Overdose
Signs And Symptoms
In postmarketing experience of overdose with zolpidem
tartrate alone, or in combination with CNS-depressant agents, impairment of
consciousness ranging from somnolence to coma, cardiovascular and/or
respiratory compromise, and fatal outcomes have been reported.
Recommended Treatment
Based on data obtained for zolpidem tartrate, general
symptomatic and supportive measures for overdose with Edluar should be used
along with immediate gastric lavage where appropriate. Intravenous fluids
should be administered as needed. Zolpidem's sedative/hypnotic effect was shown
to be reduced by flumazenil and therefore may be useful; however, flumazenil
administration may contribute to the appearance of neurological symptoms
(convulsions). As in all cases of drug overdose, respiration, pulse, blood pressure,
and other appropriate signs should be monitored and general supportive measures
employed. Hypotension and CNS depression should be monitored and treated by
appropriate medical intervention. Sedating drugs should be withheld following
zolpidem overdosage, even if excitation occurs. The value of dialysis in the
treatment of overdosage has not been determined, although hemodialysis studies
in patients with renal failure receiving therapeutic doses have demonstrated
that zolpidem is not dialyzable.
As with the management of all overdosage, the possibility
of multiple drug ingestion should be considered. The physician may wish to
consider contacting a poison control center for up-to-date information on the
management of hypnotic drug product overdosage.
Contraindications
Edluar is contraindicated in patients with known
hypersensitivity to zolpidem. Observed reactions include anaphylaxis and
angioedema.
Undesirable effects
The following serious adverse reactions are discussed in
greater detail in other sections of the labeling:
- CNS-depressant effects and next-day impairment
- Serious anaphylactic and anaphylactoid reactions
- Abnormal thinking and behavior changes, and complex
behaviors
- Withdrawal effects
Clinical Trials Experience
Associated With Discontinuation Of Treatment
Approximately 4% of 1,701 patients who received zolpidem
tartrate at all doses (1.25 to 90 mg) in U.S. premarketing clinical trials
discontinued treatment because of an adverse reaction. Reactions most commonly
associated with discontinuation from U.S. trials were daytime drowsiness
(0.5%), dizziness (0.4%), headache (0.5%), nausea (0.6%), and vomiting (0.5%).
Approximately 4% of 1,959 patients who received zolpidem
tartrate at all doses (1 to 50 mg) in similar foreign trials discontinued
treatment because of an adverse reaction. Reactions most commonly associated
with discontinuation from these trials were daytime drowsiness (1.1%),
dizziness/vertigo (0.8%), amnesia (0.5%), nausea (0.5%), headache (0.4%), and
falls (0.4%).
Data from a clinical study in which selective serotonin
reuptake inhibitor (SSRI)-treated patients were given zolpidem tartrate
revealed that four of the seven discontinuations during double-blind treatment
with zolpidem (n=95) were associated with impaired concentration, continuing or
aggravated depression, and manic reaction; one patient treated with placebo
(n=97) was discontinued after an attempted suicide.
Most Commonly Observed Adverse Reactions In Controlled Trials
During short-term treatment (up to 10 nights) with
zolpidem tartrate at doses up to 10 mg, the most commonly observed adverse
reactions associated with the use of zolpidem and seen at statistically
significant differences from placebo-treated patients were drowsiness (reported
by 2% of zolpidem patients), dizziness (1%), and diarrhea (1%). During
longer-term treatment (28 to 35 nights) with zolpidem tartrate at doses up to
10 mg, the most commonly observed adverse reactions associated with the use of
zolpidem and seen at statistically significant differences from placebo-treated
patients were dizziness (5%) and drugged feelings (3%).
Adverse Reactions Observed At An Incidence Of = 1% In Controlled Trials
The following tables enumerate treatment-emergent adverse
event frequencies that were observed at an incidence equal to 1% or greater
among patients with insomnia who received zolpidem tartrate and at a greater
incidence than placebo in U.S. placebo-controlled trials. Events reported by
investigators were classified utilizing a modified World Health Organization
(WHO) dictionary of preferred terms for the purpose of establishing event
frequencies. The prescriber should be aware that these figures cannot be used
to predict the incidence of side effects in the course of usual medical
practice, in which patient characteristics and other factors differ from those
that prevailed in these clinical trials. Similarly, the cited frequencies
cannot be compared with figures obtained from other clinical investigators
involving related drug products and uses, since each group of drug trials is
conducted under a different set of conditions. However, the cited figures
provide the physician with a basis for estimating the relative contribution of
drug and nondrug factors to the incidence of side effects in the population
studied.
