Anzatax

Paclitaxel.

Paclitaxel is an anticancer agent from the taxane class of drugs.
Anzatax Injection Concentrate is a sterile solution containing 6 mg/mL paclitaxel. It is a white powder. Paclitaxel is extremely hydrophobic, and is therefore formulated in PEG 35 castor oil and ethanol.
Excipients with known effect: Ethanol.
Anzatax Injection Concentrate has a pH 6.0 to 7.0.
Molecular weight: 853.9.
Excipients/Inactive Ingredients: Citric acid, PEG-35 castor oil, Ethanol.

Pharmacology: Pharmacodynamics: Mechanism of action: Paclitaxel is an antimicrotubule antineoplastic agent. It promotes microtubule assembly by enhancing the polymerisation of tubulin, the protein subunit of spindle microtubules, even in the absence of the mediators normally required for microtubule assembly (e.g. guanosine triphosphate [GTP]), thereby inducing the formation of stable, nonfunctional microtubules. While the precise mechanism of action of the drug is not completely known, paclitaxel disrupts the dynamic equilibrium within the microtubule system and blocks cells in the late G2 phase and M phase of the cell cycle, inhibiting cell replication and impairing function of nervous tissue.
Clinical trials: No data available.
Pharmacokinetics: Distribution: After paclitaxel is administered intravenously, its plasma concentration declines biphasically.
The first phase shows rapid decline representing distribution of paclitaxel to the peripheral compartment and elimination. This initial phase is followed by a relatively slow elimination of paclitaxel from the peripheral compartment.
Mean steady state volume of distribution following single dose infusion of 135 and 175 mg/m² has ranged from 198 to 688 L/m², indicating extensive extravascular distribution and/or tissue binding.
The serum protein binding of paclitaxel is 89% following a three hour infusion of 175 mg/m² paclitaxel.
Metabolism: The liver is thought to be the primary site of metabolism for paclitaxel.
Excretion: In patients treated with doses of 135 and 175 mg/m² given as 3 and 24 hour infusions, mean terminal half-life has ranged from 3.0 to 52.7 hours and total body clearance has ranged from 11.6 to 24.0 L/hour/m².
Following three hour infusions of 175 mg/m², mean terminal half-life was estimated to be 9.9 hours; mean total body clearance was 12.4 L/hour/m².
The mean cumulative urinary recovery of unchanged paclitaxel has been reported as 1.8 to 12.6% of the dose.

Anzatax Injection Concentrate is indicated for the primary treatment of ovarian cancer in combination with a platinum agent.
Anzatax Injection Concentrate is indicated for the treatment of metastatic ovarian cancer and metastatic breast cancer, after failure of standard therapy.
Anzatax Injection Concentrate is indicated for the treatment of non-small cell lung cancer (NSCLC).
Anzatax Injection Concentrate is indicated for the treatment of metastatic cancer of the breast, in combination with trastuzumab (Herceptin), in patients who have tumours that over-express HER-2 at 3+ level as determined by immunohistochemistry and who have not received previous chemotherapy for their metastatic disease.

