FDA Label for Temozolomide

1.1 Newly Diagnosed Glioblastoma Multiforme

Temozolomide capsule is indicated for the treatment of adult patients with newly diagnosed glioblastoma multiforme concomitantly with radiotherapy and then as maintenance treatment.

1.2 Refractory Anaplastic Astrocytoma

Temozolomide capsule is indicated for the treatment of adult patients with refractory anaplastic astrocytoma, i.e., patients who have experienced disease progression on a drug regimen containing nitrosourea and procarbazine.

2.1 Recommended Dosing And Dose Modification Guidelines

Dosage of temozolomide capsules must be adjusted according to nadir neutrophil and platelet counts in the previous cycle and the neutrophil and platelet counts at the time of initiating the next cycle. For temozolomide capsules dosage calculations based on body surface area (BSA) see Table 5. For suggested capsule combinations on a daily dose see Table 6.

3 Dosage Forms And Strengths

• Temozolomide capsules for oral administration
  • 5-mg capsules have white bodies with green caps. The capsule body is imprinted with '5'. The cap is imprinted with 'TMZ'.
  • 20-mg capsules have white bodies with yellow caps. The capsule body is imprinted with '20'. The cap is imprinted with 'TMZ'.
  • 100-mg capsules have white bodies with pink caps. The capsule body is imprinted with '100'. The cap is imprinted with 'TMZ'.
  • 140-mg capsules have white bodies with transparent blue caps. The capsule body is imprinted with '140'. The cap is imprinted with 'TMZ'.
  • 180-mg capsules have white bodies with maroon caps. The capsule body is imprinted with '180'. The cap is imprinted with 'TMZ'.
  • 250-mg capsules have white bodies with white caps. The capsule body is imprinted with '250'. The cap is imprinted with 'TMZ'.
  
  

4.1 Hypersensitivity

Temozolomide capsule is contraindicated in patients who have a history of hypersensitivity reaction (such as urticaria, allergic reaction including anaphylaxis, toxic epidermal necrolysis, and Stevens-Johnson syndrome) to any of its components. Temozolomide capsule is also contraindicated in patients who have a history of hypersensitivity to dacarbazine (DTIC), since both drugs are metabolized to 5-(3-methyltriazen-1-yl)-imidazole-4-carboxamide (MTIC).

5.1 Myelosuppression

Patients treated with temozolomide may experience myelosuppression, including prolonged pancytopenia, which may result in aplastic anemia, which in some cases has resulted in a fatal outcome. In some cases, exposure to concomitant medications associated with aplastic anemia, including carbamazepine, phenytoin, and sulfamethoxazole/trimethoprim, complicates assessment. Prior to dosing, patients must have an absolute neutrophil count (ANC) greater than or equal to 1.5 x 10 ⁹/L and a platelet count greater than or equal to 100 x 10 ⁹/L. A complete blood count should be obtained on Day 22 (21 days after the first dose) or within 48 hours of that day, and weekly until the ANC is above 1.5 x 10 ⁹/L and platelet count exceeds 100 x 10 ⁹/L. Geriatric patients and women have been shown in clinical trials to have a higher risk of developing myelosuppression.

5.2 Myelodysplastic Syndrome

Cases of myelodysplastic syndrome and secondary malignancies, including myeloid leukemia, have been observed.

5.3 Pneumocystis Pneumonia

For treatment of newly diagnosed glioblastoma multiforme: Prophylaxis against Pneumocystis pneumonia (PCP) is required for all patients receiving concomitant temozolomide and radiotherapy for the 42-day regimen.

There may be a higher occurrence of  PCP when temozolomide is administered during a longer dosing regimen. However, all patients receiving temozolomide, particularly patients receiving steroids, should be observed closely for the development of  PCP regardless of the regimen.

5.4 Laboratory Tests

For the concomitant treatment phase with RT, a complete blood count should be obtained prior to initiation of treatment and weekly during treatment.

For the 28-day treatment cycles, a complete blood count should be obtained prior to treatment on Day 1 and on Day 22 (21 days after the first dose) of each cycle. Blood counts should be performed weekly until recovery if the ANC falls below 1.5 x 10 ⁹/L and the platelet count falls below 100 x 10 ⁹/L [see Recommended Dosing and Dose Modification Guidelines (2.1)].