The following table was derived from a pool of 11
placebo-controlled short-term U.S. efficacy trials involving zolpidem in doses
ranging from 1.25 to 20 mg. The table is limited to data from doses up to and
including 10 mg, the highest dose recommended for use.
TABLE 1: Incidence of Treatment-Emergent Adverse
Experiences in Placebo-Controlled Clinical Trials with zolpidem tartrate
lasting up to 10 nights (Percentage of patients reporting)
| Body System/ Adverse Event* |
Zolpidem tartrate ( ≤ 10 mg)
(N=685) |
Placebo
(N=473) |
| Central and Peripheral Nervous System |
| Headache |
7 |
6 |
| Drowsiness |
2 |
- |
| Dizziness |
1 |
- |
| Gastrointestinal System |
| Diarrhea |
1 |
- |
| *Reactions reported by at least
1 % of patients treated with oral zolpidem and at a greater frequency than
placebo. |
The following table was derived
from a pool of three placebo-controlled long-term efficacy trials involving
oral zolpidem. These trials involved patients with chronic insomnia who were
treated for 28 to 35 nights with zolpidem at doses of 5, 10, or 15 mg. The
table is limited to data from doses up to and including 10 mg, the highest dose
recommended for use. The table includes only adverse events occurring at an
incidence of at least 1% for zolpidem patients.
TABLE 2: Incidence of Treatment-Emergent Adverse
Experiences in Placebo-Controlled Clinical Trials with zolpidem tartrate
lasting up to 35 nights (Percentage of patients reporting)
| Body System/ Adverse Event* |
Zolpidem tartrate ( ≤ 10 mg) (N=152) |
Placebo (N=161) |
| Autonomic Nervous System Dry mouth |
3 |
1 |
| Body as a Whole |
| Allergy |
4 |
1 |
| Back Pain |
3 |
2 |
| Influenza-like symptoms |
2 |
- |
| Chest pain |
1 |
- |
| Cardiovascular System |
| Palpitation |
2 |
- |
| Central and Peripheral Nervous System |
| Drowsiness |
8 |
5 |
| Dizziness |
5 |
1 |
| Lethargy |
3 |
1 |
| Drugged feeling |
3 |
- |
| Lightheadedness |
2 |
1 |
| Depression |
2 |
1 |
| Abnormal dreams |
1 |
- |
| Amnesia |
1 |
- |
| Sleep disorder |
1 |
- |
| Gastrointestinal System |
| Diarrhea |
3 |
2 |
| Abdominal pain |
2 |
2 |
| Constipation |
2 |
1 |
| Respiratory System |
| Sinusitis |
4 |
2 |
| Pharyngitis |
3 |
1 |
| Skin and Appendages |
| Rash |
2 |
1 |
| *Reactions reported by at least
1% of patients treated with oral zolpidem and at a greater frequency than
placebo. |
Dose Relationship For Adverse Reactions Associated With Oral Zolpidem
There is evidence from dose
comparison trials suggesting a dose relationship for many of the adverse
reactions associated with oral zolpidem use, particularly for certain CNS and
gastrointestinal adverse events.
Oral Tissue-Related Adverse Reactions To Edluar
The effect of chronic daily
administration of Edluar on oral tissue was evaluated in a 60-day open-label
study in 60 insomniac patients. One patient developed transient sublingual
erythema, and another transient paresthesia of the tongue.
Adverse Event Incidence Across The Entire Preapproval Oral Zolpidem Database
Zolpidem was administered to 3,660 subjects in clinical
trials throughout the U.S., Canada, and Europe. Treatment-emergent adverse
events associated with clinical trial participation were recorded by clinical
investigators using terminology of their own choosing. To provide a meaningful
estimate of the proportion of individuals experiencing treatment-emergent
adverse events, similar types of untoward events were grouped into a smaller
number of standardized event categories and classified utilizing a modified
World Health Organization (WHO) dictionary of preferred terms.
The frequencies presented, therefore, represent the
proportions of the 3,660 individuals exposed to zolpidem, at all doses, who
experienced an event of the type cited on at least one occasion while receiving
zolpidem. All reported treatment-emergent adverse events are included, except those
already listed in the table above of adverse events in placebo-controlled
studies, those coding terms that are so general as to be uninformative, and
those events where a drug cause was remote. It is important to emphasize that,
although the events reported did occur during treatment with zolpidem, they
were not necessarily caused by it.
