United States - English - NLM (National Library of Medicine)
TRETINOIN- tretinoin capsule
American Health Packaging
1. Experienced Physician and Institution
Patients with acute promyelocytic leukemia (APL) are at high risk in general and can have
severe adverse reactions to tretinoin capsules. Tretinoin capsules should therefore be
administered only to patients with APL under the strict supervision of a physician who is
experienced in the management of patients with acute leukemia and in a facility with laboratory
and supportive services sufficient to monitor drug tolerance and protect and maintain a patient
compromised by drug toxicity, including respiratory compromise. Use of tretinoin capsules
requires that the physician concludes that the possible benefit to the patient outweighs the
following known adverse effects of the therapy.
2. Retinoic Acid-APL Syndrome
About 25% of patients with APL treated with tretinoin capsules have experienced a syndrome
called the retinoic acid-APL (RA-APL) syndrome characterized by fever, dyspnea, acute
respiratory distress, weight gain, radiographic pulmonary infiltrates, pleural and pericardial
effusions, edema, and hepatic, renal, and multi-organ failure. This syndrome has occasionally
been accompanied by impaired myocardial contractility and episodic hypotension. It has been
observed with or without concomitant leukocytosis. Endotracheal intubation and mechanical
ventilation have been required in some cases due to progressive hypoxemia, and several
patients have expired with multi-organ failure. The syndrome generally occurs during the first
month of treatment, with some cases reported following the first dose of tretinoin capsules.
The management of the syndrome has not been defined rigorously, but high-dose steroids
given at the first suspicion of the RA-APL syndrome appear to reduce morbidity and mortality.
At the first signs suggestive of the syndrome (unexplained fever, dyspnea and/or weight gain,
abnormal chest auscultatory findings or radiographic abnormalities), high-dose steroids
(dexamethasone 10 mg intravenously administered every 12 hours for 3 days or until the
resolution of symptoms) should be immediately initiated, irrespective of the leukocyte count.
The majority of patients do not require termination of tretinoin capsules therapy during
treatment of the RA-APL syndrome. However, in cases of moderate and severe RA-APL
syndrome, temporary interruption of tretinoin capsules therapy should be considered.
3. Leukocytosis at Presentation and Rapidly Evolving Leukocytosis During Tretinoin
During tretinoin capsules treatment about 40% of patients will develop rapidly evolving
leukocytosis. Patients who present with high WBC at diagnosis (>5x10
/L) have an increased
risk of a further rapid increase in WBC counts. Rapidly evolving leukocytosis is associated
with a higher risk of life-threatening complications.
If signs and symptoms of the RA-APL syndrome are present together with leukocytosis,
treatment with high-dose steroids should be initiated immediately. Some investigators
routinely add chemotherapy to tretinoin capsules treatment in the case of patients presenting
with a WBC count of >5x10
/L or in the case of a rapid increase in WBC count for patients
leukopenic at start of treatment, and have reported a lower incidence of the RA-APL
syndrome. Consideration could be given to adding full-dose chemotherapy (including an
anthracycline if not contraindicated) to the tretinoin capsules therapy on day 1 or 2 for patients
presenting with a WBC count of >5x10
/L, or immediately, for patients presenting with a
WBC count of <5x10
/L, if the WBC count reaches ≥6x10
/L by day 5, or ≥10x10
day 10, or ≥15x10
/L by day 28.
