Cyclophosphamide

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Uses 

  • Cytotoxic
    • Primary
      • *Breast cancer

      • Conditioning regimen for stem cell transplant

      • Ewing’s sarcoma
      • *Leukemia, acute myelogenous

      • *Leukemia, chronic lymphocytic

      • *Leukemia, chronic myelogenous 

      • *Leukemia, pediatric acute lymphoblastic

      • *Lung cancer

      • *Lymphoma, Burkitt’s 
      • *Lymphoma, Hodgkin’s disease
      • *Lymphoma, non-Hodgkin’s
      • Lymphoproliferative disease

      • *Multiple myeloma

      • *Mycosis fungoides

      • *Neuroblastoma

      • *Ovarian cancer

      • *Retinoblastoma

      • Rhabdomyosarcoma

    • Secondary
      • Wilm's Tumour
      • Waldenstrom's macroglobulinaemia
      • Thymoma
      • Testicular Cancer
      • Soft Tissue Sarcoma
      • Osteosarcoma
      • Cutaneous T-cell Lymphoma
      • Acute lymphocytic leukaemia
      • Gestational trophoblastic neoplasia
      • Endometrial Cancer
      • Cervical Cancer
      • Brain Cancer
      • Bladder Cancer
  • Immunosuppresant
    • as for azothioprine (transplant rejection/ immunosuppression)+
      1. treatment of nephritic syndrome with minimal changes in glomeruli esp. those sensitive to glucocorticoids
      2. treatment of nephritis due to SLE, Wegner’s granulomatosis, (severe RA)

Dose

  • 3 mg/kg/day p.o.

Mechanism:

  • Activated by hepatic P-450 mixed function oxidases to phosphoramide mustard (cytotoxic) and acrolein (causes renal damage).
  • Alkylates DNA
  • Cytotoxic effects due to cross-linkng of DNA/RNA and inhibition of protein synthesis
  • As immunosuppressant:
    • Inhibits lymphocyte proliferation by alkylating DNA
      •  more effective after antigen stimulation.
    • ↓ B-cell AB production → ↓ T-cell mediated immunity

Adverse effects

  • Nausea + vomiting
  • Haemorrhagic cystitis (prevent by increasing fluid intake + sulphydryl donor e.g. N-acetylcysteine or mesna)

USES:

*Health Canada approved indication

SPECIAL PRECAUTIONS:

Contraindicated in patients who have a history of hypersensitivity reaction to cyclophosphamide.3 There is possible

cross-sensitivity with other alkylating agents.1

Carcinogenicity: Secondary malignancies have developed in patients treated with cyclophosphamide alone or in

combination with other antineoplastics. Occurring most frequently are bladder, myeloproliferative and

lymphoproliferative malignancies. Secondary malignancies are most common in patients treated initially for

myeloproliferative or lymphoproliferative diseases or for non-malignant conditions with immune pathology. Urinary

bladder malignancies are most common in patients who experienced hemorrhagic cystitis.

Mutagenicity: Because of the mutagenic potential of cyclophosphamide, adequate methods of contraception should

be used by patients (both male and female) during and at least four months after treatment.1

Fertility: Gonadal suppression may occur and sterility can be irreversible in some patients.3 Age and duration of

chemotherapy are the main factors contributing to ovarian failure.14 For example, treatment with cyclophosphamide,

methotrexate and fluorouracil for six months results in permanent ovarian failure in 70 percent of women over 40

years of age and in 40 percent of younger women. The median time to onset of ovarian failure is shorter in older

women than in younger women (2-4 months vs. 6-16 months), and ovarian failure is less likely to be reversible in

older women (in about 10 percent vs. up to 50 percent). The rate of permanent ovarian failure is lower with regimens

of doxorubicin and cyclophosphamide than with cyclophosphamide, methotrexate and fluorouracil.

Heart disease: Caution should be used when treating patients with cyclophosphamide who have pre-existing heart

disease.7

Pregnancy: FDA Pregnancy Category D.3 There is positive evidence of human fetal risk, but the benefits from use

in pregnant women may be acceptable despite the risk (e.g., if the drug is needed in a life-threatening situation or for

a serious disease for which safer drugs cannot be used or are ineffective).