Adverse events are further classified within body system
categories and enumerated in order of decreasing frequency using the following
definitions: frequent adverse events are defined as those occurring in greater
than 1/100 subjects; infrequent adverse events are those occurring in 1/100 to
1/1,000 patients; rare events are those occurring in less than 1/1,000
patients.
Autonomic nervous system: Infrequent: increased sweating,
pallor, postural hypotension, syncope. Rare: abnormal accommodation, altered
saliva, flushing, glaucoma, hypotension, impotence, increased saliva, tenesmus.
Body as a whole: Frequent: asthenia. Infrequent:
edema, falling, fever, malaise, trauma.
Rare: allergic reaction, allergy aggravated, anaphylactic
shock, face edema, hot flashes, increased ESR, pain, restless legs, rigors,
tolerance increased, weight decrease.
Cardiovascular system: Infrequent: cerebrovascular
disorder, hypertension, tachycardia.
Rare: angina pectoris, arrhythmia, arteritis, circulatory
failure, extrasystoles, hypertension aggravated, myocardial infarction,
phlebitis, pulmonary embolism, pulmonary edema, varicose veins, ventricular
tachycardia.
Central and peripheral nervous system: Frequent:
ataxia, confusion, euphoria, headache, insomnia, vertigo. Infrequent:
agitation, anxiety, decreased cognition, detached, difficulty concentrating,
dysarthria, emotional lability, hallucination, hypoesthesia, illusion, leg
cramps, migraine, nervousness, paresthesia, sleeping (after daytime dosing),
speech disorder, stupor, tremor. Rare: abnormal gait, abnormal thinking,
aggressive reaction, apathy, appetite increased, decreased libido, delusion,
dementia, depersonalization, dysphasia, feeling strange, hypokinesia,
hypotonia, hysteria, intoxicated feeling, manic reaction, neuralgia, neuritis,
neuropathy, neurosis, panic attacks, paresis, personality disorder,
somnambulism, suicide attempts, tetany, yawning.
Gastrointestinal system: Frequent: dyspepsia,
hiccup, nausea. Infrequent: anorexia, constipation, dysphagia, flatulence,
gastroenteritis, vomiting. Rare: enteritis, eructation, esophagospasm,
gastritis, hemorrhoids, intestinal obstruction, rectal hemorrhage, tooth
caries.
Hematologic and lymphatic system: Rare: anemia,
hyperhemoglobinemia, leukopenia, lymphadenopathy, macrocytic anemia, purpura,
thrombosis.
Immunologic system: Infrequent: infection. Rare:
abscess herpes simplex herpes zoster, otitis externa, otitis media.
Liver and biliary system: Infrequent: abnormal
hepatic function, increased SGPT. Rare: bilirubinemia, increased SGOT.
Metabolic and nutritional: Infrequent:
hyperglycemia, thirst. Rare: gout, hypercholesteremia, hyperlipidemia,
increased alkaline phosphatase, increased BUN, periorbital edema.
Musculoskeletal system: Frequent: arthralgia,
myalgia. Infrequent: arthritis. Rare: arthrosis, muscle weakness, sciatica,
tendinitis.
Reproductive system: Infrequent: menstrual
disorder, vaginitis. Rare: breast fibroadenosis, breast neoplasm, breast pain.
Respiratory system: Frequent: upper respiratory
infection. Infrequent: bronchitis, coughing, dyspnea, rhinitis. Rare:
bronchospasm, epistaxis, hypoxia, laryngitis, pneumonia.
Skin and appendages: Infrequent: pruritus. Rare:
acne, bullous eruption, dermatitis, furunculosis, injection-site inflammation,
photosensitivity reaction, urticaria.
Special senses: Frequent: diplopia, vision
abnormal. Infrequent: eye irritation, eye pain, scleritis, taste perversion,
tinnitus. Rare: conjunctivitis, corneal ulceration, lacrimation abnormal,
parosmia, photopsia.
Urogenital system: Frequent: urinary tract
infection. Infrequent: cystitis, urinary incontinence. Rare: acute renal
failure, dysuria, micturition frequency, nocturia, polyuria, pyelonephritis,
renal pain, urinary retention.
Therapeutic indications
Edluar (zolpidem tartrate)
sublingual tablets are indicated for the short-term treatment of insomnia
characterized by difficulties with sleep initiation.
The clinical trials performed
with Zolpidem tartrate in support of efficacy were 4-5 weeks in duration with
the final formal assessments of sleep latency performed at the end of
treatment.