4. Teratogenic Effects. Pregnancy Category D–see WARNINGS
There is a high risk that a severely deformed infant will result if tretinoin capsules are
administered during pregnancy. If, nonetheless, it is determined that tretinoin capsules
represent the best available treatment for a pregnant woman or a woman of childbearing
potential, it must be assured that the patient has received full information and warnings of the
risk to the fetus if she were to be pregnant and of the risk of possible contraception failure and
has been instructed in the need to use two reliable forms of contraception simultaneously
during therapy and for 1 month following discontinuation of therapy, and has acknowledged
her understanding of the need for using dual contraception, unless abstinence is the chosen
Within 1 week prior to the institution of tretinoin capsules therapy, the patient should have
blood or urine collected for a serum or urine pregnancy test with a sensitivity of at least 50
mIU/mL. When possible, tretinoin capsules therapy should be delayed until a negative result
from this test is obtained. When a delay is not possible, the patient should be placed on two
reliable forms of contraception. Pregnancy testing and contraception counseling should be
repeated monthly throughout the period of tretinoin capsules treatment.
Tretinoin Capsules are a retinoid that induces maturation of acute promyelocytic leukemia (APL) cells
in culture. It is available in a 10 mg soft gelatin capsule for oral administration. Each capsule also
contains butylated hydroxyanisole, edetate disodium, soybean oil, hydrogenated vegetable oils, medium
chain triglycerides, soya lecithin, and yellow beeswax. The gelatin capsule shell contains gelatin,
glycerin, yellow iron oxide, red iron oxide and titanium dioxide. Capsules are printed with edible black
ink, which consist of propylene glycol, iron oxide black, polyvinyl acetate phthalate and polyethylene
Chemically, tretinoin is all- trans retinoic acid and is related to retinol (Vitamin A). It is a yellow to light
orange crystalline powder with a molecular weight of 300.44.
The structural formula is as follows:
Mechanism of Action
Tretinoin is not a cytolytic agent but instead induces cytodifferentiation and decreased proliferation of
APL cells in culture and in vivo. In APL patients, tretinoin treatment produces an initial maturation of the
primitive promyelocytes derived from the leukemic clone, followed by a repopulation of the bone
marrow and peripheral blood by normal, polyclonal hematopoietic cells in patients achieving complete
remission (CR). The exact mechanism of action of tretinoin in APL is unknown.
Tretinoin activity is primarily due to the parent drug. In human pharmacokinetics studies, orally
administered drug was well absorbed into the systemic circulation, with approximately two-thirds of the
administered radiolabel recovered in the urine. The terminal elimination half-life of tretinoin following
initial dosing is 0.5 to 2 hours in patients with APL. There is evidence that tretinoin induces its own
metabolism. Plasma tretinoin concentrations decrease on average to one-third of their day 1 values
during 1 week of continuous therapy. Mean ± SD peak tretinoin concentrations decreased from 394 ± 89
to 138 ± 139 ng/mL, while area under the curve (AUC) values decreased from 537 ± 191 ng·h/mL to
249 ± 185 ng·h/mL during 45 mg/m
daily dosing in 7 APL patients. Increasing the dose to “correct”
for this change has not increased response.
A single 45 mg/m
(~80 mg) oral dose to APL patients resulted in a mean ± SD peak tretinoin
concentration of 347 ± 266 ng/mL. Time to reach peak concentration was between 1 and 2 hours.
The apparent volume of distribution of tretinoin has not been determined. Tretinoin is greater than 95%
bound in plasma, predominately to albumin. Plasma protein binding remains constant over the
concentration range of 10 to 500 ng/mL.
Tretinoin metabolites have been identified in plasma and urine. Cytochrome P450 enzymes have been
implicated in the oxidative metabolism of tretinoin. Metabolites include 13- cis retinoic acid, 4-oxo
trans retinoic acid, 4-oxo cis retinoic acid, and 4-oxo trans retinoic acid glucuronide. In APL patients,
daily administration of a 45 mg/m
dose of tretinoin resulted in an approximately tenfold increase in the
urinary excretion of 4-oxo trans retinoic acid glucuronide after 2 to 6 weeks of continuous dosing,
when compared to baseline values.
Studies with radiolabeled drug have demonstrated that after the oral administration of 2.75 and 50 mg
doses of tretinoin, greater than 90% of the radioactivity was recovered in the urine and feces. Based
upon data from 3 subjects, approximately 63% of radioactivity was recovered in the urine within 72
hours and 31% appeared in the feces within 6 days.