Breastfeeding should be terminated prior to initiating cyclophosphamide therapy as this drug is excreted in breast

milk.1

Cyclophosphamide

BC Cancer Agency Cancer Drug Manual© Page 3 of 14 Cyclophosphamide

Developed: September 1994

Revised: September 2005

SIDE EFFECTS:

The table includes adverse events that presented during drug treatment but may not necessarily have a causal

relationship with the drug. Because clinical trials are conducted under very specific conditions, the adverse event

rates observed may not reflect the rates observed in clinical practice. Adverse events are generally included if they

were reported in more than 1% of patients in the product monograph or pivotal trials, and/or determined to be

clinically important.15

ORGAN SITE SIDE EFFECT ONSET

Clinically important side effects are in bold, italics

I = immediate (onset in hours to days); E = early (days to weeks);

D = delayed (weeks to months); L = late (months to years)

allergy/immunology anaphylactic reaction16 (<1%) I

nasal congestion when IV doses are administered too rapidly (large

doses via 30-60 minute infusion);16 patients experience runny eyes,

rhinorrhea, sinus congestion, and sneezing immediately after

infusion.16 (1-10%)

I

anemia E

methemoglobinemia with bone marrow transplant (BMT) doses16 E

myelosuppression; WBC nadir 8-15 days, platelet nadir 10-15

days, recovery 17-28 days

E

blood/bone marrow/

febrile neutropenia

thrombocytopenia E

cardiovascular cardiac dysfunction in high-dose (<1%);16 high-dose can be

defined as 60 mg/kg daily or 120-270 mg/kg over a few days;12

manifests as CHF; cardiac necrosis or hemorrhagic

myocarditis; pericardial tamponade (BMT doses)16

E

coagulation hypoprothrombinemia, risk of bleeding (very rare) E

constitutional symptoms asthenia or sweating (0.1-1%) E

dizziness16 (<1%) E

extravasation hazard: none17

alopecia8,16 (40-60%); begins 3-6 weeks after start of therapy E

facial flushing following IV administration3,16 (1-10%) I

hyperpigmentation (skin and nails)3,16 (<1%) E

rash, hives or itching3,16 (1-5%) I

redness, swelling, or pain at injection site3,16 I

dermatology/skin

toxic epidermal necrolysis16 (<1%) E

endocrine hyperglycemia3 E

emetogenic potential18: >1g high moderate; <1g low moderate

anorexia (33%) E

diarrhea16 (>10%) E

hemorrhagic colitis16 (<1%) E

mucositis16 (>10%) E

gastrointestinal

myxedema or sore lips3 (0.1-11%) E

Cyclophosphamide

BC Cancer Agency Cancer Drug Manual© Page 4 of 14 Cyclophosphamide

Developed: September 1994

Revised: September 2005

ORGAN SITE SIDE EFFECT ONSET

Clinically important side effects are in bold, italics

I = immediate (onset in hours to days); E = early (days to weeks);

D = delayed (weeks to months); L = late (months to years)

nausea and vomiting is dose-related16: > 90% for >1500 mg/m2,

60-90% for 750-1500 mg/m2, 30-60% for < 750 mg/m2 or oral;

usually beginning 6-10 hours after administration

I

stomatitis3,16 (>10%) E

hepatic hepatotoxicity16 (<1%) E

jaundice16 (<1%) E

hyperkalemia, usually in context of tumour lysis16 (<1%) E

hyperuricemia with high-dose and/or long-term therapy16 (<1%) E

metabolic/laboratory

syndrome of inappropriate antidiuretic hormone (SIADH) causing

hyponatremia

E

pain headache3,16 (1-10%) I

interstitial pulmonary fibrosis, with high-dose and/or long-term

therapy16 (<1%)

pulmonary D

pneumonitis, with high-dose and/or long-term therapy16 (<1%) E

non-hemorrhagic cystitis7 E

hemorrhagic cystitis (up to 40%);16 with high-dose and/or long

term therapy3; severe, potentially fatal

E

renal tubular necrosis16 (1-5%) E

renal/genitourinary

hemorrhagic ureteritis (<1%) E

secondary malignancy urinary bladder, myeloproliferative or lymphoproliferative

malignancies16 (<1%)