5.5 Hepatotoxicity

Fatal and severe hepatotoxicity have been reported in patients receiving temozolomide. Perform liver function tests at baseline, midway through the first cycle, prior to each subsequent cycle, and approximately two to four weeks after the last dose of temozolomide.

5.6 Use In Pregnancy

Temozolomide can cause fetal harm when administered to a pregnant woman. Administration of temozolomide to rats and rabbits during organogenesis at 0.38 and 0.75 times the maximum recommended human dose (75 and 150 mg/m ²), respectively, caused numerous fetal malformations of the external organs, soft tissues, and skeleton in both species [see Use in Specific Populations (8.1)] .

6.1 Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

6.2 Postmarketing Experience

The following adverse reactions have been identified during postapproval use of temozolomide. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to the drug exposure.

Dermatologic disorders: Toxic epidermal necrolysis and Stevens-Johnson syndrome

Immune system disorders: Allergic reactions, including anaphylaxis. Erythema multiforme, which resolved after discontinuation of temozolomide capsules and, in some cases, recurred upon rechallenge.

Hematopoietic disorders: Prolonged pancytopenia, which may result in aplastic anemia and fatal outcomes [ see Warnings and Precautions (5.1)].

Hepatobiliary disorders: Fatal and severe hepatotoxicity, elevation of liver enzymes, hyperbilirubinemia, cholestasis, and hepatitis [ see Warnings and Precautions (5.5)].

Infections and infestations: Opportunistic infections including Pneumocystis pneumonia (PCP) [ see Warnings and Precautions (5.3)], primary and reactivated cytomegalovirus (CMV), and reactivation of hepatitis B infections including some cases with fatal outcomes.

Pulmonary disorders: Interstitial pneumonitis, pneumonitis, alveolitis, and pulmonary fibrosis.

Endocrine disorders: Diabetes insipidus

7.1 Valproic Acid

Administration of valproic acid decreases oral clearance of temozolomide by about 5%. The clinical implication of this effect is not known [see Clinical Pharmacology (12.3)].

8.3 Nursing Mothers

It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants and tumorigenicity shown for temozolomide in animal studies, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of temozolomide to the mother.

8.4 Pediatric Use

Safety and effectiveness in pediatric patients have not been established. Temozolomide capsules have been studied in 2 open-label studies in pediatric patients (aged 3 to 18 years) at a dose of 160 to 200 mg/m ² daily for 5 days every 28 days. In one trial, 29 patients with recurrent brain stem glioma and 34 patients with recurrent high grade astrocytoma were enrolled. All patients had recurrence following surgery and radiation therapy, while 31% also had disease progression following chemotherapy. In a second study conducted by the Children's Oncology Group (COG), 122 patients were enrolled, including patients with medulloblastoma/PNET (29), high grade astrocytoma (23), low grade astrocytoma (22), brain stem glioma (16), ependymoma (14), other CNS tumors (9), and non-CNS tumors (9). The temozolomide toxicity profile in pediatric patients is similar to adults. Table 10 shows the adverse reactions in 122 children in the COG study.

8.5 Geriatric Use

Clinical studies of temozolomide did not include sufficient numbers of subjects aged 65 and over to determine whether they responded differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. In general, dose selection for an elderly patient should be cautious, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy.

In the anaplastic astrocytoma study population, patients 70 years of age or older had a higher incidence of Grade 4 neutropenia and Grade 4 thrombocytopenia (2/8; 25%, P=0.31 and 2/10; 20%, P=0.09, respectively) in the first cycle of therapy than patients under 70 years of age [see Warnings and Precautions (5.1) and Adverse Reactions (6.1)].

In newly diagnosed patients with glioblastoma multiforme, the adverse reaction profile was similar in younger patients (<65 years) vs. older (≥65 years).

8.6 Renal Impairment

Caution should be exercised when temozolomide is administered to patients with severe renal impairment [see Clinical Pharmacology (12.3)].

8.7 Hepatic Impairment

Caution should be exercised when temozolomide is administered to patients with severe hepatic impairment [see Clinical Pharmacology (12.3)].