The pharmacokinetics of tretinoin have not been separately evaluated in women, in members of different
ethnic groups, or in individuals with renal or hepatic insufficiency.
In 13 patients who had received daily doses of tretinoin for 4 consecutive weeks, administration of
ketoconazole (400 to 1200 mg oral dose) 1 hour prior to the administration of the tretinoin dose on day
29 led to a 72% increase (218 ± 224 vs 375 ± 285 ng·h/mL) in tretinoin mean plasma AUC. The precise
cytochrome P450 enzymes involved in these interactions have not been specified; CYP 3A4, 2C8 and
2E have been implicated in various preliminary reports.
Tretinoin capsules have been investigated in 114 previously treated APL patients and in 67 previously
untreated (“de novo”) patients in one open-label, uncontrolled single investigator clinical study
(Memorial Sloan-Kettering Cancer Center [MSKCC]) and in two cohorts of compassionate cases treated
by multiple investigators under the auspices of the National Cancer Institute (NCI). All patients received
/day as a divided oral dose for up to 90 days or 30 days beyond the day that CR was reached.
Results are shown in the following table:
NCI Cohort 1
NCI Cohort 2
NR = Not Reached
NA = Not Available
The median time to CR was between 40 and 50 days (range: 2 to 120 days). Most patients in these
studies received cytotoxic chemotherapy during the remission phase. These results compare to the
30% to 50% CR rate and ≤6 month median survival reported for cytotoxic chemotherapy of APL in the
treatment of relapse.
Ten of 15 pediatric cases achieved CR (8 of 10 males and 2 of 5 females). There were insufficient
patients of black, Hispanic or Asian derivation to estimate relative response rates in these groups, but
responses were seen in each category.
Responses were seen in 3 of 4 patients for whom cytogenetic analysis failed to detect the t(15;17)
translocation typically seen in APL. The t(15;17) translocation results in the PML/RARα gene, which
appears necessary for this disease. Molecular genetic studies were not conducted in these cases, but it
is likely they represent cases with a masked translocation giving rise to PML/RARα. Responses to
tretinoin have not been observed in cases in which PML/RARα fusion has been shown to be absent.
INDICATIONS AND USAGE
Tretinoin capsules are indicated for the induction of remission in patients with acute promyelocytic
leukemia (APL), French-American-British (FAB) classification M3 (including the M3 variant),
characterized by the presence of the t(15;17) translocation and/or the presence of the PML/RARα gene
who are refractory to, or who have relapsed from, anthracycline chemotherapy, or for whom
anthracycline-based chemotherapy is contraindicated. Tretinoin capsules are for the induction of
remission only. The optimal consolidation or maintenance regimens have not been defined, but all
patients should receive an accepted form of remission consolidation and/or maintenance therapy for
APL after completion of induction therapy with tretinoin capsules.
Tretinoin capsules are contraindicated in patients with a known hypersensitivity to tretinoin capsules,
any of its components, or other retinoids. Tretinoin capsules should not be given to patients who are
sensitive to parabens, which are used as preservatives in the gelatin capsule.
Pregnancy Category D – See Boxed WARNINGS
Tretinoin has teratogenic and embryotoxic effects in mice, rats, hamsters, rabbits and pigtail monkeys,
and may be expected to cause fetal harm when administered to a pregnant woman. Tretinoin causes fetal
resorptions and a decrease in live fetuses in all animals studied. Gross external, soft tissue and skeletal
alterations occurred at doses higher than 0.7 mg/kg/day in mice, 2 mg/kg/day in rats, 7 mg/kg/day in
hamsters, and at a dose of 10 mg/kg/day, the only dose tested, in pigtail monkeys (about 1/20, 1/4, and 1/2
and 4 times the human dose, respectively, on a mg/m
There are no adequate and well-controlled studies in pregnant women. Although experience with
Including 9 chemorefractory patients
Including 8 patients who received chemotherapy but failed to enter remission
humans administered tretinoin capsules is extremely limited, increased spontaneous abortions and major
human fetal abnormalities related to the use of other retinoids have been documented in humans.