L

sexual/reproductive

function

interferes with oogenesis and spermatogenesis16 (>10%); may be

irreversible in some patients; gonadal suppression (amenorrhea)3

E

syndromes syndrome of inappropriate antidiuretic hormone (SIADH) secretion

with high-dose and/or long-term therapy3,16 (1-5%)

E

Adapted from standard reference1,12 unless specified otherwise.

Cardiac toxicity may occur in patients receiving high-dose cyclophosphamide. High-dose can be defined as 60

mg/kg daily or 120-270 mg/kg over a few days.12 Other risk factors for developing cardiac toxicity include previous

chest or mediastinal radiotherapy, anthracycline administration, concomitant administration of chemotherapy drugs

which are not normally considered cardiotoxic, especially carmustine, cytarabine and 6-thioguanine,5 and by the

presence of left ventricular dysfunction (ejection fraction less than 50%).19 The mechanism may involve direct injury

to the endothelium by phosphoramide mustard, an active metabolite of cyclophosphamide.19,20Unlike anthracyclines,

cyclophosphamide-induced cardiotoxicity does not appear to be cumulative.5,19,21 In contrast to anthracyclineinduced

cardiomyopathy which occurs months to years after cumulative doses of anthracyclines,

cyclophosphamide-induced cardiotoxicity occurs much earlier.20 Toxicity has ranged from minor, transient ECG

changes and asymptomatic elevation of cardiac enzymes at a total dose of 100 mg/kg to fatal myocarditis and

myocardial necrosis at total doses ranging upwards from 144 mg/kg delivered over 4 days.5 Clinical signs include

dyspnea, tachypnea, fluid retention, increased systemic venous pressure and shock.22 Patients may experience

heart failure, arrhythmias, irreversible cardiomyopathy, pericarditis or death as a result of cardiotoxicity.22 Treatment

is supportive.5

Cyclophosphamide

BC Cancer Agency Cancer Drug Manual© Page 5 of 14 Cyclophosphamide

Developed: September 1994

Revised: September 2005

Hemorrhagic cystitis may occur in up to 40% of patients (especially children) on long term or high dose

cyclophosphamide therapy.7,12 Other risk factors for developing hemorrhagic cystitis include rate of infusion, and rate

of metabolism of cyclophosphamide, as well as the hydration status, urine output, frequency of urination, and

concurrent exposure to other urotoxic drugs or genitourinary radiotherapy.23 The mechanism may involve direct

injury to the urothelium by acrolein, an active metabolite of cyclophosphamide.11 Hemorrhagic cystitis can develop

within a few hours or be delayed several weeks.3 Clinical diagnosis includes non-specific symptoms such as

hematuria, dysuria, urgency and increased frequency of urination and can be confirmed using cystoscopy.23 Severe

hemorrhagic cystitis can lead to constriction of the bladder, anemia, recurrent urinary tract infection, bladder

perforation, renal failure and death.23 Long term complications include bladder fibrosis and contraction, urinary reflux

and transitional cell bladder tumours. Non-hemorrhagic cystitis, edema of the bladder and suburethral bleeding can

also occur.7

Prophylactic measures include encouraging patients to drink plenty of fluids during therapy (most adults will require

at least 2 L/day), to void frequently, and to avoid taking the drug at night.16 Patients should be well hydrated before

and for 24-72 hours following treatment.23 As well, cyclophosphamide should be administered as early in the day as

possible to decrease the amount of drug remaining in the bladder overnight.3 With large IV doses, IV hydration is

usually recommended.16 The use of mesna and/or continuous bladder irrigation is rarely needed for doses <2g/m2.16

However, mesna has been used in patients receiving cyclophosphamide for immunologically mediated disorders

(e.g., Wegener’s granulomatosis, systemic lupus erythromatosus, dermatomyositis, polyarteritis).12 Further

measures to reduce the incidence of cystitis include catheter bladder drainage, bladder irrigation, intravenous

hydration with diuresis, hyperhydration, and the administration of mesna. Hyperhydration is generally not

recommended as it places the patient at risk for fluid overload and electrolyte imbalance, particularly given the

antidiuretic effect of cyclophosphamide.23 Diuretics may be indicated if urine production declines to <100 mL/m2/h. It

appears that mesna and hyperhydration are equally effective in preventing cyclophosphamide-induced cystitis in the

BMT population.