Dosage: All patients should be premedicated before paclitaxel is administered to prevent severe hypersensitivity reactions (see Precautions). Before every treatment cycle, patients should be premedicated with: dexamethasone 20 mg orally 12 hours and 6 hours prior to starting the paclitaxel infusion; promethazine 25 mg to 50 mg intravenously or other suitable H₁-antagonist, 30 minutes prior to starting the paclitaxel infusion; cimetidine 300 mg or ranitidine 50 mg by intravenous infusion over 15 minutes, starting 30 minutes prior to the paclitaxel infusion.
For primary treatment of ovarian cancer, it is recommended that paclitaxel be used at a dose of: 175 mg/m², administered intravenously over 3 hours, followed by cisplatin 75 mg/m². The infusion should be repeated every three weeks; 135 mg/m², administered intravenously over 24 hours, followed by cisplatin 75 mg/m². The infusion should be repeated every three weeks.
For the treatment of metastatic ovarian cancer or metastatic breast cancer, it is recommended that paclitaxel be used as a single agent at a dose of 175 mg/m². Paclitaxel should be administered as an intravenous infusion over 3 hours. The infusion should be repeated every 3 weeks as tolerated. Patients have tolerated treatment with up to 9 cycles of paclitaxel therapy, but the optimal course of therapy remains to be established.
For primary or secondary treatment of NSCLC, the recommended dose of paclitaxel is 175 mg/m² administered intravenously over 3 hours with a 3 week interval between courses.
Dosage adjustment: Subsequent doses of paclitaxel should be administered according to individual patient tolerance. Repetition of a course of paclitaxel is not recommended until the patient's neutrophil count is at least 1.5 x 10⁹ cells/L (1,500 cells/mm³) and the platelet count is at least 100 x 10⁹ cells/L (100,000 cells/mm³). If there is severe neutropenia (neutrophil count less than 0.5 x 10⁹ cells/L or severe peripheral neuropathy or severe mucositis during paclitaxel therapy, the dose of paclitaxel in subsequent courses should be reduced by 20% (see Precautions). The incidence of neurotoxicity and the severity of neutropenia increase with dose within a regime.
Hepatic impairment: Inadequate data are available to recommend dosage alterations in patients with mild, moderate and severe hepatic impairments (see Precautions).
Paediatric population: Paclitaxel is not recommended for use in children below 18 years due to lack of data on safety and efficacy.
Filtration: A microporous membrane of 0.22 microns or less in size is recommended as the in-line filter for all infusions of paclitaxel. The IMED 0.2 micron add on filter set composed of polysulfone and the IVEX II 0.2 micron filter composed of cellulose have both been found to be suitable for Anzatax Injection Concentrate.

At present there is no specific treatment for paclitaxel overdosage. In case of overdose, the patient should be closely monitored. Probable consequences of an overdose are mucositis, severe bone marrow suppression and peripheral neurotoxicity and treatment should be supportive.
Overdoses in paediatric patients may be associated with acute ethanol toxicity. Treatment is symptomatic and supportive.

Anzatax Injection Concentrate must not be used in patients who have exhibited hypersensitivity reactions to paclitaxel or other taxanes.
Anzatax Injection Concentrate must not be used in patients who have a history of hypersensitivity reactions to PEG 35 castor oil or drugs formulated in PEG 35 castor oil (e.g. ciclosporin for injection concentrate and teniposide for injection concentrate) or any of the other excipients.
Anzatax Injection Concentrate should not be administered in patients with solid tumours who have a baseline neutrophil counts of <1.5 x 10⁹ cells/L.