Pharmacokinetic properties
Women clear zolpidem tartrate
from the body at a lower rate than men, Cmax and AUC parameters of zolpidem
were approximately 45% higher at the same dose in female subjects compared with
male subjects. Given the higher blood levels of zolpidem tartrate in women
compared to men at a given dose, the recommended dose of Edluar for adult women
is 5 mg, and the recommended dose for adult men is 5 or 10 mg.
In geriatric patients,
clearance of zolpidem is similar in men and women. The recommended dose of
Edluar in geriatric patients is 5 mg regardless of gender.
Overdosage & Contraindications
OVERDOSE
Fertility, pregnancy and lactation
Pregnancy Category C
There are no adequate and well-controlled studies of
Edluar in pregnant women. Studies in children to assess the effects of prenatal
exposure to zolpidem have not been conducted; however, cases of severe neonatal
respiratory depression have been reported when zolpidem was used at the end of
pregnancy, especially when taken with other CNS-depressants. Children born to
mothers taking sedative-hypnotic drugs may be at risk for withdrawal symptoms
during the postnatal period. Neonatal flaccidity has also been reported in
infants born to mothers who received sedative-hypnotic drugs during pregnancy.
Edluar should be used during pregnancy only if the potential benefit outweighs
the potential risk to the fetus.
Administration of zolpidem to pregnant rats and rabbits
resulted in adverse effects on offspring development at doses greater than the
maximum recommended human dose (MRHD) of 10 mg/day (approximately 8 mg/day
zolpidem base); however, teratogenicity was not observed.
When zolpidem was administered at oral doses of 4, 20,
and 100 mg base/kg to pregnant rats during the period of organogenesis,
dose-related decreases in fetal skull ossification occurred at all but the
lowest dose, which is approximately 5 times the MRHD on a mg/m&su2; basis.
In rabbits treated during organogenesis with zolpidem at oral doses of 1, 4,
and 16 mg base/kg, increased embryo-fetal death and incomplete fetal skeletal
ossification occurred at the highest dose. The no-effect dose for embryo-fetal
toxicity in rabbits is approximately 10 times the MRHD on a mg/m&su2; basis.
Administration of zolpidem to rats at oral doses of 4, 20, and 100 mg base/kg
during the latter part of pregnancy and throughout lactation produced decreased
offspring growth and survival at all but the lowest dose, which is
approximately 5 times the MRHD on a mg/m&su2; basis.
Qualitative and quantitative composition
Dosage Forms And Strengths
Edluar is available in 5 mg and 10 mg strength tablets
for sublingual administration. Tablets are not scored.
Edluar 5 mg sublingual tablets are round white,
flat-faced, bevel-edged, with debossed V on one side.
Edluar 10 mg sublingual tablets are round white,
flat-faced, bevel-edged, with debossed X on one side.
Storage And Handling
Edluar is supplied as sublingual tablets in two dosage
strengths: Tablets are not scored.
Edluar 5 mg sublingual tablets are round white tablets,
flat-faced, bevel-edged with debossed V on one side and supplied as:
| NDC Number |
Size |
| 0037-6050-30 |
blister pack of 30 |
The blister packs consist of aluminum/aluminum Child
Resistant Control (CRC) blisters.
Edluar 10 mg sublingual tablets are round white tablets,
flat-faced, bevel-edged with debossed X on one side and supplied as:
| NDC Number |
Size |
| 0037-6010-30 |
blister pack of 30 |
The blister packs consist of aluminum/aluminum Child
Resistant Control (CRC) blisters. Store at controlled room temperature 20-25°C
(68-77°F). Protect from light and moisture.
Manufactured by: Recipharm Stockholm AB, Sweden for Meda
Pharmaceuticals Inc. Distributed by: Meda Pharmaceuticals Meda Pharmaceuticals
Inc. Somerset, NJ 08873-4120. Rev. 10/2014
Special warnings and precautions for use
WARNINGS
Included as part of the PRECAUTIONS section.
PRECAUTIONS
CNS Depressant Effects And Next-Day Impairment
Edluar, like other sedative-hypnotic drugs, has central
nervous system (CNS) depressant effects. Co-administration with other CNS
depressants (e.g., benzodiazepines, opioids, tricyclic antidepressants,
alcohol) increases the risk of CNS depression. Dosage adjustments of Edluar and
of other concomitant CNS depressants may be necessary when Edluar is
administered with such agents because of the potentially additive effects. The
use of Edluar with other sedative-hypnotics (including other zolpidem products)
at bedtime or the middle of the night is not recommended.