Treatment of hemorrhagic cystitis12,23 begins with discontinuation of cyclophosphamide. Fluid intake should be

increased and the platelet count should be maintained at >50 000/mm3 to minimize the extent of bleeding. There is

several treatment options currently advocated, depending on the severity of bleeding.

Treatment of early cystitis24:

The first line therapy is to administer hyperhydration. Standard hyperhydration may consist of NS or 1/2 NS

at a rate of 3.0 L/m2 per 24-hour period. Depending on the patient’s electrolyte status, KCl and MgS04 are

generally added to the fluid at concentrations 20-40 mEq/L and 2-4 g/L respectively. Patients who have

visible clots in the urine, or have bladder spasms should receive continuous bladder irrigation. Treatment is

generally continued for 48 hours after the urine returns to normal colour and the symptoms have resolved.

The second line therapy is to initiate a bladder irrigation with Alum (aluminum potassium sulphate) which is

prepared by pharmacy as a 1% solution for intravesical administration. This is instilled at a rate of 300-1000

mL/hour and the rate is adjusted to maintain clear pink drainage. Responses to Alum are improved

following removal of clots in the bladder using either cystoscopy or irrigation prior to therapy. As Alum

contains significant amounts of aluminum, aluminum levels should be taken in patients with renal

impairment, or in patients requiring prolonged therapy.

The third line therapy is with prostaglandin (carboprost) which is thought to stimulate platelet aggregation

and cause local vasoconstriction. The dose is generally 0.8-1.0 mg/dL in 50 mL NS (400-500 mcg) instilled

into the bladder; clamp catheter and allow solution to dwell for 60 minutes; repeat every six hours until

response.24 Like Alum, this therapy works best when the bladder is evacuated of clots before starting.

Patients who respond will do so by 5-7 days. Carboprost can cause intense bladder spasm and this can be

a major problem. Therapy with oxybutinin, Belladonna and opium suppositories or systemic narcotic

analgesics may be necessary. In rare cases hemorrhagic cystitis is resistant to the above treatments and

bladder fulguration with formalin or other chemicals is needed.

Treatment of late onset cystitis24:

Many of these cases are due to secondary viral infection or bacterial infection of the injured mucosa. Culture for

bacterial pathogens, cytomegalovirus (CMV) and adenovirus should be done before starting therapy. Primary

therapy is hyperhydration possibly with bladder irrigation. Patient may be need to be treated if pathogen is found i.e.

ganciclovir or foscarnet for CMV, ribaviron for adenovirus, antibiotics for bacterial infections.

Cyclophosphamide

BC Cancer Agency Cancer Drug Manual© Page 6 of 14 Cyclophosphamide

Developed: September 1994

Revised: September 2005

Immunogenicity: Positive reactions to skin test antigens (e.g., tuberculin purified protein derivative, trichophyton,

candida) are frequently suppressed in patients receiving cyclophosphamide.12

Hyperuricemia may result from cell lysis by cytotoxic chemotherapy and may lead to electrolyte disturbances or

acute renal failure.25 It is most likely with highly proliferative tumours of massive burden, such as leukemias, highgrade

lymphomas and myeloproliferative diseases. The risk may be increased in patients with preexisting renal

dysfunction, especially ureteral obstruction. Suggested prophylactic treatment for high-risk patients24:

aggressive hydration: 3 L/m2/24 hr with target urine output > 100 mL/hr

if possible, discontinuation of drugs that cause hyperuricemia (e.g., thiazide diuretics) or acidic urine (e.g.,

salicylates)

monitoring of electrolytes, calcium, phosphate, renal function, LDH and uric acid q6h x 24-48 hours

electrolyte replacement as required

allopurinol 600 mg po initially, then 300 mg po q6h x 6 doses, then 300 mg po daily x 5-7 days