Reported defects include abnormalities of the CNS, musculoskeletal system, external ear, eye, thymus
and great vessels; and facial dysmorphia, cleft palate, and parathyroid hormone deficiency. Some of
these abnormalities were fatal. Cases of IQ scores less than 85, with or without obvious CNS
abnormalities, have also been reported. All fetuses exposed during pregnancy can be affected and at the
present time there is no antepartum means of determining which fetuses are and are not affected.
Effective contraception must be used by all females during tretinoin capsules therapy and for 1 month
following discontinuation of therapy. Contraception must be used even when there is a history of
infertility or menopause, unless a hysterectomy has been performed. Whenever contraception is
required, it is recommended that two reliable forms of contraception be used simultaneously, unless
abstinence is the chosen method. If pregnancy does occur during treatment, the physician and patient
should discuss the desirability of continuing or terminating the pregnancy.
Patients Without the t(15;17) Translocation
Initiation of therapy with tretinoin capsules may be based on the morphological diagnosis of acute
promyelocytic leukemia. Confirmation of the diagnosis of APL should be sought by detection of the
t(15;17) genetic marker by cytogenetic studies. If these are negative, PML/RARα fusion should be
sought using molecular diagnostic techniques. The response rate of other AML subtypes to tretinoin
capsules has not been demonstrated; therefore, patients who lack the genetic marker should be
considered for alternative treatment.
Retinoic Acid-APL (RA-APL) Syndrome
In up to 25% of patients with APL treated with tretinoin capsules, a syndrome occurs which can be fatal
(see Boxed WARNINGS and ADVERSE REACTIONS).
Leukocytosis at Presentation and Rapidly Evolving Leukocytosis During Tretinoin Capsules
See Boxed WARNINGS.
Retinoids, including tretinoin capsules, have been associated with pseudotumor cerebri (benign
intracranial hypertension), especially in pediatric patients. The concomitant use of other agents known to
cause pseudotumor cerebri/intracranial hypertension, such as tetracyclines, might increase the risk of
this condition (see PRECAUTIONS: Drug Interactions). Early signs and symptoms of pseudotumor
cerebri include papilledema, headache, nausea and vomiting, and visual disturbances. Patients with these
symptoms should be evaluated for pseudotumor cerebri, and, if present, appropriate care should be
instituted in concert with neurological assessment.
Up to 60% of patients experienced hypercholesterolemia and/or hypertriglyceridemia, which were
reversible upon completion of treatment. The clinical consequences of temporary elevation of
triglycerides and cholesterol are unknown, but venous thrombosis and myocardial infarction have been
reported in patients who ordinarily are at low risk for such complications.
Elevated Liver Function Test Results
Elevated liver function test results occur in 50% to 60% of patients during treatment. Liver function test
results should be carefully monitored during treatment and consideration be given to a temporary
withdrawal of tretinoin capsules if test results reach >5 times the upper limit of normal values.
However, the majority of these abnormalities resolve without interruption of tretinoin capsules or after
completion of treatment.
Tretinoin capsules have potentially significant toxic side effects in APL patients. Patients undergoing
therapy should be closely observed for signs of respiratory compromise and/or leukocytosis (see
Boxed WARNINGS). Supportive care appropriate for APL patients, eg, prophylaxis for bleeding,
prompt therapy for infection, should be maintained during therapy with tretinoin capsules.
There is a risk of thrombosis (both venous and arterial) which may involve any organ system, during the
first month of treatment (see ADVERSE REACTIONS). Therefore, caution should be exercised when
treating patients with the combination of tretinoin capsules and anti-fibrinolytic agents, such as
tranexamic acid, aminocaproic acid or aprotinin (see Drug Interactions).