General: Paclitaxel should be administered under the supervision of a physician experienced in the use of chemotherapeutic agents. Appropriate management of complications is possible only when adequate diagnostic and treatment facilities are readily available.
Paclitaxel should be given before a platinum compound when it is given in combination with a platinum compound.
Premedication: In order to minimise the possibility of hypersensitivity reactions due to histamine release, patients should be premedicated before every treatment cycle of paclitaxel. Premedication should include corticosteroids (e.g. dexamethasone), antihistamines (e.g. diphenhydramine or promethazine) and an H₂-receptor antagonist (e.g. cimetidine or ranitidine) (see Dosage & Administration). The characteristic symptoms of hypersensitivity reactions are dyspnoea and hypotension both requiring treatment, angioedema and widespread urticaria. Anzatax Injection Concentrate must not be used in patients who have exhibited hypersensitivity reactions to paclitaxel.
Neutropenia (see Adverse Reactions): As the dose limiting toxicity of paclitaxel is dose related bone marrow suppression (primarily neutropenia), paclitaxel should not be administered to patients with a pre-treatment neutrophil count of less than 1.5 x 10⁹ cells/L (1,500 cells/mm³) or platelet count of less than 100 x 10⁹ cells/L. Blood counts should be frequently monitored during treatment with paclitaxel. Further cycles of paclitaxel should not be administered until the patient's neutrophil count is greater than 1.5 x 10⁹ cells/L (1,500 cells/mm³) and the platelet count is greater than 100 x 10⁹ cells/L (100,000 cells/mm³).
If there is severe neutropenia during a course of paclitaxel (i.e. neutrophil count less than 0.5 x 10⁹ cells/L [500 cells/mm³], the dose of paclitaxel in subsequent cycles should be reduced by 20%. Previous radiation therapy may induce more severe myelosuppression. There is little information available from such patients at doses above 135 mg/m².
Cardiovascular toxicity: Hypotension, hypertension and bradycardia have been observed during paclitaxel administration, but generally do not require treatment. Frequent monitoring of vital signs, particular during the first hours of paclitaxel infusion is recommended [see also Adverse Reactions].
Electrocardiographic monitoring is recommended for patients with serious conduction abnormalities and should be commenced for patients who develop abnormal cardiovascular symptoms or signs during monitoring of vital signs.
Severe cardiac conduction abnormalities have been reported rarely during paclitaxel therapy. If patients develop significant conduction abnormalities during paclitaxel administration, appropriate therapy should be administered and continuous electrocardiographic monitoring should be commenced and performed during subsequent therapy with paclitaxel [see also Adverse Reactions]. Severe cardiovascular events were observed more frequently in patients with NSCLC than breast or ovarian cancer.
When paclitaxel is used in combination with trastuzumab or doxorubicin for treatment of metastatic breast cancer, monitoring of cardiac function is recommended. When patients are candidates for treatment with paclitaxel in these combinations, they should undergo baseline cardiac assessment including history, physical examination, ECG, echocardiogram, and/or MUGA scan. Cardiac function should be further monitored during treatment (eg, every 3 months). Monitoring may help to identify patients who develop cardiac dysfunction and treating physicians should carefully assess the cumulative dose (mg/m²) of anthracycline administered when making decisions regarding frequency of ventricular function assessment.
When testing indicates deterioration in cardiac function, even asymptomatic, treating physicians should carefully assess the clinical benefits of further therapy against the potential for producing cardiac damage, including potentially irreversible damage. If further treatment is administered, monitoring of cardiac function should be more frequent (eg, every 1-2 cycles).
Anaphylaxis and severe hypersensitivity reactions: Severe hypersensitivity (anaphylactoid) reactions characterised by dyspnoea and hypotension requiring treatment, angioedema and generalised urticaria have occurred rarely in premedicated patients receiving paclitaxel. Rare fatal reactions have occurred in patients despite pretreatment. Cross-hypersensitivity between Anzatax and other taxane products has been reported and may include severe reactions such as anaphylaxis. Patients with a previous history of hypersensitivity to other taxanes should be closely monitored during initiation of ANZATAX therapy.
Since significant hypersensitivity reactions may occur, appropriate supportive equipment should be available. Patients receiving paclitaxel should be under continuous observation for at least the first 30 mins following the start of the infusion and frequently thereafter. In case of a severe hypersensitivity reaction, paclitaxel infusion should be discontinued immediately and appropriate treatment given as indicated for anaphylaxis. The patient should not be rechallenged with the drug. Minor hypersensitivity reactions such as flushing, skin reactions, etc. do not require interruption of therapy [see Adverse Reactions].
Gastrointestinal: In patients receiving paclitaxel who complain of abdominal pain with other signs and symptoms, bowel perforation should be excluded.
Administration: Anzatax Injection Concentrate is administered by intravenous infusion only; it must not be administered by the intracerebral, intrapleural or intraperitoneal routes. Anzatax Injection Concentrate must be diluted before intravenous infusion. Prior to intravenous infusion of paclitaxel, it must be ensured that the indwelling catheter is in the correct position as extravasation, necrosis and/or thrombophlebitis may result with incorrect administration (see Dosage & Administration).
Patients receiving paclitaxel should be under continuous observation for at least the first 30 minutes following the start of the infusion and frequently thereafter. In case of a severe hypersensitivity reaction, paclitaxel infusion should be discontinued immediately and appropriate treatment given as indicated for anaphylaxis. The patient should not be rechallenged with the drug. Minor hypersensitivity reactions such as flushing, skin reactions, etc. do not require interruption of therapy (see also Adverse Reactions).
In some patients, temporary discontinuation of the infusion is sufficient to resolve the symptoms. Other patients may require therapy with bronchodilators, adrenaline, antihistamines and corticosteroids, either alone or in combination.
Injection site reaction: A specific treatment for extravasation reaction is unknown at this time. Given the possibility of extravasation, it is advisable to closely monitor the infusion site for possible infiltration during drug administration.
Nervous system: Patients with pre-existing neuropathy should be carefully monitored. Peripheral neuropathy is frequently reported in patients receiving paclitaxel and the severity is dose dependent. A 20% reduction in paclitaxel dose is recommended for patients who develop peripheral neuropathy during therapy [see Adverse Reactions].
In NSCLC patients, the administration of paclitaxel in combination with cisplatin resulted in a greater incidence of neurotoxicity than usually seen in patients receiving single agent paclitaxel.
Paclitaxel contains ethanol, 396 mg/mL; consideration should be given to possible CNS and other effects of alcohol.
Children may be more sensitive than adults to the effects of ethanol.
Interstitial pneumonia: Paclitaxel in combination with radiation of the lung, irrespective of their chronological order, may contribute to the development of interstitial pneumonia.
Pseudomembranous colitis: Pseudomembranous colitis has been reported in patients who have not been concomitantly treated with antibiotics. This reaction should be considered in the differential diagnosis of cases of severe or persistent diarrhoea occurring during or shortly after treatment with paclitaxel.
Mucositis: Severe mucositis has been reported which requires dose reduction (see Dosage & Administration).
Ophthalmology: There have been reports of reduced visual acuity due to cystoid macular oedema (CMO) during treatment with paclitaxel as well as with other taxanes [see Adverse Reactions]. Patients with visual impairment during paclitaxel treatment should seek a prompt and complete ophthalmologic examination. Paclitaxel should be discontinued if a CMO diagnosis is confirmed.
Effects on laboratory tests: No data available.
Effects on ability to drive and use machine: The effect of paclitaxel on the ability to drive or use machines has not been systematically evaluated. Patients should refrain from driving or using machines until they know that paclitaxel does not negatively affect these abilities. It should be noted that paclitaxel contains ethanol.
Use in hepatic impairment: The effect of hepatic impairment on the pharmacokinetics of paclitaxel has not been established. However, as the liver is thought to be the primary site for metabolism of the drug, paclitaxel should be given cautiously to patients with decreased liver function. Paclitaxel has been shown to cause a dose related elevation of liver enzymes.
When paclitaxel is given as a 24 hour infusion to patients with moderate to severe hepatic impairment, increased myelosuppression may be seen as compared to patients with mildly elevated liver function tests given 24 hour infusions.
Use in renal impairment: The effect of renal impairment on the pharmacokinetics of paclitaxel has not been established.
Use in Children: The safety and effectiveness of Anzatax Injection Concentrate in children has not been established. Central nervous system (CNS) toxicity (rarely associated with death) has been associated with administration of higher doses (350 mg/m² to 420 mg/m²) in paediatric patients. The toxicity is most likely attributable to the high dose of the ethanol component of the paclitaxel vehicle given over a short infusion time. The use of concomitant antihistamines may intensify this effect. A direct effect of paclitaxel itself cannot be discounted. The risk associated with the use of high doses in paediatric patients must be considered in assessing the safety of paclitaxel for use in this population.
Use in the Elderly: It is reported that severe myelosuppression, severe neuropathy and cardiovascular events are observed more frequently in elderly patients. Efficacy appears to be similar in elderly patients and in younger patients; however comparative efficacy cannot be determined with confidence due to the small number of elderly patients studied. In one report of first line treatment in ovarian cancer, elderly patients had a lower median survival than younger patients, but no other efficacy parameters favoured the younger group.