Urine should be alkalinized only if the uric acid level is elevated, using sodium bicarbonate IV or PO titrated to

maintain urine pH > 7. Rasburicase (Fasturtec®) is a novel uricolytic agent that catalyzes the oxidation of uric acid

to a water-soluble metabolite, removing the need for alkalinization of the urine.26 It may be used for treatment or

prophylaxis of hyperuricemia, 0.2 mg/kg IV daily for up to 7 days; however, its place in therapy has not yet been

established.

Interstitial pulmonary fibrosis12,27 may occur in patients receiving high doses of cyclophosphamide over prolonged

periods. Other risk factors include exposure to other drugs with pulmonary toxicities and pulmonary radiotherapy.

The mechanism may involve direct injury to the pulmonary epithelium by cyclophosphamide metabolites.27 In some

cases discontinuation of the drug and initiating corticosteroid therapy fails to reverse this condition, which can be

fatal. Signs and symptoms typically include tachycardia, dyspnea, fever, non-productive cough, basilar crepitant

rales, interstitial bilateral infiltrates on chest x-ray, hypoxemia and ventilation/perfusion dysfunction. Interstitial

pneumonitis has also been reported in patients receiving cyclophosphamide. The drug should be stopped at the first

sign of pulmonary toxicity; all other possible causes of pneumonitis should be ruled out.

Nasal stuffiness or facial discomfort may occur. This nasopharyngeal discomfort “wasabi nose” may be

associated with rapid injection of cyclophosphamide.28-30 This reaction may be caused by a mucosal inflammatory

response or possibly a cholinergic mechanism.31 If troublesome for the patient, several interventions have been

used31: the slowing down of the infusion rate or giving as an intermittent infusion rather than as an IV bolus, the use

of analgesics, decongestants, antihistamines, intranasal beclomethasone, or intranasal ipratropium.

Radiation recall reactions3: Cyclophosphamide has the potential to enhance radiation injury to tissues; this is a

rare side effect. While often called radiation recall reactions, the timing of the radiation may be before, concurrent

with, or even after the administration of the cyclophosphamide. Recurrent injury to a previously radiated site may

occur weeks to months following the radiation.

SIADH (syndrome of inappropriate secretion of ADH)1 may occur in patients receiving cyclophosphamide,

resulting in hyponatremia, dizziness, confusion or agitation, unusual tiredness or weakness. This syndrome is more

common with doses >50 mg/kg and may be aggravated by administration of large volumes of fluids to prevent

hemorrhagic cystitis.9 The condition is self-limiting although diuretic therapy may be helpful in the situation when the

patient has stopped urinating (especially if this occurs during the first 24 hours of cyclophosphamide therapy).

Susceptible patients should be monitored for cardiac decompensation. If weight gain is excessive (1.5-2 kg) during

hydration, the volume of IV fluid should be reduced.

Secondary malignancies1 have developed in some patients, often several years after administration. The most

frequently reported neoplasms are urinary bladder cancer, non-lymphocytic leukemia and non-Hodgkin's lymphoma.

Urinary bladder malignancies generally have occurred in patients who previously had hemorrhagic cystitis.7

Water retention and dilutional hyponatremia: Administration of cyclophosphamide in doses higher than 30-40

mg/kg has been associated with water retention and dilutional hyponatremia.9,12 Children may be especially

susceptible. The mechanism is related to direct injury to the distal renal tubules and collecting ducts by

cyclophosphamide metabolites. Symptoms include decreased urine flow, decreased serum osmolarity and sodium

and increased urine osmolarity. These can occur 4 to 12 hours after cyclophosphamide and resolve within 20 to 24

hours after therapy.

