboembolism (VTE), i.e. deep vein thrombosis or pulmonary embolism. The occurrence of such an event is more likely in the first year of HRT than later (see section 4.8).

Patients with known thrombophilic states have an increased risk of VTE and HRT may add to this risk. HRT is therefore contraindicated in these patients (see section 4.3).

Generally recognised risk factors for VTE include use of oestrogens, older age, major surgery, prolonged immobilisation, obesity (BMI >30 kg/m²), pregnancy/postpartum period, systemic lupus erythematosus (SLE) and cancer. There is no consensus about the possible role of varicose veins in VTE.

As in all postoperative patients, prophylactic measures need to be considered to prevent VTE following surgery. If prolonged immobilisation is to follow elective surgery, temporarily stopping HRT 4 to 6 weeks earlier is recommended. Treatment should not be restarted until the woman is completely mobilised.

In women with no personal history of VTE but with a first degree relative with a history of thrombosis at a young age, screening may be offered after careful counselling regarding its limitations (only a proportion of thrombophilic defects are identified by screening).

If a thrombophilic defect is identified which segregates with thrombosis in family members or if the defect is 'severe' (e.g. antithrombin, protein S, or protein C deficiencies or a combination of defects), HRT is contraindicated.

Women already on chronic anticoagulant treatment require careful consideration of the benefit-risk of use of HRT.

If VTE develops after initiating therapy, the drug should be discontinued. Patients should be told to contact their doctors immediately when they are aware of a potential thromboembolic symptom (e.g. painful swelling of a leg, sudden pain in the chest, dyspnoea).

Coronary artery disease (CAD)

Randomised controlled data found no increased risk of CAD in hysterectomised women using systemic oestrogen-only therapy.

Ischaemic stroke

Systemic oestrogen-only therapy is associated with an up to 1.5-fold increase in risk of ischaemic stroke. The relative risk does not change with age or time since menopause. However, as the baseline risk of stroke is strongly age-dependent, the overall risk of stroke in women who use HRT increases with age (see section 4.8).

Other conditions

Oestrogens may cause fluid retention, and therefore patients with cardiac or renal dysfunction should be carefully observed.

Women with pre-existing hypertriglyceridaemia should be followed closely during oestrogen replacement or hormone replacement therapy, since rare cases of large increases of plasma triglycerides leading to pancreatitis have been reported with oestrogen therapy in this condition.

Exogenous estrogens may induce or exacerbate symptoms of hereditary and acquired angioedema.

Oestrogens increase thyroid binding globulin (TBG) leading to increased circulating total thyroid hormone (as measured by protein-bound iodine (PBI)), T4 levels (by column or by radioimmunoassay) or T3 levels (by radioimmunoassay). T3 resin uptake is decreased, reflecting the elevated TBG. Free T4 and free T3 concentrations are unaltered. Other binding proteins may be elevated in serum, i.e. corticoid binding globulin (CBG), sex-hormone-binding globulin (SHBG) leading to increased circulating corticosteroids and sex steroids, respectively. Free or biologically active hormone concentrations are unchanged. Other plasma proteins may be increased (angiotensinogen/renin substrate, alpha-1-antitrypsin, ceruloplasmin).

The minimal systemic absorption of estradiol with local vaginal administration (see section 5.2 'Pharmacokinetic Properties') is likely to result in less pronounced effects on plasma binding proteins than with systemic hormones.

HRT does not improve cognitive function. There is some evidence from the WHI trial of increased risk of probable dementia in women who start using continuous combined or oestrogen-only HRT after the age of 65.

Evidence regarding the risks associated with HRT in the treatment of premature menopause is limited. Due to the low level of absolute risk in younger women, however, the balance of benefits and risks for these women may be more favourable than in older women.

Due to the vaginal administration and minimal systemic absorption, it is unlikely that any clinically relevant drug interactions will occur with Gina. However, interactions with other locally applied vaginal treatments should be considered.

Gina is not indicated during pregnancy. If pregnancy occurs during medication with Gina, treatment should be withdrawn immediately. The results of most epidemiological studies to date relevant to inadvertent foetal exposure to oestrogens indicate no teratogenic or foetotoxic effects.

Lactation

Gina is not indicated during lactation.

No effects known.

Adverse events from clinical trials:

More than 673 patients have been treated with estradiol 10 micrograms vaginal tablets in clinical trials, including over 497 patients treated up to 52 weeks.