Effects on fertility: Following treatment with intravenous paclitaxel at a dose of 1 mg/kg (6 mg/m²), rats showed decreased fertility and toxicity in unborn offspring. Paclitaxel administered intravenously to rabbits during organogenesis at a dose of 3 mg/kg (33 mg/m²) was toxic to both mother and foetus.
Infertility in females and males: Based on findings in animal studies, ANZATAX may impair fertility in females and males of reproductive potential.
Use in pregnancy (Category D¹): Paclitaxel is a cytotoxic agent that can produce spontaneous abortion, foetal loss and birth defects and may cause foetal harm when administered to a pregnant woman. Studies have shown paclitaxel to be toxic to embryos and foetuses in rabbits at an intravenous dose of 3 mg/kg (33 mg/m²) given during organogenesis. Paclitaxel is toxic to rat foetuses at a dose of 1 mg/kg (6 mg/m²) and produced low fertility and foetal toxicity in rats. Examination revealed that no gross external, soft tissue or skeletal alterations occurred. There are no studies in pregnant women.
Women of childbearing potential should have a pregnancy test prior to starting treatment with ANZATAX. These women should be strongly advised to use effective contraception throughout therapy and for at least six months after the last dose of ANZATAX. If paclitaxel is used during pregnancy, or if the patient becomes pregnant while receiving this drug, the patient should be apprised of the potential hazard.
¹ Category D: Drugs which have caused, are suspected to have caused or may be expected to cause, an increased incidence of human foetal malformations or irreversible damage. These drugs may also have adverse pharmacological effects.
Females and males of reproductive potential: Males: Based on findings in genetic toxicity and animal reproduction studies, males should be advised to use effective contraception in order to avoid fathering a child during treatment and for at least three months after the last dose of ANZATAX.
Females: Women of childbearing potential should be advised to use effective contraception in order to avoid becoming pregnant during treatment and for at least six months after the last dose of ANZATAX.
Use in lactation: It is not known whether paclitaxel is excreted in human milk. The evidence from many drugs would suggest that paclitaxel could be excreted in breast milk, though this is not known. Because infants receiving the drug could experience serious adverse effects, breastfeeding should be discontinued while the mother is undergoing treatment.