Cyclophosphamide

BC Cancer Agency Cancer Drug Manual© Page 7 of 14 Cyclophosphamide

Developed: September 1994

Revised: September 2005

INTERACTIONS:

AGENT EFFECT MECHANISM MANAGEMENT

allopurinol delayed, moderate;

increased

myelosuppressive effects

of cyclophosphamide is

possible

unknown frequent monitoring with a

complete blood count may

be required

amiodarone32 increased risk of

pulmonary fibrosis

unknown, possibly additive

effect

avoid combination if

possible; otherwise

increase monitoring

chloramphenicol delayed, moderate;

decrease or delay in

activation of

cyclophosphamide

inhibition (weak) of the

CYP2C8/9 and CYP3A4

enzymes by

chloramphenicol16,33

standard monitoring

procedures for both drugs

ciprofloxacin34 delayed, moderate;

decreased antimicrobial

effect of quinolone

antibiotics is possible

decreased quinolone

absorption by altering the

intestinal mucosa

ciprofloxacin can be used

as a prophylactic antibiotic

in cyclophosphamide

based regimens.35

consider monitoring

ciprofloxacin therapy.

corticosteroids decreased or increased

effect of

cyclophosphamide

induction (weak) of the

CYP3A4 enzyme by

corticosteroids16,36-38

clinical significance of this

interaction is unlikely

based on evidence

available; observe for

altered effect of

cyclophosphamide.

digoxin delayed, moderate;

reduced serum levels of

digoxin is suspected

drug-induced alterations of

the intestinal mucosa may

be involved

monitoring for reduced

digoxin effect

grapefruit juice39 delayed, moderate;

decreased or delayed

activation of

cyclophosphamide

inhibition (moderate) of the

CYP3A4 enzyme16,40 by

grapefruit juice

avoid grapefruit juice for

48 hours before and on

day of dose

hydrochlorthiazide delayed, moderate;

prolonged leucopenia is

possible

unknown avoid concurrent use;

consider alternative

antihypertensive therapy

indapamide delayed, moderate;

prolonged leucopenia is

possible

unknown avoid concurrent use;

consider alternative

antihypertensive therapy

indomethacin7 4 cases of severe

pulmonary edema and

acute life-threatening

water intoxication

unknown avoid concurrent use

phenytoin10, phenobarbital,

rifampin and other drugs

which induce CYP2B641

increased rate at which

cyclophosphamide is

converted to active and

toxic metabolites and

possibly to inactive

metabolites

induction (strong) of the

CYP2B6 enyzme16,41 by

phenytoin, phenobarbital

and rifampin.

clinical significance of this

interaction is unknown;

observe for altered effect

of cyclophosphamide

Cyclophosphamide

BC Cancer Agency Cancer Drug Manual© Page 8 of 14 Cyclophosphamide

Developed: September 1994

Revised: September 2005

AGENT EFFECT MECHANISM MANAGEMENT

succinylcholine rapid, moderate;

prolonged neuromuscular

blockade produced by

succinylcholine is probable

cyclophosphamide inhibits

plasma cholinesterase

resulting in decreased

metabolism of

succinylcholine

consider reducing

succinylcholine based on

measured plasma

cholinesterase levels

warfarin delayed, moderate;

increased anticoagulant

effect of warfarin

suspected

inhibition of warfarin

metabolism, or clotting

factor synthesis

monitoring coagulation

parameters during and

after chemotherapy; adjust

warfarin dose as needed

Adapted from standard reference34 unless specified otherwise.

SUPPLY AND STORAGE:

Tablets7: Store at room temperature.

Cytoxan® available as 25 mg and 50 mg white tablets with blue flecks.

Procytox® available as 25 mg and 50 mg white to off-white, sugar-coated tablet.

Injection7: Store at room temperature.

Cytoxan® available as a non-lyophilized formulation manufactured by Bristol-Myers Squibb;1 available in single-use

vials of 1000 mg and 2000 mg. Contains no preservative. Protect from light.

Procytox® available as a non-lyophilized formulation42 manufactured by Baxter; available in 200 mg, 500 mg, 1000

mg and 2000 mg vials. Contains no preservative. Protect from light.

SOLUTION PREPARATION AND COMPATIBILITY:

Reconstitute powder7: to give a final concentration of 20 mg/mL.