10 Overdosage

Doses of 500, 750, 1000, and 1250 mg/m ² (total dose per cycle over 5 days) have been evaluated clinically in patients. Dose-limiting toxicity was hematologic and was reported with any dose but is expected to be more severe at higher doses. An overdose of 2000 mg per day for 5 days was taken by one patient and the adverse reactions reported were pancytopenia, pyrexia, multi-organ failure, and death. There are reports of patients who have taken more than 5 days of treatment (up to 64 days), with adverse reactions reported including bone marrow suppression, which in some cases was severe and prolonged, and infections and resulted in death. In the event of an overdose, hematologic evaluation is needed. Supportive measures should be provided as necessary.

11 Description

Temozolomide capsule contains temozolomide, an imidazotetrazine derivative. The chemical name of temozolomide is 3,4-dihydro-3-methyl-4-oxoimidazo[5,1-d]- as-tetrazine-8-carboxamide. The structural formula is:

Chemical Structure - temo structure

The material is a white to light tan/light pink powder with a molecular formula of C ₆H ₆N ₆O ₂ and a molecular weight of 194.15. The molecule is stable at acidic pH (<5) and labile at pH >7; hence temozolomide can be administered orally. The prodrug, temozolomide, is rapidly hydrolyzed to the active 5-(3-methyltriazen-1-yl) imidazole-4-carboxamide (MTIC) at neutral and alkaline pH values, with hydrolysis taking place even faster at alkaline pH.

Other

Temozolomide Capsules:

Each capsule for oral use contains either 5 mg, 20 mg, 100 mg, 140 mg, 180 mg, or 250 mg of temozolomide.

The inactive ingredients for temozolomide capsules are as follows:

Temozolomide capsules 5 mg: lactose anhydrous (168 mg), colloidal anhydrous silica (1 mg), sodium starch glycolate (16 mg), tartaric acid (7 mg), and stearic acid (3 mg).

Temozolomide capsules 20 mg: lactose anhydrous (14.6 mg), colloidal anhydrous silica (0.2 mg), sodium starch glycolate (3.2 mg), tartaric acid (1.4 mg), and stearic acid (0.6 mg).

Temozolomide capsules 100 mg: lactose anhydrous (73 mg), colloidal anhydrous silica (1 mg), sodium starch glycolate (16 mg), tartaric acid (7 mg), and stearic acid (3 mg).

Temozolomide capsules 140 mg: lactose anhydrous (102.2 mg), colloidal anhydrous silica (1.4 mg), sodium starch glycolate (22.4 mg), tartaric acid (9.8 mg), and stearic acid (4.2 mg).

Temozolomide capsules 180 mg: lactose anhydrous (131.4 mg), colloidal anhydrous silica (1.8 mg), sodium starch glycolate (28.8 mg), tartaric acid (12.6 mg), and stearic acid (5.4 mg).

Temozolomide capsules 250 mg: lactose anhydrous (182.5 mg), colloidal anhydrous silica (2.5 mg), sodium starch glycolate (40 mg), tartaric acid (17.5 mg), and stearic acid (7.5 mg).

The body of the capsules is made of gelatin, and is white. The body of 250 mg capsule contain additionally sodium lauryl sulfate. The cap is also made of gelatin, and the colors vary based on the dosage strength. The capsule body and cap are imprinted with pharmaceutical branding ink, which contains black iron oxide, potassium hydroxide and shellac.

Temozolomide capsules 5 mg: The green cap contains gelatin, titanium dioxide, iron oxide yellow and FD&C Blue 2.

Temozolomide capsules 20 mg: The yellow cap contains gelatin, titanium dioxide and iron oxide yellow.

Temozolomide capsules 100 mg: The pink cap contains gelatin, titanium dioxide and iron oxide red.

Temozolomide capsules 140 mg: The transparent blue cap contains gelatin and FD&C Blue 2.

Temozolomide capsules 180 mg: The maroon cap contains gelatin, iron oxide red, iron oxide yellow and titanium dioxide.

Temozolomide capsules 250 mg: The white cap contains gelatin, titanium dioxide and sodium lauryl sulfate.

12.1 Mechanism Of Action

Temozolomide is not directly active but undergoes rapid nonenzymatic conversion at physiologic pH to the reactive compound 5-(3-methyltriazen-1-yl)-imidazole-4-carboxamide (MTIC). The cytotoxicity of MTIC is thought to be primarily due to alkylation of DNA. Alkylation (methylation) occurs mainly at the O ⁶ and N ⁷ positions of guanine.