The risk of next-day psychomotor impairment, including
impaired driving, is increased if Edluar is taken with less than a full night
of sleep remaining (7 to 8 hours); if a higher than the recommended dose is
taken; if co-administered with other CNS depressants; or if coadministered with
other drugs that increase the blood level of zolpidem. Patients should be
cautioned against driving and other activities requiring complete mental
alertness if Edluar is taken in these circumstances.
Need To Evaluate For Co-morbid Diagnoses
Because sleep disturbances may be the presenting
manifestation of a physical and/or psychiatric disorder, symptomatic treatment
of insomnia should be initiated only after a careful evaluation of the patient.
The failure of insomnia to remit after 7 to 10 days of treatment may indicate
the presence of a primary psychiatric and/or medical illness that should be
evaluated. Worsening of insomnia or the emergence of new thinking or behavior
abnormalities may be the consequence of an unrecognized psychiatric or physical
disorder. Such findings have emerged during the course of treatment with
sedative/hypnotic drugs, including zolpidem.
Severe Anaphylactic And Anaphylactoid Reactions
Cases of angioedema involving the tongue, glottis or
larynx have been reported in patients after taking the first or subsequent
doses of sedative-hypnotics, including zolpidem tartrate. Some patients have
had additional symptoms such as dyspnea, throat closing or nausea and vomiting
that suggest anaphylaxis. Some patients have required medical therapy in the
emergency department. If angioedema involves the throat, glottis or larynx,
airway obstruction may occur and be fatal. Patients who develop angioedema
after treatment with Edluar should not be rechallenged with the drug.
Abnormal Thinking And Behavioral Changes
Abnormal thinking and behavior changes have been reported
in patients treated with sedative/hypnotics, including zolpidem. Some of these
changes included decreased inhibition (e.g. aggressiveness and extroversion
that seemed out of character), bizarre behavior, agitation and
depersonalization. Visual and auditory hallucinations have been reported.
In controlled trials of zolpidem tartrate 10 mg taken at
bedtime, < 1% of adults with insomnia who received zolpidem reported
hallucinations. In a clinical trial, 7% of pediatric patients treated with
zolpidem tartrate 0.25 mg/kg taken at bedtime reported hallucinations, versus
0% treated with placebo.
Complex behaviors such as “sleep-driving” (i.e., driving
while not fully awake after ingestion of a sedative-hypnotic, with amnesia for
the event) have been reported in sedative-hypnotic-naive as well as in
sedative-hypnotic-experienced persons. Although behaviors such as
“sleep-driving” have occurred with zolpidem alone at therapeutic doses, the
co-administration of zolpidem with alcohol or other CNS depressants increases
the risk of such behaviors, as does the use of Edluar at doses exceeding the
maximum recommended dose. Due to the risk to the patient and the community,
discontinuation of Edluar should be strongly considered for patients who report
a “sleep-driving” episode.
Other complex behaviors (e.g., preparing and eating food,
making phone calls, or having sex) have been reported in patients who are not
fully awake after taking a sedative-hypnotic. As with “sleep-driving”, patients
usually do not remember these events. Amnesia, anxiety and other
neuro-psychiatric symptoms may also occur.
It can rarely be determined with certainty whether a
particular instance of the abnormal behaviors listed above is drug induced,
spontaneous in origin, or a result of an underlying psychiatric or physical
disorder. Nonetheless, the emergence of any new behavioral sign or symptom of
concern requires careful and immediate evaluation.
Use In Patients With Depression
In primarily depressed patients treated with
sedative-hypnotics, worsening of depression, and suicidal thoughts and actions
(including completed suicides), have been reported. Suicidal tendencies may be
present in such patients and protective measures may be required. Intentional
overdosage is more common in this group of patients; therefore, the least
amount of drug that is feasible should be prescribed for the patient at any one
time.
Respiratory Depression
Although studies with 10 mg zolpidem tartrate did not
reveal respiratory depressant effects at hypnotic doses in healthy subjects or
in patients with mild-to-moderate chronic obstructive pulmonary disease (COPD),
a reduction in the Total Arousal Index, together with a reduction in lowest
oxygen saturation and increase in the time of oxygen desaturation below 80% and
90%, was observed in patients with mild-to-moderate sleep apnea when treated
with zolpidem compared to placebo. Since sedative-hypnotics have the capacity
to depress respiratory drive, precautions should be taken if Edluar is
prescribed to patients with compromised respiratory function. Post-marketing
reports of respiratory insufficiency in patients receiving 10 mg of zolpidem
tartrate, most of whom had pre-existing respiratory impairment, have been
reported. The risks of respiratory depression should be considered prior to
prescribing Edluar in patients with respiratory impairment including sleep
apnea and myasthenia gravis.