Oestrogen-related adverse events such as breast pain, peripheral oedema and postmenopausal bleedings have been reported with estradiol 10 micrograms vaginal tablets at very low rates, similar to placebo, but if they occur, they are most likely present only at the beginning of the treatment. The adverse events observed with a higher frequency in patients treated with estradiol 10 micrograms vaginal tablets as compared to placebo and which are possibly related to treatment are presented below.

Post-marketing experience:

In addition to the above mentioned adverse drug reactions, those presented below have been spontaneously reported for patients being treated with estradiol 10 micrograms vaginal tablets and are considered possibly related to treatment. The frequencies for the below mentioned adverse drug reactions cannot be interpreted because these reactions are reported voluntarily from a population of uncertain size:

• Neoplasms benign and malignant (including cysts and polyps): breast cancer, endometrial cancer

• Immune system disorders: generalised hypersensitivity reactions (e.g. anaphylactic reaction/shock)

• Metabolism and nutrition disorders: fluid retention

• Psychiatric disorders: insomnia

• Nervous system disorders: migraine aggravated

• Vascular disorders: deep vein thrombosis

• Gastrointestinal disorders: diarrhoea

• Skin and subcutaneous tissue disorders: pruritus, rash, urticaria,

• Reproductive system and breast disorders: endometrial hyperplasia, vulvovaginal pain¹, pruritus genital

• General disorders and administration site conditions: application site reaction², drug ineffective, injury associated with device³

¹ Including Vulvovaginal burning sensation

² Local allergic reactions including Vulvovaginal erythema, Genital erythema, Vulvovaginal rash, Genital rash

³ Minor local trauma caused by intravaginal applicator

Other adverse reactions have been reported in association with systemic oestrogen/progestagen treatment. As risk estimates have been drawn from systemic exposure it is not known how these apply to local treatments:

• Gall bladder disease

• Skin and subcutaneous disorders: chloasma, erythema multiforme, erythema nodosum, vascular purpura

• Probable dementia over the age of 65 (see section 4.4).

Class effects associated with systemic HRT

The following risks have been associated with systemic HRT and may apply to a lesser extent for oestrogen products for vaginal application of which the systemic exposure to oestrogen remains within the normal postmenopausal range.

Ovarian cancer

Use of systemic HRT has been associated with a slightly increased risk of having ovarian cancer diagnosed (see section 4.4).

A meta-analysis from 52 epidemiological studies reported an increased risk of ovarian cancer in women currently using systemic HRT compared to women who have never used HRT (RR 1.43, 95% CI 1.31-1.56). For women aged 50 to 54 years who have been taking HRT for 5 years, this results in about 1 extra case per 2,000 users. In women aged 50 to 54 who do not take HRT, about 2 women in 2000 will be diagnosed with ovarian cancer over a 5-year period.

Risk of venous thromboembolism

Systemic HRT is associated with a 1.3- to 3-fold increased relative risk of developing venous thromboembolism (VTE), i.e. deep vein thrombosis or pulmonary embolism. The occurrence of such an event is more likely in the first year of using HRT (see section 4.4). Results of the WHI studies are presented below:

WHI Studies – Additional risk of VTE over 5 years' use

* Study in women with no uterus.

Risk of ischaemic stroke

The use of systemic HRT is associated with an up to 1.5-fold increased relative risk of ischaemic stroke. The risk of haemorrhagic stroke is not increased during the use of HRT.

This relative risk is not dependent on age or on duration of use, but as the baseline risk is strongly age-dependent, the overall risk of stroke in women who use HRT will increase with age (see section 4.4).

WHI studies combined – Additional risk of ischaemic stroke* over 5 years' use

* No differentiation was made between ischaemic and haemorrhagic stroke.

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 Website: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.

Gina is intended for intravaginal use and the dose of estradiol is very low. Overdose is therefore unlikely, but if it occurs, treatment is symptomatic.

Pharmacotherapeutic group: Natural and semisynthetic oestrogens, plain.

ATC code: G03CA03

The active ingredient, synthetic 17β -estradiol, is chemically and biologically identical to endogenous human estradiol.

Endogenous 17β -estradiol induces and maintains the primary and secondary female sexual characteristics. The biological effect of 17β -estradiol is carried out through a number of specific oestrogen receptors. The steroid receptor complex is bound to the cells' DNA and induces synthesis of specific proteins.

Maturation of the vaginal epithelium is dependent upon oestrogens. Oestrogens increase the number of superficial and intermediate cells and decrease the number of basal cells in vaginal smear.

Oestrogens maintain vaginal pH around normal range (4.5) which enhances normal bacterial flora.