The frequency and severity of adverse effects are generally similar between patients receiving paclitaxel for the treatment of ovarian, breast or lung cancer. None of the observed effects appear to be clearly influenced by age. When using alternative dosing regimens, the incidence of adverse reactions may be higher than reported as follows. Unless otherwise mentioned, the combination of paclitaxel with platinum agents did not result in any clinically relevant changes to the safety profile of single agent paclitaxel.
Adverse effects reported were those occurring during or following the first course of therapy, and have, where possible, been grouped by frequency according to the following criteria. Very common; Common; Uncommon; Rare; Very rare.
Cardiovascular: Very common: Hypotension.
Common: Bradycardia; ECG abnormalities (non-specific repolarisation and sinus tachycardia).
Uncommon: ECG abnormalities (premature beats), cardiomyopathy.
Rare: Myocardial infarction; congestive heart failure (typically in patients who have received other chemotherapy, notably anthracyclines).
Six severe cardiovascular events possibly related to paclitaxel administration occurred including asymptomatic ventricular tachycardia, tachycardia with bigeminy, atrioventricular block (2 patients), and syncopal episodes (2 patients - in one associated with severe hypotension and coronary stenosis resulting in death). Severe hypotensive reactions have been associated with serious hypersensitivity reactions and have required intervention. Cardiac failure and sinus bradycardia have also been observed.
Haematological: Very common: Myelosuppression, thrombocytopenia, leucopoenia, fever, bleeding, anaemia; neutropenia. Neutrophil nadirs are reported to occur at a median of 11 days after paclitaxel administration.
Common: Febrile neutropenia (associated with an infectious episode, including UTI and URTI).
Rare: Five septic episodes, which were associated with severe neutropenia attributable to paclitaxel administration had a fatal outcome.
Patients who have received prior radiation or cisplatin therapy exhibit more frequent myelosuppression, which is generally of greater severity (see Precautions and Interactions).
Hepatobiliary: Very common: Elevated alkaline phosphatase; elevated AST; elevated ALT.
Common: Elevated bilirubin.
Rare: Hepatic necrosis (leading to death); hepatic encephalopathy (leading to death).
Hypersensitivity: Very common: Flushing; rash.
Common: Dyspnoea; hypotension; chest pains; tachycardia.
Uncommon: Significant hypersensitivity reactions requiring therapy (e.g. Hypotension, angioneurotic oedema, bronchospasm, respiratory distress, generalised urticaria, oedema, backpains, pain in extremities, chills, diaphoresis).
Infections and Infestation: Very common: Infection.
Uncommon: Septic shock.
Gastrointestinal: Very common: Nausea; vomiting; diarrhoea; mucositis (These manifestations were usually mild to moderate at the recommended dose.)
Rare: Bowel perforation (There have been several cases of bowel perforation associated with patients receiving paclitaxel. Patients receiving paclitaxel who complain of abdominal pain with other signs and symptoms, should have bowel perforation excluded).
Neutropenic enterocolitis has been reported.
Vascular Disorders: Very common: Hypotension.
Uncommon: Hypertension, thrombosis, thrombophlebitis.
Musculoskeletal: Very common: Arthralgia; myalgia (The symptoms were usually transient occurring two to three days after paclitaxel administration and resolving within a few days.)
Neurological: Very common: Peripheral neuropathy (The incidence of peripheral neuropathy is dose dependent; neurologic symptoms may occur following the first course and may worsen in a high proportion of patients with increasing exposure. Severity of symptoms also increases with dose. Peripheral neuropathy has been reported as a cause of discontinuation in some patients taking paclitaxel, though sensory symptoms have usually improved or resolved within several months of paclitaxel discontinuation).
Rare: Optic nerve and/or visual disturbances (scintillating scotomata) particularly in patients who have received higher doses than recommended; these effects generally have been reversible; motor neuropathy with resultant minor distal weakness and autonomic neuropathy resulting in paralytic ileus and orthostatic hypotension.
Skin and Appendages: Very common: Alopecia.
Rare: Nail and skin changes (mild and transient); radiation-recall dermatitis; recall dermatitis.
Local: Phlebitis following intravenous administration has been reported. Extravasation leading to oedema, pain, erythema and induration has been reported. On occasions, extravasation can lead to cellulitis. Skin discolouration may also occur.
General Disorders and Administration Site Conditions: Common: Injection site reactions (including localised oedema, pain, erythema, induration, on occasion extravasation can result in cellulitis).
Injection site reactions, including reactions secondary to extravasation, were usually mild and consisted of erythema, tenderness, skin discolouration, or swelling at the injection site. These reactions have been observed more frequently with the 24 hour infusion than with the 3 hour infusion. Recurrence of skin reactions at a site of previous extravasation following administration of paclitaxel at a different site, i.e., 'recall', has been reported rarely.
Rare reports of more severe events such as phlebitis, cellulitis, induration, skin exfoliation, necrosis and fibrosis have been received as part of the continuing surveillance of paclitaxel safety. In some cases the onset of the injection site reaction either occurred during a prolonged infusion or was delayed by a week to ten days.
A specific treatment for extravasation reactions is unknown at this time. Given the possibility of extravasation, it is advisable to closely monitor the infusion site for possible infiltration during drug administration.
Radiation pneumonitis has been reported in patients receiving concurrent radiotherapy.
Post marketing Experience: The following additional adverse reactions have been identified during post approval use of paclitaxel. Because the reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a casual relationship to drug exposure.
Infections and Infestations: Pneumonia, sepsis.
Cardiac Disorders: Atrial fibrillations, supraventricular tachycardia, reduction of left ventricle ejection fraction, ventricular failure.
Haematological Disorders: Acute myeloid leukaemia, myelodysplastic syndrome.
Immune System Disorders: Anaphylactic reactions (with fatal outcome), anaphylactic shock, cross-hypersensitivity between ANZATAX and other taxanes has been reported.
Metabolism and Nutritional Disorders: Anorexia, tumour lysis syndrome.
Psychiatric Disorders: Confusion state.
Vascular Disorders: Shock.
Respiratory, Thoracic and Mediastinal Disorders: Dyspnoea, pleural effusion, respiratory failure, interstitial pneumonia, lung fibrosis, pulmonary embolism, cough.
Gastrointestinal Disorders: Bowel obstruction, bowel perforation, ischemic colitis, pancreatitis, mesenteric thrombosis, pseudomembranous, colitis, oesophagitis, constipation, ascites.
Neurological Disorders: Autonomic neuropathy (resulting in paralytic ileus and orthostatic hypotension), grand mal seizures, convulsions, encephalopathy, dizziness, headache, ataxia, paresthesia, hyperesthesia.
Eye Disorders: Photopsia, visual floaters cystoid macular oedema, macular oedema.
Ear and Labyrinth Disorders: Hearing loss, tinnitus, vertigo, ototoxicity.
Skin and Subcutaneous Tissue Disorders: Stevens-Johnson syndrome, epidermal necrolysis, erythema multiforme, exfoliative dermatitis, urticaria, onycholysis (patients on therapy should wear sun protection on hands and feet), pruritus, rash, erythema, phlebitis, cellulitis, skin exfoliation, necrosis, fibrosis, palmar-plantar erythrodysesthesia syndrome.
Musculoskeletal and Connective Tissue Disorders: Systemic lupus erythematosus, scleroderma.
Investigations: Increase in blood creatinine.
General Disorders and Administration Site Conditions: Asthenia, malaise, pyrexia, dehydration, oedema.