Cytoxan® is reconstituted with sterile NS for direct IV, and with SWI for parenteral injection.1 For 1 g vial add 50 mL

diluent and for 2 g vial add 100 mL diluent. Add the diluent to the vial and shake it vigorously to dissolve. If the

powder fails to dissolve immediately and completely, let the vial stand for a few minutes. Heat should not be used.

Procytox® is reconstituted with sterile NS. Shake the vial until dissolution and a clear solution is obtained. It may

take several hours for complete dissolution.42 For 200 mg vial add 10 mL NS, for 500 mg vial add 25 mL, for 1000

mg add 50 mL and for 2000 mg add 100 mL.

Reconstituted solution for injection7:

Cytoxan® once reconstituted, is chemically and physically stable for 24 hours at room temperature or for 6 days in

the refrigerator1

Procytox® once reconstituted, is chemically stable for 24 hours at room temperature or 72 hours refrigerated.

Diluted solution for infusion7:

Cytoxan®1 can be further diluted in D5W, D5NS, D5 with Ringer’s injection, Lactated Ringer’s Injection, 0.45% NS,

Sodium Lactate Injection and NS.43 Diluted solutions are chemically and physically stable for 24 hours at room

temperature or for 6 days in the refrigerator.44,45

Procytox® can be further diluted in D5NS, D5W and NS. Diluted solutions are chemically stable for 24 hours at room

temperature, or 72 hours refrigerated.

Bacterial challenge: Diluted solutions should be stored under refrigeration whenever possible, and the potential for

microbiological growth should be considered when assigning expiration periods.

Compatibility46: The following are compatible via Y-site injection: amifostine, bleomycin, chlorpromazine,

cimetidine, cisplatin, cladribine, dexamethasone, diphenhydramine, doxorubicin, liposomal doxorubicin, droperidol,

etoposide, fludarabine, fluorouracil, furosemide, gemcitabine, granisetron, heparin, hydromorphone, idarubicin,

leucovorin, lorazepam, melphalan, methotrexate, methylprednisolone, metoclopramide, mitomycin, ondansetron,

Cyclophosphamide

BC Cancer Agency Cancer Drug Manual© Page 9 of 14 Cyclophosphamide

Developed: September 1994

Revised: September 2005

paclitaxel, prochlorperazine, promethazine, propofol, ranitidine, sodium bicarbonate, thiotepa, vinblastine, vincristine,

vinorelbine.

The following are compatible in the same infusion solution: cisplatin with etoposide, fluorouracil, mesna,

methotrexate, mitoxantrone and ondansetron.

The following are compatible in the same syringe: furosemide, heparin, leucovorin, metoclopramide.

Incompatibility46: Amphotericin is incompatible via Y-site injection.

PARENTERAL ADMINISTRATION:

BCCA administration guideline noted in bold, italics

Subcutaneous no information found

Intramuscular has been used

Direct intravenous each 100 mg or fraction thereof over at least 1

minute

Intermittent infusion in 50-100 mL of compatible IV solution over 20-60

minutes

Continuous infusion the dose can be administered in a convenient

volume

Intraperitoneal has been used but not recommended due to need for

metabolic activation12

Intrapleural has been used but not recommended due to need for

metabolic activation12

Intrathecal no information found; metabolic activation required12

Intra-arterial no information found

Intravesical no information found

DOSAGE GUIDELINES:

Refer to protocol by which patient is being treated. Numerous dosing schedules exist and depend on disease,

response and concomitant therapy. Guidelines for dosing also include consideration of absolute neutrophil count.

Dosage may be reduced, delayed or discontinued in patients with bone marrow depression due to cytotoxic/radiation

therapy or with other toxicities.

