Bicalutamide 150mg Film-coated Tablets

Each tablet contains 150 mg of bicalutamide.

Excipients: Contains 181.32 mg lactose monohydrate

For a full list of excipients, see section 6.1.

Film-coated tablet.

White, round, biconvex film-coated tablet, with the inscription “BCM 150” in one side.

Bicalutamide 150 mg tablets are indicated either alone or as adjuvant to radical prostatectomy or radiotherapy in patients with locally advanced prostate cancer at high risk for disease progression (see section 5.1).

Bicalutamide 150 mg tablets are also indicated for the management of patients with locally advanced, non-metastatic prostate cancer for whom surgical castration or other medical intervention is not considered appropriate or acceptable.

Adult males including the elderly

One 150 mg tablet once a day.

Route: oral

The tablets should be swallowed whole with liquid.

Bicalutamide 150 mg tablets should be taken continuously for at least 2 years or until disease progression.

Children and adolescents

Bicalutamide is not indicated in children and adolescents.

Renal impairment

No dose adjustment is necessary for patients with renal impairment. There is no experience with the use of bicalutamide in patients with severe renal impairment (creatinine clearance < 30 ml/min) (see section 4.4).

Hepatic impairment

No dose adjustment is necessary for patients with mild hepatic impairment.

The medicinal product may accumulate in patients with moderate to severe hepatic impairment (see section 4.4).

Hypersensitivity to bicalutamide or any of the excipients.

Bicalutamide is contraindicated in women and children.

Co-administration of terfenadine, astemizole or cisapride with bicalutamide is contra-indicated (see section 4.5).

Initiation of treatment should be under the direct supervision of a specialist.

Bicalutamide is extensively metabolised in the liver. Data suggests that its elimination may be slower in subjects with severe hepatic impairment and this could lead to increased accumulation of bicalutamide. Therefore, bicalutamide should be used with caution in patients with moderate to severe hepatic impairment.

Periodic liver function testing should be considered due to possibility of hepatic changes. The majority of changes are expected to occur within the first 6 months of bicalutamide therapy.

Severe hepatic changes and hepatic failure have been observed rarely with bicalutamide, and fatal outcomes have been reported (see section 4.8). Bicalutamide therapy should be discontinued if changes are severe.

For patients who have an objective progression of disease together with elevated PSA, cessation of bicalutamide therapy should be considered.

Bicalutamide has been shown to inhibit cytochrome P450 (CYP 3A4), as such, caution should be exercised when co-administered with drugs metabolised predominantly by CYP 3A4 (see sections 4.3 and 4.5).

Patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption should not take this medicine.

In vitro studies have shown that the R-enantiomer of bicalutamide is an inhibitor of CYP 3A4 with lesser inhibitory effects on CYP 2C9, 2C19 and 2D6 activity.

Although clinical studies using antipyrine as a marker of cytochrome P450 (CYP) activity showed no evidence of a drug interaction potential with bicalutamide, mean midazolam exposure (AUC) was increased by up to 80 %, after co-administration of bicalutamide for 28 days.

For drugs with a narrow therapeutic index such an increase could be of relevance. As such, concomitant use of terfenadine, astemizole and cisapride is contra-indicated and caution should be exercised with the co-administration of bicalutamide with compounds such as ciclosporin and calcium channel blockers. Dosage reduction may be required for these drugs particularly if there is evidence of enhanced or adverse drug effect. For ciclosporin, it is recommended that plasma concentrations and clinical condition are closely monitored following initiation or cessation of bicalutamide therapy.

Caution should be exercised when administering bicalutamide to patients taking medicinal products that inhibit the oxidation processes in the liver, e.g. cimetidine and ketoconazole. This could result in increased plasma concentrations of bicalutamide which theoretically could lead to an increase in side effects.

In vitro studies have shown that bicalutamide can displace the coumarin anticoagulant, warfarin, from its protein binding site. It is therefore recommended that prothrombin time is closely monitored if bicalutamide is started in patients who are already receiving coumarin anticoagulants.

Not applicable, since this medicinal product is not used in women.

Fertility

Reversible impairment of male fertility has been observed in animal studies (see section 5.3). A period of sub-fertility or infertility should be assumed in man.

No studies on the effects on the ability to drive and use machines have been performed. However, it should be noted that occasionally dizziness or somnolence may occur (see section 4.8). Any affected patients should exercise caution.

In this section, undesirable effects are defined as follows: 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), not known (cannot be estimated from the available data).

^a Hepatic changes are rarely severe and were frequently transient, resolving or improving with continued therapy or following cessation of therapy (see section 4.4).

^b The majority of patients receiving bicalutamide as monotherapy experience gynaecomastia and/or breast pain. In studies these symptoms were considered to be severe in up to 5% of the patients. Gynaecomastia may not resolve spontaneously following cessation of therapy, particularly after prolonged treatment.

No case of overdose has been reported. Since bicalutamide belongs to the anilide compounds there is a theoretical risk of the development of methaemoglobinaemia. Methaemoglobinaemia has been observed in animals after an overdose. Accordingly, a patient with an acute intoxication can be cyanotic. There is no specific antidote; treatment should be symptomatic. Dialysis is unlikely to be helpful, since bicalutamide is highly protein bound and is not recovered unchanged in the urine. General supportive care, including frequent monitoring of vital signs, is indicated.

Pharmacotherapeutic group: Hormone antagonists and related agents, anti-androgens

ATC code: L02BB03

Bicalutamide is a non-steroidal anti-androgen, devoid of other endocrine activity. It binds to the wild type or normal androgen receptors without activating gene expression, and thus inhibits the androgen stimulus. Regression of prostatic tumours results from this inhibition. Clinically discontinuation of bicalutamide can result in the “anti-androgen withdrawal syndrome” in a sub-set of patients.