Withdrawal Effects
There have been reports of withdrawal signs and symptoms
following the rapid dose decrease or abrupt discontinuation of zolpidem.
Monitor patients for tolerance, abuse, and dependence.
Patient Counseling Information
See FDA-approved patient labeling (Medication Guide).
Inform patients and their families about the benefits and
risks of treatment with Edluar. Inform patients of the availability of a
Medication Guide and instruct them to read the Medication Guide prior to
initiating treatment with Edluar and with each prescription refill. Review the
Edluar Medication Guide with every patient prior to initiation of treatment.
Instruct patients or caregivers that Edluar should be taken only as prescribed.
CNS-depressant Effects and Next-Day Impairment
Tell patients that Edluar has the potential to cause
next-day impairment, and that this risk is increased if dosing instructions are
not carefully followed. Tell patients to wait for at least 8 hours after dosing
before driving or engaging in other activities requiring full mental alertness.
Inform patients that impairment can be present despite feeling fully awake.
Severe Anaphylactic and Anaphylactoid Reactions
Inform patients that severe anaphylactic and
anaphylactoid reactions have occurred with zolpidem. Describe the
signs/symptoms of these reactions and advise patients to seek medical attention
immediately if any of them occur.
Sleep-Driving and Other Complex Behaviors
Instruct patients and their families that sedative
hypnotics can cause abnormal thinking and behavior change, including
“sleep-driving” and other complex behaviors while not being fully awake
(preparing and eating food, making phone calls, or having sex). Tell patients
to call you immediately if they develop any of these symptoms.
Suicide
Tell patients to immediately report any suicidal
thoughts.
Alcohol and Other Drugs
Ask patients about alcohol consumption, medicines they
are taking, and drugs they may be taking without a prescription. Advise
patients not to use Edluar if they drank alcohol that evening or before bed.
Tolerance, Abuse, and Dependence
Tell patients not to increase the dose of Edluar on their
own, and to inform you if they believe the drug “does not work”.
Administration Instructions
Patients should be counseled to take Edluar right before
they get into bed and only when they are able to stay in bed a full night (7-8
hours) before being active again. Edluar tablets should not be taken with or
immediately after a meal. Advise patients NOT to take Edluar when drinking
alcohol that evening or before bed. Edluar sublingual tablet should be placed
under the tongue, where it will disintegrate. The tablet should not be
swallowed and the tablet should not be taken with water.
Nonclinical Toxicology
Carcinogenesis, Mutagenesis, Impairment Of Fertility
Carcinogenesis
Zolpidem was administered to mice and rats for 2 years at
oral doses of 4, 18, and 80 mg base/kg. In mice, these doses are approximately
2.5, 10, and 50 times the maximum recommended human dose (MRHD) of 10 mg/day (8
mg zolpidem base) on mg/m&su2; basis. In rats, these doses are
approximately 5, 20, and 100 times the MRHD on a mg/m&su2; basis. No
evidence of carcinogenic potential was observed in mice. In rats, renal tumors
(lipoma, liposarcoma) were seen at the mid-and high doses.
Mutagenesis
Zolpidem was negative in in vitro (bacterial reverse
mutation, mouse lymphoma, and chromosomal aberration) and in vivo (mouse
micronucleus) genetic toxicology assays.
Impairment of Fertility
Oral administration of zolpidem (doses of 4, 20, and 100
mg base/kg) to rats prior to and during mating, and continuing in females
through postpartum day 25, resulted in irregular estrus cycles and prolonged
precoital intervals at the highest dose tested. The no-effect dose for these
findings is approximately 24 times the MRHD on a mg/m&su2; basis. There
was no impairment of fertility at any dose tested.
Use In Specific Populations
Pregnancy
Pregnancy Category C
There are no adequate and well-controlled studies of
Edluar in pregnant women. Studies in children to assess the effects of prenatal
exposure to zolpidem have not been conducted; however, cases of severe neonatal
respiratory depression have been reported when zolpidem was used at the end of
pregnancy, especially when taken with other CNS-depressants. Children born to
mothers taking sedative-hypnotic drugs may be at risk for withdrawal symptoms
during the postnatal period. Neonatal flaccidity has also been reported in
infants born to mothers who received sedative-hypnotic drugs during pregnancy.
Edluar should be used during pregnancy only if the potential benefit outweighs
the potential risk to the fetus.