The ability to drive or operate machinery might be impaired in patients treated with tretinoin capsules,
particularly if they are experiencing dizziness or severe headache.
Microdosed progesterone preparations (“minipill”) may be an inadequate method of contraception
during treatment with tretinoin capsules.
The patient’s hematologic profile, coagulation profile, liver function test results, and triglyceride and
cholesterol levels should be monitored frequently.
Limited clinical data on potential drug interactions are available.
Drugs Metabolized By the Hepatic P450 System
As tretinoin capsules are metabolized by the hepatic P450 system, there is a potential for alteration of
pharmacokinetics parameters in patients administered concomitant medications that are also inducers or
inhibitors of this system. Medications that generally induce hepatic P450 enzymes include rifampicin,
glucocorticoids, phenobarbital and pentobarbital. Medications that generally inhibit hepatic P450
enzymes include ketoconazole, cimetidine, erythromycin, verapamil, diltiazem and cyclosporine. To
date there are no data to suggest that co-use with these medications increases or decreases either
efficacy or toxicity of tretinoin capsules.
Agents Known to Cause Pseudotumor Cerebri/Intracranial Hypertension (Such as Tetracyclines)
Tretinoin capsules may cause pseudotumor cerebri/intracranial hypertension. Concomitant
administration of tretinoin capsules and agents known to cause pseudotumor cerebri/intracranial
hypertension as well might increase the risk of this condition (see WARNINGS).
As with other retinoids, tretinoin capsules must not be administered in combination with vitamin A
because symptoms of hypervitaminosis A could be aggravated.
Anti-fibrinolytic Agents (Such as Tranexamic Acid, Aminocaproic Acid, or Aprotinin)
Cases of fatal thrombotic complications have been reported rarely in patients concomitantly treated with
tretinoin capsules and anti-fibrinolytic agents. Therefore, caution should be exercised when
administering tretinoin capsules concomitantly with these agents (see PRECAUTIONS: General).
Effect of Food
No data on the effect of food on the absorption of tretinoin capsules are available. The absorption of
retinoids as a class has been shown to be enhanced when taken together with food.
Carcinogenesis, Mutagenesis and Impairment of Fertility
No long-term carcinogenicity studies with tretinoin have been conducted. In short-term carcinogenicity
studies, tretinoin at a dose of 30 mg/kg/day (about 2 times the human dose on a mg/m
basis) was shown
to increase the rate of diethylnitrosamine (DEN)-induced mouse liver adenomas and carcinomas.
Tretinoin was negative when tested in the Ames and Chinese hamster V79 cell HGPRT assays for
mutagenicity. A twofold increase in the sister chromatid exchange (SCE) has been demonstrated in
human diploid fibroblasts, but other chromosome aberration assays, including an in vitro assay in human
peripheral lymphocytes and an in vivo mouse micronucleus assay, did not show a clastogenic or
aneuploidogenic effect. Adverse effects on fertility and reproductive performance were not observed
in studies conducted in rats at doses up to 5 mg/kg/day (about 2/3 the human dose on a mg/m
basis). In a
6-week toxicology study in dogs, minimal to marked testicular degeneration, with increased numbers of
immature spermatozoa, were observed at 10 mg/kg/day (about 4 times the equivalent human dose in mg/m
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 from tretinoin capsules in nursing
infants, mothers should discontinue nursing prior to taking this drug.
There are limited clinical data on the pediatric use of tretinoin capsules. Of 15 pediatric patients (age
range: 1 to 16 years) treated with tretinoin capsules, the incidence of complete remission was 67%.
Safety and effectiveness in pediatric patients below the age of 1 year have not been established. Some
pediatric patients experience severe headache and pseudotumor cerebri, requiring analgesic treatment
and lumbar puncture for relief. Increased caution is recommended in the treatment of pediatric patients.