Cisplatin: The recommended regimen of paclitaxel administration for the first line chemotherapy of ovarian carcinoma is for paclitaxel to be given before cisplatin. When paclitaxel is given before cisplatin, the safety profile of paclitaxel is consistent with that reported for single agent use. Administration of cisplatin prior to paclitaxel treatment leads to greater myelosuppression than that seen when paclitaxel is given prior to cisplatin. In patients receiving cisplatin prior to paclitaxel, there is about a 33% decrease in paclitaxel clearance. Patients treated with paclitaxel and cisplatin may have an increased risk of renal failure as compared to cisplatin alone in gynecological cancers.
Doxorubicin: Sequence effects characterised by more profound neutropenic and stomatitis episodes have been observed with combination use of paclitaxel and doxorubicin when paclitaxel was administered before doxorubicin and using longer than recommended infusion times (paclitaxel administered over 24 hours; doxorubicin over 48 hours). Plasma levels of doxorubicin (and its active metabolite doxorubicinol) may be increased when paclitaxel and doxorubicin are used in combination and are given closer in time. Paclitaxel for initial treatment of metastatic breast cancer should be administered 24 hours after doxorubicin (see Dosage & Administration). However, data from a trial using bolus doxorubicin and 3 hour paclitaxel infusion found no sequence effects on the pattern of toxicity.
Cimetidine: Paclitaxel clearance is not affected by cimetidine premedication.
Drugs metabolised in the liver: The metabolism of paclitaxel is catalysed, in part, by cytochrome P450 isoenzymes CYP2C8 and 3A4. Clinical studies have demonstrated that CYP2C8 mediated metabolism of paclitaxel, to 6α-hydroxypaclitaxel, is the major metabolic pathway in humans. Concurrent administration of ketoconazole, a known potent inhibitor of CYP3A4, does not inhibit the elimination of paclitaxel in patients; thus, both medicinal products may be administered together without dosage adjustment. Further data on the potential of drug interactions between paclitaxel and CYP2C8 and 3A4 substrates/inhibitors are limited. Therefore, caution should be exercised when administering paclitaxel concomitantly with medicines known to inhibit (e.g., erythromycin, fluoxetine, gemfibrozil, deferasirox, trimethoprim) or induce (e.g., rifampicin, carbamazepine, phenytoin, phenobarbital, efavirenz, nevirapine, St John's wort) either CYP2C8 or 3A4.
When paclitaxel was used in combination with trastuzumab (Herceptin), mean serum trough concentrations of trastuzumab were consistently elevated 1.5 fold as compared with serum concentrations of trastuzumab in combination with anthracycline plus cyclophosphamide (AC).
Arthralgia or myalgia adverse events of paclitaxel appear to be of a higher incidence in patients being treated concurrently with filgrastim (granulocyte colony stimulating factor; G-CSF).