Administration of zolpidem to pregnant rats and rabbits
resulted in adverse effects on offspring development at doses greater than the
maximum recommended human dose (MRHD) of 10 mg/day (approximately 8 mg/day
zolpidem base); however, teratogenicity was not observed.
When zolpidem was administered at oral doses of 4, 20,
and 100 mg base/kg to pregnant rats during the period of organogenesis,
dose-related decreases in fetal skull ossification occurred at all but the
lowest dose, which is approximately 5 times the MRHD on a mg/m&su2; basis.
In rabbits treated during organogenesis with zolpidem at oral doses of 1, 4,
and 16 mg base/kg, increased embryo-fetal death and incomplete fetal skeletal
ossification occurred at the highest dose. The no-effect dose for embryo-fetal
toxicity in rabbits is approximately 10 times the MRHD on a mg/m&su2; basis.
Administration of zolpidem to rats at oral doses of 4, 20, and 100 mg base/kg
during the latter part of pregnancy and throughout lactation produced decreased
offspring growth and survival at all but the lowest dose, which is
approximately 5 times the MRHD on a mg/m&su2; basis.
Labor And Delivery
Edluar has no established use in labor and delivery.
Nursing Mothers
Zolpidem is excreted in human milk. Caution should be
exercised when Edluar is administered to a nursing woman.
Pediatric Use
Edluar is not recommended for use in children. Safety and
effectiveness in pediatric patients have not been established in pediatric
patients below the age of 18.
In an 8-week controlled study in 201 pediatric patients
(aged 6-17 years) with insomnia associated with attention-deficit/hyperactivity
disorder (ADHD), an oral solution of zolpidem tartrate dosed at 0.25mg/kg at
bedtime did not decrease sleep latency compared to placebo. Ten patients on
zolpidem (7.4%) discontinued treatment due to an adverse reaction.
Psychiatric and nervous system disorders comprised the
most frequent ( > 5%) treatment emergent adverse reactions observed with
zolpidem versus placebo and included dizziness (23.5% vs. 1.5%), headache
(12.5% vs. 9.2%), and hallucinations reported in 7% of the pediatric patients
who received zolpidem; none of the pediatric patients who received placebo
reported hallucinations.
Geriatric Use
A total of 154 patients in U.S. controlled clinical
trials and 897 patients in non-U.S. clinical trials who received oral zolpidem
were ≥ 60 years of age. For a pool of U.S. patients receiving zolpidem
tartrate at doses of ≤ 10 mg or placebo, there were three adverse events
occurring at an incidence of at least 3% for zolpidem and for which the
zolpidem incidence was at least twice the placebo incidence (i.e., they could
be considered drug-related).
| Adverse Event |
Zolpidem |
Placebo |
| Dizziness |
3% |
0% |
| Drowsiness |
5% |
2% |
| Diarrhea |
3% |
1% |
A total of 30/1,959 (1.5%) non-U.S. patients receiving
zolpidem tartrate reported falls, including  28/30 (93%) who were ≥ 70
years of age. Of these 28 patients, 23 (82%) were receiving zolpidem doses > 10 mg. A total of 24/1,959 (1.2%) non-U.S.
patients receiving zolpidem reported confusion, including 18/24 (75%) who were
≥ 70 years of age. Of these 18 patients, 14 (78%) were receiving zolpidem
doses > 10 mg.
The dose of Edluar in elderly
patients is 5 mg to minimize adverse effects related to impaired motor and/or
cognitive performance and unusual sensitivity to sedative/hypnotic drugs.
Gender Difference In Pharmacokinetics
Women clear zolpidem tartrate
from the body at a lower rate than men, Cmax and AUC parameters of zolpidem
were approximately 45% higher at the same dose in female subjects compared with
male subjects. Given the higher blood levels of zolpidem tartrate in women
compared to men at a given dose, the recommended dose of Edluar for adult women
is 5 mg, and the recommended dose for adult men is 5 or 10 mg.
In geriatric patients,
clearance of zolpidem is similar in men and women. The recommended dose of
Edluar in geriatric patients is 5 mg regardless of gender.
Dosage (Posology) and method of administration
Dosage In Adults
Use the lowest effective dose for the patient. The
recommended initial dose is 5 mg for women and either 5 or 10 mg for men, taken
only once per night immediately before bedtime with at least 7-8 hours
remaining before the planned time of awakening. If the 5 mg dose is not
effective, the dose can be increased to 10 mg. In some patients, the higher
morning blood levels following use of the 10 mg dose increase the risk of next
day impairment of driving and other activities that require full alertness. The total dose of Edluar should not exceed 10 mg
once daily immediately before bedtime.