13.1 Carcinogenesis, Mutagenesis, Impairment Of Fertility

Temozolomide is carcinogenic in rats at doses less than the maximum recommended human dose. Temozolomide induced mammary carcinomas in both males and females at doses 0.13 to 0.63 times the maximum human dose (25 to 125 mg/m ²) when administered orally on 5 consecutive days every 28 days for 6 cycles. Temozolomide also induced fibrosarcomas of the heart, eye, seminal vesicles, salivary glands, abdominal cavity, uterus, and prostate, carcinomas of the seminal vesicles, schwannomas of the heart, optic nerve, and harderian gland, and adenomas of the skin, lung, pituitary, and thyroid at doses 0.5 times the maximum daily dose. Mammary tumors were also induced following 3 cycles of temozolomide at the maximum recommended daily dose.

Temozolomide is a mutagen and a clastogen. In a reverse bacterial mutagenesis assay (Ames assay), temozolomide increased revertant frequency in the absence and presence of metabolic activation. Temozolomide was clastogenic in human lymphocytes in the presence and absence of metabolic activation.

Temozolomide impairs male fertility. Temozolomide caused syncytial cells/immature sperm formation at 0.25 and 0.63 times the maximum recommended human dose (50 and 125 mg/m ²) in rats and dogs, respectively, and testicular atrophy in dogs at 0.63 times the maximum recommended human dose (125 mg/m ²).

13.2 Animal Toxicology And/Or Pharmacology

Toxicology studies in rats and dogs identified a low incidence of hemorrhage, degeneration, and necrosis of the retina at temozolomide doses equal to or greater than 0.63 times the maximum recommended human dose (125 mg/m ²). These changes were most commonly seen at doses where mortality was observed.

14.1 Newly Diagnosed Glioblastoma Multiforme

Five hundred and seventy-three patients were randomized to receive either temozolomide (TMZ)+Radiotherapy (RT) (n=287) or RT alone (n=286). Patients in the temozolomide+RT arm received concomitant temozolomide (75 mg/m ² ) once daily, starting the first day of RT until the last day of RT, for 42 days (with a maximum of 49 days). This was followed by 6 cycles of temozolomide alone (150 or 200 mg/m ²) on Days 1 to 5 of every 28-day cycle, starting 4 weeks after the end of RT. Patients in the control arm received RT only. In both arms, focal radiation therapy was delivered as 60 Gy/30 fractions. Focal RT includes the tumor bed or resection site with a 2 to 3-cm margin. Pneumocystis pneumonia (PCP) prophylaxis was required during the TMZ + RT, regardless of lymphocyte count, and was to continue until recovery of lymphocyte count to less than or equal to Grade 1.

At the time of disease progression, temozolomide was administered as salvage therapy in 161 patients of the 282 (57%) in the RT alone arm, and 62 patients of the 277 (22%) in the temozolomide+RT arm.

The addition of concomitant and maintenance temozolomide to radiotherapy in the treatment of patients with newly diagnosed GBM showed a statistically significant improvement in overall survival compared to radiotherapy alone ( Figure 1). The hazard ratio (HR) for overall survival was 0.63 (95% CI for HR=0.52 -0.75) with a log-rank P<0.0001 in favor of the temozolomide arm. The median survival was increased by 2.5 months in the temozolomide arm.

FIGURE 1: Kaplan-Meier Curves for Overall Survival (ITT Population)

FIGURE 1: Kaplan-Meier Curves for Overall Survival (ITT Population) - temo figure 1

14.2 Refractory Anaplastic Astrocytoma

A single-arm, multicenter study was conducted in 162 patients who had anaplastic astrocytoma at first relapse and who had a baseline Karnofsky performance status of 70 or greater. Patients had previously received radiation therapy and may also have previously received a nitrosourea with or without other chemotherapy. Fifty-four patients had disease progression on prior therapy with both a nitrosourea and procarbazine, and their malignancy was considered refractory to chemotherapy (refractory anaplastic astrocytoma population). Median age of this subgroup of 54 patients was 42 years (19 to 76). Sixty-five percent were male. Seventy-two percent of patients had a KPS of >80. Sixty-three percent of patients had surgery other than a biopsy at the time of initial diagnosis. Of those patients undergoing resection, 73% underwent a subtotal resection and 27% underwent a gross total resection. Eighteen percent of patients had surgery at the time of first relapse. The median time from initial diagnosis to first relapse was 13.8 months (4.2 to 75.4).