Instructions for Use: Dilution: Anzatax Injection Concentrate MUST BE DILUTED PRIOR TO INTRAVENOUS INFUSION. It should be diluted in 5% glucose or 0.9% sodium chloride intravenous infusion.
Dilution should be made to a final concentration of 0.3 to 1.2 mg/mL.
After the final dilution of Anzatax Injection Concentrate, the bottle should be swirled gently to disperse the paclitaxel. DO NOT SHAKE.
Avoid contact of paclitaxel solutions with plasticised polyvinyl chloride (PVC) equipment, infusion lines or devices used when preparing infusion solutions. Prepare and store diluted paclitaxel solutions in glass bottles or non-PVC infusion bags. These precautions are to avoid leaching of the plasticiser DEHP (di-[2-ethylhexyl] phthalate) from PVC infusion bags or sets.
Paclitaxel solutions should be administered through polyethylene lined administration sets (e.g. Gemini 20 giving set), using an IMED pump.
Although solutions of paclitaxel for infusion prepared as outlined previously are chemically stable for 3 days at room temperature (25°C) and 14 days at 2°C to 8°C, it is recommended that the solution for infusion should be administered immediately after preparation as it does not contain an antimicrobial agent. The infusion should be completed within 24 hours of preparation of the solution and any residue discarded, according to the guidelines for the disposal of cytotoxic drugs (see Handling and Disposal as follows). Use in one patient on one occasion only.
Compounding centres which have validated aseptic procedure and regular monitoring of aseptic technique may apply the following shelf lives when stored under the specified conditions: (see table.)