The recommended initial doses for women and men are
different because zolpidem clearance is lower in women.
Special Populations
Elderly or debilitated patients may be especially
sensitive to the effects of zolpidem tartrate. Patients with hepatic
insufficiency do not clear the drug as rapidly as normal subjects. The
recommended dose of Edluar in both of these patient populations is 5 mg once
daily immediately before bedtime.
Use With CNS Depressants
Dosage adjustment may be necessary when Edluar is
combined with other CNS-depressant drugs because of the potentially additive
effects.
Administration
The effect of Edluar may be slowed by ingestion with or
immediately after a meal.
Edluar sublingual tablet should be placed under the
tongue, where it will disintegrate. The tablet should not be swallowed and the
tablet should not be taken with water.
Interaction with other medicinal products and other forms of interaction
CNS-depressants
Co-administration of zolpidem with other CNS depressants
increases the risk of CNS depression.
Zolpidem tartrate was evaluated in healthy volunteers in single-dose
interaction studies for several CNS drugs. Imipramine in combination with
zolpidem produced no pharmacokinetic interaction other than a 20% decrease in
peak levels of imipramine, but there was an additive effect of decreased
alertness. Similarly, chlorpromazine in combination with zolpidem produced no
pharmacokinetic interaction, but there was an additive effect of decreased
alertness and psychomotor performance.
A study involving haloperidol and zolpidem revealed no
effect of haloperidol on the pharmacokinetics or pharmacodynamics of zolpidem.
The lack of a drug interaction following single-dose administration does not
predict the absence of an effect following chronic administration.
An additive adverse effect on psychomotor performance
between alcohol and oral zolpidem was demonstrated.
Following five consecutive nightly doses at bedtime of
oral zolpidem tartrate 10 mg in the presence of sertraline 50 mg (17
consecutive daily doses, at 7:00 am, in healthy female volunteers), zolpidem Cmax
was significantly higher (43%) and Tmax was significantly decreased (-53%).
Pharmacokinetics of sertraline and N-desmethylsertraline were unaffected by
zolpidem.
A single-dose interaction study with zolpidem tartrate 10
mg and fluoxetine 20 mg at steady-state levels in male volunteers did not
demonstrate any clinically significant pharmacokinetic or pharmacodynamics
interactions. When multiple doses of zolpidem and fluoxetine were given at
steady-state and the concentrations evaluated in healthy females, an increase
in the zolpidem half-life (17%) was observed. There was no evidence of an
additive effect in psychomotor performance.
Drugs that Affect Drug metabolism via Cytochrome P450
Some compounds known to inhibit CYP3A may increase
exposure to zolpidem. The effect of inhibitors of other P450 enzymes on the
pharmacokinetics of zolpidem is unknown.
A single-dose interaction study with zolpidem tartrate 10
mg and itraconazole 200 mg at steady-state levels in male volunteers resulted
in a 34% increase in AUC0-∞ of zolpidem tartrate. There were no pharmacodynamics
effects of zolpidem detected on subjective drowsiness, postural sway, or
psychomotor performance.
A single-dose interaction study with zolpidem tartrate 10
mg and rifampin 600 mg at steady-state levels in female subjects showed
significant reductions of the AUC (-73%), Cmax (-58%), and T½ (-36%) of
zolpidem together with significant reductions in the pharmacodynamics effects
of zolpidem tartrate. Rifampin, a CYP3A4 inducer, significantly reduced the
exposure to and the pharmacodynamics effects of zolpidem.
A single-dose interaction study with zolpidem 5 mg and
ketoconazole, a potent CYP3A4 inhibitor, given as 200 mg twice daily for 2 days
increased Cmax of zolpidem (30%) and the total AUC of zolpidem (70%) compared
to zolpidem alone and prolonged the elimination half-life (30%) along with an
increase in the pharmacodynamics effects of zolpidem. Consideration should be
given to using a lower dose of zolpidem when ketoconazole and zolpidem are
given together.
Other Drugs with No Interactions with Zolpidem
A study involving cimetidine/zolpidem tartrate and
ranitidine/zolpidem tartrate combinations revealed no effect of either drug on
the pharmacokinetics or pharmacodynamics of zolpidem.
Zolpidem tartrate had no effect on digoxin
pharmacokinetics and did not affect prothrombin time when given with warfarin
in healthy subjects.