Temozolomide capsules were given for the first 5 consecutive days of a 28-day cycle at a starting dose of 150 mg/m ²/day. If the nadir and day of dosing (Day 29, Day 1 of next cycle) absolute neutrophil count was greater than or equal to 1.5 x 10 ⁹/L (1500/μL) and the nadir and Day 29, Day 1 of next cycle platelet count was greater than or equal to 100 x 10 ⁹/L (100,000/μL), the temozolomide dose was increased to 200 mg/m ²/day for the first 5 consecutive days of a 28-day cycle.

In the refractory anaplastic astrocytoma population, the overall tumor response rate (CR + PR) was 22% (12/54 patients) and the complete response rate was 9% (5/54 patients). The median duration of all responses was 50 weeks (range: 16 to 114 weeks) and the median duration of complete responses was 64 weeks (range: 52 to 114 weeks). In this population, progression-free survival at 6 months was 45% (95% CI: 31% to 58%) and progression-free survival at 12 months was 29% (95% CI: 16% to 42%). Median progression-free survival was 4.4 months. Overall survival at 6 months was 74% (95% CI: 62% to 86%) and 12-month overall survival was 65% (95% CI: 52% to 78%). Median overall survival was 15.9 months.

15 References

• OSHA Technical Manual, TED 1-0.15A, Section VI: Chapter 2. Controlling Occupational Exposure to Hazardous Drugs. OSHA, 1999.
• American Society of Health-System Pharmacists. ASHP guidelines on handling hazardous drugs. Am J Health-Syst Pharm. 2006; 63:1172-1193.
• NIOSH Alert: Preventing occupational exposures to antineoplastic and other hazardous drugs in healthcare settings. 2004. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2004-165.[3]
• Polovich, M., White, J. M., & Kelleher, L.O. (eds.) 2005. Chemotherapy and biotherapy guidelines and recommendations for practice (2nd. ed.) Pittsburgh, PA: Oncology.

16.1 Safe Handling And Disposal

Care should be exercised in the handling and preparation of temozolomide capsules. Vials and capsules should not be opened. If vials or capsules are accidentally opened or damaged, rigorous precautions should be taken with the contents to avoid inhalation or contact with the skin or mucous membranes. The use of gloves and safety glasses is recommended to avoid exposure in case of breakage of the vial or capsules. Procedures for proper handling and disposal of anticancer drugs should be considered {1–4}. Several guidelines on this subject have been published.

16.3 Storage

Store temozolomide capsules at 25°C (77°F) [see USP Controlled Room Temperature]; excursions permitted to 15°C to 30°C (59°F to 86°F).

17 Patient Counseling Information

[see FDA-Approved Patient Labeling (Patient Information)].

17.1 Information For The Patient

Physicians should discuss the following with their patients:

• Nausea and vomiting are the most frequently occurring adverse reactions. Nausea and vomiting are usually either self-limiting or readily controlled with standard antiemetic therapy.
• Capsules should not be opened. If capsules are accidentally opened or damaged, rigorous precautions should be taken with the capsule contents to avoid inhalation or contact with the skin or mucous membranes.
• The medication should be kept away from children and pets.

Manufactured For:
Accord Healthcare, Inc.,
1009 Slater Road,
Suite 210-B,
Durham, NC 27703,
USA.

Manufactured By:
Intas Pharmaceuticals Limited,
Plot No. : 457, 458,
Village – Matoda,
Bavla Road, Ta.- Sanand,
Dist.- Ahmedabad – 382 210.
India.

10 6947 2 661726

Issued January 2017

Package Label.Principal Display Panel

PRINCIPAL DISPLAY PANEL

Amber Glass Bottles

5 mg : 5 capsules

Carton

PRINCIPAL DISPLAY PANEL - temo 5mg 5cap amber cart

Amber Glass Bottles

20 mg : 5 capsules

Carton

Amber Glass Bottles

100 mg : 5 capsules

Carton

Amber Glass Bottles

140 mg : 5 capsules

Carton

Amber Glass Bottles

180 mg : 5 capsules

Carton

Amber Glass Bottles

250 mg : 5 capsules

Carton