Dose reduction may be considered for pediatric patients experiencing serious and/or intolerable
toxicity; however, the efficacy and safety of tretinoin capsules at doses lower than 45 mg/m
not been evaluated in the pediatric population.
Of the total number of subjects in clinical studies of tretinoin capsules, 21.4% were 60 and over. No
overall differences in safety or effectiveness were observed between these subjects and younger
subjects, and other reported clinical experience has not identified differences in responses between the
elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.
Virtually all patients experience some drug-related toxicity, especially head ache, fever, weakness, and
fatigue. These adverse effects are seldom permanent or irreversible nor do they usually require
interruption of therapy. Some of the adverse events are common in patients with APL, including
hemorrhage, infections, gastrointestinal hemorrhage, disseminated intravascular coagulation,
pneumonia, septicemia, and cerebral hemorrhage. The following describes the adverse events,
regardless of drug relationship, that were observed in patients treated with tretinoin capsules.
Typical Retinoid Toxicity
The most frequently reported adverse events were similar to those described in patients taking high
doses of vitamin A and included headache (86%), fever (83%), skin/mucous membrane dryness (77%),
bone pain (77%), nausea/vomiting (57%), rash (54%), mucositis (26%), pruritus (20%), increased
sweating (20%), visual disturbances (17%), ocular disorders (17%), alopecia (14%), skin changes
(14%), changed visual acuity (6%), bone inflammation (3%), visual field defects (3%).
APL patients treated with tretinoin capsules have experienced a potentially fatal syndrome characterized
by fever, dyspnea, acute respiratory distress, weight gain, radiographic pulmonary infiltrates, pleural
and pericardial effusions, edema, and hepatic, renal, and multi-organ failure. This syndrome has
occasionally been accompanied by impaired myocardial contractility and episodic hypotension and has
been observed with or without concomitant leukocytosis. Some patients have expired due to
progressive hypoxemia and multi-organ failure. The syndrome generally occurs during the first month
of treatment, with some cases reported following the first dose of tretinoin capsules. The management
of the syndrome has not been defined rigorously, but high-dose steroids given at the first signs of the
syndrome appear to reduce morbidity and mortality. Treatment with dexamethasone, 10 mg intravenously
administered every 12 hours for 3 days or until resolution of symptoms, should be initiated without
delay at the first suspicion of symptoms (one or more of the following: fever, dyspnea, weight gain,
abnormal chest auscultatory findings or radiographic abnormalities). Sixty percent or more of patients
treated with tretinoin capsules may require high-dose steroids because of these symptoms. The majority
of patients do not require termination of tretinoin capsules therapy during treatment of the syndrome.
Body as a Whole
General disorders related to tretinoin capsules administration and/or associated with APL included
malaise (66%), shivering (63%), hemorrhage (60%), infections (58%), peripheral edema (52%), pain
(37%), chest discomfort (32%), edema (29%), disseminated intravascular coagulation (26%), weight
increase (23%), injection site reactions (17%), anorexia (17%), weight decrease (17%), myalgia (14%),
flank pain (9%), cellulitis (8%), face edema (6%), fluid imbalance (6%), pallor (6%), lymph disorders
(6%), acidosis (3%), hypothermia (3%), ascites (3%).
Respiratory System Disorders
Respiratory system disorders were commonly reported in APL patients administered tretinoin capsules.
The majority of these events are symptoms of the RA-APL syndrome (see Boxed WARNINGS).
Respiratory system adverse events included upper respiratory tract disorders (63%), dyspnea (60%),
respiratory insufficiency (26%), pleural effusion (20%), pneumonia (14%), rales (14%), expiratory
wheezing (14%), lower respiratory tract disorders (9%), pulmonary infiltration (6%), bronchial asthma
(3%), pulmonary edema (3%), larynx edema (3%), unspecified pulmonary disease (3%).