Treatment of vaginal oestrogen deficiency symptoms: vaginally applied oestrogen alleviates the symptoms of vaginal atrophy due to oestrogen deficiency in postmenopausal women.

A 12-months, double-blind, randomised, parallel group, placebo-controlled, multicentre study was conducted to evaluate the efficacy and safety of estradiol 10 micrograms vaginal tablets in the treatment of postmenopausal vaginal atrophy symptoms.

After 12 weeks of treatment with estradiol 10 micrograms vaginal tablets, the change from baseline, in comparison with placebo treatment, demonstrated significant improvements in the three primary endpoints: Vaginal Maturation Index and Value, normalisation of vaginal pH and relief of the moderate/severe urogenital symptoms considered most bothersome by the subjects.

The effect of treatment on the most bothersome vaginal symptoms (e.g. painful sexual intercourse, vaginal dryness and itching) became apparent after 4 weeks versus placebo, reaching statistical significance versus placebo after 8 weeks.

Endometrial safety of estradiol 10 micrograms vaginal tablets was evaluated in the above mentioned trial and a second, open-label, multicentre trial. In total, 386 women underwent endometrial biopsy at the beginning and at the end of 52 weeks treatment. Incidence rate of hyperplasia and/or carcinoma was 0.52% (95% CI 0.06%, 1.86%), indicating no increased risk.

Absorption

Oestrogens are well absorbed through the skin, mucous membranes and the gastrointestinal tract. After vaginal administration, estradiol is absorbed circumventing first-pass metabolism.

A 12-weeks, single-centre, randomised, open-label, multiple dose, parallel-group trial was conducted to evaluate the extent of systemic absorption of estradiol from the estradiol 10 micrograms vaginal tablet. Subjects were randomised 1:1 to receive either 10 micrograms or 25 micrograms estradiol vaginal tablet. Plasma levels of estradiol (E2), estrone (E1) and estrone sulfate (E1S) were determined. The AUC_(0-24) for plasma E2 levels increased almost proportionally after the administration of 10 micrograms and 25 micrograms estradiol vaginal tablet. The AUC_(0-24) indicated higher systemic estradiol levels for the 10 micrograms E2 tablet as compared to baseline on treatment days 1, 14 and 83, being statistically significant at days 1 and 14 (Table 1). However, average plasma E2 concentrations (C_{ave (0-24)}) at all evaluated days remained within the normal postmenopausal range in all subjects. The data from days 82 and 83 as compared to baseline indicate that there is no cumulative effect during twice-weekly maintenance therapy.

Table 1 Values of PK parameters from plasma Estradiol (E2) concentrations:

The levels of estrone and estrone sulfate seen after 12 weeks of estradiol 10 micrograms vaginal tablets administration did not exceed baseline levels, i.e. no accumulation of estrone or estrone sulfate was observed.

Distribution

The distribution of exogenous oestrogens is similar to that of endogenous oestrogens. Oestrogens are widely distributed in the body and are generally found in higher concentrations in the sex hormone target organs. Oestrogens circulate in the blood largely bound to sex hormone binding globulin (SHBG) and albumin.

Biotransformation

Exogenous oestrogens are metabolized in the same manner as endogenous oestrogens. The metabolic transformations take place mainly in the liver. Estradiol is converted reversibly to estrone and both can be converted to estriol which is the major urinary metabolite. In postmenopausal women, a significant portion of the circulating oestrogens exists as sulfate conjugates, especially estrone sulfate, which serves as a circulating reservoir for the formation of more active oestrogens.

Elimination

Estradiol, estrone and estriol are excreted in the urine along with glucuronide and sulfate conjugates.

Special patient groups

The extent of systemic absorption of estradiol during treatment with estradiol 10 micrograms vaginal tablets has been evaluated in postmenopausal women aged 60– 70 (mean age 65.4) only.

17β -estradiol is a well-known substance. Non-clinical studies provided no additional data of relevance to clinical safety beyond those already included in other sections of the SmPC.

Tablet core:

Hypromellose

Lactose monohydrate

Maize starch

Magnesium stearate

Film-coating:

Hypromellose

Macrogol 6000

Not applicable.

3 years.

Do not refrigerate.

Each tablet is contained in a disposable, single-use, polyethylene/polypropylene applicator. The applicators are packed separately in PVC/aluminium foil blisters.

24 vaginal tablets with applicators

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

17β -estradiol is expected to pose a risk to the aquatic environment, especially to fish populations.