Adults:

BCCA usual dose noted in bold, italics

Cycle Length:

Oral: 4 weeks35,47: 100 mg/m2 (range 75-100 mg/m2) once daily for 14

consecutive days

(total dose per cycle 1400 mg/m2)

3-4 weeks47: 300 mg/m2 (range 200-450 mg/m2) once daily for 5

consecutive days. (total dose per cycle 1500 mg/m2

[range 1000-2250 mg/m])

Round dose to the nearest 25 mg. The manufacturer recommends that the drug be taken on an empty stomach, but

states it may be taken with food to decrease GI upset6

Cyclophosphamide

BC Cancer Agency Cancer Drug Manual© Page 10 of 14 Cyclophosphamide

Developed: September 1994

Revised: September 2005

BCCA usual dose noted in bold, italics

Cycle Length:

Oral liquid preparations of Cytoxan® may be prepared by dissolving the cyclophosphamide powder for injection or

the lyophilized powder for injection in Aromatic Elixir, NF.1 Solution stable in amber glass containers for 14 days,

refridgerated.12

Intravenous: 3 weeks48-52: 600 mg/m2 (range 500-1000 mg/m2) for one dose on

day 1

4 weeks53: 1000 mg/m2 for one dose on day 1

6 weeks54: 1200 mg/m2 for one dose on day 1

4 weeks35: 525 mg/m2 for one dose on days 1 and day 15

(total dose per cycle 1050 mg/m2)

4 weeks55: 1200 mg/m2 for one dose on days 1 and day 8

(total dose per cycle 2400 mg/m2)

11 weeks52: 1000 mg/m2 for one dose on day 1 and day 56

(total dose per cycle 2000 mg/m2)

Cyclophosphamide

BC Cancer Agency Cancer Drug Manual© Page 11 of 14 Cyclophosphamide

Developed: September 1994

Revised: September 2005

High dose protocols with or

without bone marrow transplant:

note: ideal body weight is often

used.

60 mg/kg for one dose on day -3 and day -256

(total dose 120 mg/kg over 2 days)

50 mg/kg for one dose on day -6, day -5 and day -457

(total dose 150 mg/kg over 3 days)

2700 mg/m2 for one dose on day 1 and day 258

(total dose 5400 mg/m2 over 2 days)

2500 mg/m2 for one dose on day 1

1800 mg/m2 once daily for five consecutive days starting

on day -559

(total dose 7200 mg/m2 over 4 days)

1800 mg/m2 for one dose on day -6, day -5, day -4 and day

-360,61

(total dose 7200 mg/m2over 4 days)

2000 mg/m2 for one dose on day 3, day 4 and day 562

(total dose 6000 mg/m2over 3 days)

1000 mg/m2for one dose on day 1 and day 263

(total dose 2000 mg/m2over 2 days)

Concurrent radiation: infrequently radiation is given during treatment54,64; more often given following

chemotherapy35,65-71

Dosage in myelosuppression: modify according to protocol by which patient is being treated; if no guidelines

available, refer to Appendix 6 "Dosage Modification for Myelosuppression"

Dosage in renal failure: Suggested dose modifications72:

Creatinine clearance

(mL/min)

Cyclophosphamide

dose

>50-10 100%

<10 75%

Calculated creatinine clearance = N* x (140 - Age) x weight

Serum Creatinine in μmol/L

* For males N = 1.23; for females N = 1.04

Dosage in hepatic failure: no adjustment required

Dosage in dialysis: dialyzable with a high extraction efficiency8

hemodialysis: ½ dose has been suggested72

there have been 2 case reports of giving high-dose cyclophosphamide with

continuous bladder irrigation +/- mesna.73,74 Hemodialysis (duration 6 h) was

performed 6 h73 and 14 h74 after cyclophosphamide infusion. Dialysis should not

be started sooner then 12 h after cyclophosphamide infusion.75

chronic ambulatory peritoneal dialysis (CAPD): no data72

continuous arteriovenous or venovenous hemofiltration (CAVH): dose for GFR

10-5072

Cyclophosphamide

BC Cancer Agency Cancer Drug Manual© Page 12 of 14 Cyclophosphamide

Developed: September 1994

Revised: September 2005

Children76,77:

Cycle Length:

Oral: daily: 50-300 mg/m2

Intravenous: 3-4 weeks76: 250-1800 mg/m2 for one dose on day 1, day 2, day 3 and

day 4

3-4 weeks77: up to 2000-3000 mg/m2 for one dose on day 1

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