Ear disorders were consistently reported, with earache or feeling of fullness in the ears reported by
23% of the patients. Hearing loss and other unspecified auricular disorders were observed in 6% of
patients, with infrequent (<1%) reports of irreversible hearing loss.
GI disorders included GI hemorrhage (34%), abdominal pain (31%), other gastrointestinal disorders
(26%), diarrhea (23%), constipation (17%), dyspepsia (14%), abdominal distention (11%),
hepatosplenomegaly (9%), hepatitis (3%), ulcer (3%), unspecified liver disorder (3%).
Cardiovascular and Heart Rate and Rhythm Disorders
Arrhythmias (23%), flushing (23%), hypotension (14%), hypertension (11%), phlebitis (11%), cardiac
failure (6%) and for 3% of patients: cardiac arrest, myocardial infarction, enlarged heart, heart murmur,
ischemia, stroke, myocarditis, pericarditis, pulmonary hypertension, secondary cardiomyopathy.
Central and Peripheral Nervous System Disorders and Psychiatric
Dizziness (20%), paresthesias (17%), anxiety (17%), insomnia (14%), depression (14%), confusion
(11%), cerebral hemorrhage (9%), intracranial hypertension (9%), agitation (9%), hallucination (6%) and
for 3% of patients: abnormal gait, agnosia, aphasia, asterixis, cerebellar edema, cerebellar disorders,
convulsions, coma, CNS depression, dysarthria, encephalopathy, facial paralysis, hemiplegia,
hyporeflexia, hypotaxia, no light reflex, neurologic reaction, spinal cord disorder, tremor, leg
weakness, unconsciousness, dementia, forgetfulness, somnolence, slow speech.
Urinary System Disorders
Renal insufficiency (11%), dysuria (9%), acute renal failure (3%), micturition frequency (3%), renal
tubular necrosis (3%), enlarged prostate (3%).
Miscellaneous Adverse Events
Isolated cases of erythema nodosum, basophilia and hyperhistaminemia, Sweet’s syndrome,
organomegaly, hypercalcemia, pancreatitis and myositis have been reported.
Additional Adverse Reactions Reported With Tretinoin Capsules
Cases of thrombosis (both venous and arterial) involving various sites (eg, cerebrovascular accident,
myocardial infarction, renal infarct) have been reported rarely (see PRECAUTIONS: General).
Rare cases of thrombocytosis have been reported.
Miscellaneous Adverse Events
Rare cases of vasculitis, predominantly involving the skin, have been reported.
In case of overdose with Tretinoin, reversible signs of hypervitaminosis A (headache, nausea,
vomiting, mucocutaneous symptoms) can appear. The maximal tolerated dose in patients with
myelodysplastic syndrome or solid tumors was 195 mg/m
/day. The maximal tolerated dose in pediatric
patients was lower at 60 mg/m
/day. Overdosage with other retinoids has been associated with transient
headache, facial flushing, cheilosis, abdominal pain, dizziness and ataxia. These symptoms have quickly
resolved without apparent residual effects.
There is no specific treatment in the case of an overdose; however, it is important that the patient be
treated in a special hematological unit.
DOSAGE AND ADMINISTRATION
The recommended dose is 45 mg/m
/day administered as two evenly divided doses until complete
remission is documented. Therapy should be discontinued 30 days after achievement of complete
remission or after 90 days of treatment, whichever occurs first.
If after initiation of treatment of Tretinoin Capsules the presence of the t(15;17) translocation is not
confirmed by cytogenetics and/or by polymerase chain reaction studies and the patient has not responded
to tretinoin capsules, alternative therapy appropriate for acute myelogenous leukemia should be
Tretinoin Capsules are for the induction of remission only. Optimal consolidation or maintenance
regimens have not been determined. All patients should, therefore, receive a standard consolidation
and/or maintenance chemotherapy regimen for APL after induction therapy with tretinoin capsules,