Bicalutamide 150 mg was studied as a treatment for patients with localised (T1-T2, N0 or NX, M0) or locally advanced (T3-T4, any N, M0; T1-T2, N+, M0) non-metastatic prostate cancer in a combined analysis of 3 placebo controlled double-blind studies in 8113 patients, where bicalutamide was given as immediate hormonal therapy or as adjuvant to radical prostatectomy or radiotherapy (primarily external beam radiation). At 7.4 years median follow up, 27.4% of all bicalutamide-treated patients and 30.7% of all placebo-treated patients had experienced objective disease progression.

A reduction in risk of objective disease progression was seen across most patient groups but was most evident in those at highest risk of disease progression. Therefore, clinicians may decide that the optimum medical strategy for a patient at low risk of disease progression, particularly in the adjuvant setting following radical prostatectomy, may be to defer hormonal therapy until signs that the disease is progressing.

No overall survival difference was seen at 7.4 years median follow up with 22.9% mortality (HR=0.99; 95% CI 0.91 to1.09). However, some trends were apparent in exploratory subgroup analyses.

Progression-free survival and overall survival data for patients with locally advanced disease are summarised in the following tables:

Table 1 Progression-free survival in locally advanced disease by therapy sub-group

Table 2 Overall survival in locally advanced disease by therapy sub-group

For patients with localised disease receiving bicalutamide alone, there was no significant difference in progression free survival. In these patients there was also a trend toward decreased survival compared with placebo patients (HR=1.16; 95% CI 0.99 to 1.37). In view of this, the benefit-risk profile for the use of bicalutamide is not considered favourable in this group of patients.

In a separate programme, the efficacy of bicalutamide for the treatment of patients with locally advanced non-metastatic prostate cancer for whom immediate castration was indicated, was demonstrated in a combined analysis of two studies with 480 previously untreated patients with non-metastatic (M0) prostate cancer. At 56% mortality and a median follow-up of 6.3 years, there was no significant difference between bicalutamide and castration in survival (hazard ratio = 1.05 [CI=0.81 to 1.36]); however, equivalence of the two treatments could not be concluded statistically.

In a combined analysis of 2 clinical studies with 805 previously untreated patients with metastatic (M1) dinase at 43% mortality, bicalutamide was demonstrated to be less effective than castration in survival time (hazard ratio = 1.30 [CI 1.04 to 1.65]), with a numerical difference in estimated time to death of 42 days (6 weeks) over a median survival time of 2 years.

Bicalutamide is a racemate with its antiandrogen activity being almost exclusively in the R-enantiomer.

Bicalutamide is well absorbed following oral administration. There is no evidence of any clinically relevant effect of food on bioavailability.

The (S)-enantiomer is rapidly cleared relative to the (R)-enantiomer, the latter having a plasma elimination half-life of about 1 week.

On daily administration of bicalutamide, the (R)-enantiomer accumulates about 10-fold in plasma, as a consequence of its long half-life.

Steady state plasma concentrations of the (R)-enantiomer, of approximately 22μg/ml are observed during daily administration of bicalutamide 150mg. At steady state, the predominantly active (R)-enantiomer accounts for 99 % of the total circulating enantiomers.

The pharmacokinetics of the (R)-enantiomer are unaffected by age, renal impairment or mild to moderate hepatic impairment. There is evidence that the (R)-enantiomer is more slowly eliminated from plasma in patients with severe hepatic impairment.

Bicalutamide is highly protein bound (racemate 96%, enantiomer-(R) > 99%) and extensively metabolised (via oxidation and glucuronidation). Its metabolites are eliminated via the kidneys and bile in approximately equal proportions.

In clinical study, the mean concentration of (R)-enantiomer in semen of men receiving bicalutamide 150 mg was 4.9µg/ml. The amount of bicalutamide potentially delivered to a female partner during intercourse is low and equates to approximately 0.3µg/kg. This is below that required to induce changes in offspring of laboratory animals.

Bicalutamide is a pure and potent androgen receptor antagonist in experimental animals and humans.

The main secondary pharmacological action is induction of CYP450 dependent mixed function oxidases in the liver. Target organ changes, including tumour induction (Leydig cells, thyroid, liver), observed in animals, are clearly related to the primary and secondary pharmacological action of bicalutamide. The enzymatic induction was not observed in man and none of these findings was considered to have relevance to the treatment of advanced prostate cancer patients. The atrophy of seminiferous tubules is a predictable class effect of anti-androgens and has been observed in all the examined species. The total reversion of the testicles atrophy occurred 24 weeks after a toxicity study of repeated dose of 12 months in rats, although the function reversion has been evident in the reproduction studies of 7 weeks, after the end of an administration period of 11 weeks. In the man a period of sub-fertility or infertility should be considered.

Genotoxicity studies did not reveal any mutagenic potential of bicalutamide.

Tablet core:

Lactose monohydrate

Povidone K-29/32

Crospovidone Type A

Sodium lauryl sulphate

Magnesium stearate

Film-coating:

Lactose monohydrate

Hypromellose

Titanium dioxide (E171)

Macrogol 4000

Not applicable.

5 years.

This medicinal product does not require any special storage conditions.

Store in the original package.

20, 28, 30, 50, 84, 98 and 100 film-coated tablets in blister packs (PVC/PE/PVDC/ALU).

Not all pack sizes may be marketed.

No special requirements.

Winthrop Pharmaceuticals UK Limited

One Onslow Street

Guildford

Surrey

GU1 4YS

United Kingdom

Trading as:

Winthrop Pharmaceuticals, PO Box 611, Guildford, Surrey, GU1 4YS or Zentiva, One Onslow Street, Guildford, Surrey, GU1 4YS, UK

PL 17780/0341

21 November 2008

09 September 2011