Click on icon to see table/diagram/image

Solutions prepared this way have been shown to be chemically stable for these periods.
Administration should be completed within 24 hours of the start of the infusion and any residue discarded according to the guidelines for the disposal of cytotoxic drugs. Do not use paclitaxel if any precipitation forms or if the diluted solution appears cloudy.
Incompatibilities: PEG 35 Castor Oil can result in di-(2-ethylhexyl) phthalate [DEHP] leaching from plasticized polyvinyl chloride (PVC) containers, at levels which increase with time and concentration.
Consequently, the preparation, storage, and administration of paclitaxel should be carried out in non-PVC containing equipment such as glass, polypropylene, or polyolefin.
Special precautions for disposal: Handling and Disposal: The published guidelines related to procedures for the proper handling and disposal of cytotoxic drugs should be followed.
Care must be taken whenever handling cytostatic products. Always take steps to prevent exposure. This included appropriate equipment, such as wearing gloves and washing hands with soap and water after handling such products.
Paclitaxel is a cytotoxic anticancer drug and as with other potentially toxic compounds, caution should be exercised in handling paclitaxel. The use of gloves is recommended. Following topical exposure, tingling, burning, redness have been observed. If paclitaxel solution contacts the skin, wash the skin immediately and thoroughly with soap and water. If paclitaxel contacts mucous membranes, the membranes should be flushed thoroughly with water. Upon inhalation, dyspnoea, chest pain, burning eyes, sore throat and nausea have been reported. Given the possibility of extravasation, it is advisable to closely monitor the infusion site for possible infiltration during drug administration.

Store below 25°C. Protect from light.

Cytotoxic Chemotherapy

L01CD01 - paclitaxel ; Belongs to the class of taxanes from plant alkaloids and other natural products. Used in the treatment of cancer.

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