Flurazepam chemical structure
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Flurazepam

Flurazepam (marketed under the brand name Dalmane®) is a drug which is a benzodiazepine derivative. It possesses anxiolytic, anticonvulsant, sedative and skeletal muscle relaxant properties. more...

It has the longest half-life of all of the benzodiazepines (40-250 hours), and may stay in the bloodstream for up to four days. more...

It is used for short-term treatment of patients with insomnia. more...

The most common adverse effects are dizziness, drowsiness, lightheadedness and ataxia. more...

Flurazepam is a Schedule IV drug under the Convention on Psychotropic Substances. more...

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Anti-insomnia drugs
From Gale Encyclopedia of Medicine, 4/6/01 by Nancy Ross-Flanigan

Definition

Anti-insomnia drugs are medicines that help people fall asleep or stay asleep.

Purpose

Physicians prescribe anti-insomnia drugs for short-term treatment of insomnia -- a sleep problem in which people have trouble falling asleep or staying asleep or wake up too early and can't go back to sleep. These drugs should be used only for occasional treatment of temporary sleep problems and should not be taken for more than a week or two at a time. People whose sleep problems last longer than this should see a physician. Their sleep problems could be a sign of another medical problem.

Description

The anti-insomnia drug described here, zolpidem (Ambien), is a classified as a central nervous system (CNS) depressant. CNS depressants are medicines that slow the nervous system. Physicians also prescribe medicines in the benzodiazepine family, such as flurazepam (Dalmane), quazepam (Doral), triazolam (Halcion), estazolam (ProSom), and temazepam (Restoril), for insomnia. Benzodiazepine drugs are described in the essay on antianxiety drugs.

Zolpidem is available only with a physician's prescription and comes in tablet form.

Recommended dosage

The recommended dose for adults is 5-10 mg just before bedtime. The medicine works quickly, often within 20 minutes, so it should be taken right before going to bed.

For older people and others who may be more sensitive to the drug's effects, the recommended starting dosage is 5 mg just before bedtime.

Never take more than 10 mg of zolpidem in one 24-hour period. Overdoses can lead to excessive sleepiness or coma.

Zolpidem may be taken with food or on an empty stomach, but it may work faster when taken on an empty stomach. Check with a physician or pharmacists for instructions on how to take the medicine.

Precautions

Zolpidem is meant only for short-term treatment of insomnia. If sleep problems last more than 7-10 days, check with a physician. Longer-lasting sleep problems could be a sign of another medical problem. Also, this drug may lose its effectiveness when taken every night for more than a few weeks.

Some people feel drowsy, dizzy, confused, lightheaded, or less alert the morning after they have taken zolpidem. The medicine may also cause clumsiness, unsteadiness, double vision, or other vision problems the next day. For these reasons, anyone who takes these drugs should not drive, use machines or do anything else that might be dangerous until they have found out how zolpidem affects them.

This medicine has caused cause behavior changes in some people, similar to those seen in people whose behavior changes when they drink alcohol. Examples include giddiness and rage. More extreme changes, such as confusion, agitation, and hallucinations, also are possible. Anyone who starts having strange or unusual thoughts or behavior while taking this medicine should get in touch with his or her physician.

Zolpidem and other sleep medicines may cause a special type of temporary memory loss, in which the person does not remember what happens between the time they take the medicine and the time its effects wear off. This is usually not a problem, because people go to sleep right after taking the medicine and stay asleep until its effects wear off. But it could be a problem for anyone who has to wake up before getting a full night's sleep (7-8 hours). In particular, travelers should not take this medicine on airplane flights of less than 7-8 hours.

Because zolpidem works work on the central nervous system, it may add to the effects of alcohol and other drugs that slow down the central nervous system, such as antihistamines, cold medicine, allergy medicine, medicine for seizures, tranquilizers, some pain relievers, and muscle relaxants. Zolpidem may also add to the effects of anesthetics, including those used for dental procedures. The combined effects of zolpidem and alcohol or other CNS depressants (drugs that slow the central nervous system) can be very dangerous, leading to unconsciousness or even death. People who take zolpidem should not drink alcohol and should check with their physicians before taking any other CNS depressant. Anyone who shows signs of an overdose or of the effects of combining zolpidem drugs with alcohol or other drugs should have immediate emergency help. Warning signs include severe drowsiness, severe nausea or vomiting, breathing problems, and staggering.

Anyone who takes zolpidem for more than 1-2 weeks should not stop taking it without first checking with a physician. Stopping the drug abruptly may cause withdrawal symptoms, such as vomiting, cramps, and unpleasant feelings. Gradual tapering may be necessary.

Older people may be more sensitive to the effects of zolpidem. This may increase the chance of side effects, such as confusion, and may also increase the risk of falling.

In people with breathing problems, zolpidem may worsen the symptoms.

Special conditions

People with certain other medical conditions or who are taking certain other medicines can have problems if they take zolpidem. Before taking this medicine, be sure to let the physician know about any of these conditions:

Allergies

Anyone who has had unusual reactions to zolpidem in the past should let his or her physician know before taking the drugs again. The physician should also be told about any allergies to foods, dyes, preservatives, or other substances.

Pregnancy

Women who are pregnant or who may become pregnant should check with their physicians about the safety of using zolpidem during pregnancy.

Breastfeeding

Women who are breastfeeding should check with their physicians before using zolpidem.

Other medical conditions

Before using zolpidem, people with any of these medical problems should make sure their physicians are aware of their conditions:

  • Chronic lung diseases such as emphysema, asthma, or chronic bronchitis
  • Liver disease
  • Kidney disease
  • Current or past alcohol or drug abuse
  • Depression
  • Sleep apnea.
Use of certain medicines

Taking zolpidem with certain other drugs may affect the way the drugs work or may increase the chance of side effects.

Side effects

The most common minor side effects are daytime drowsiness or a "drugged" feeling, vision problems, memory problems, nightmares or unusual dreams, vomiting, nausea, abdominal or stomach pain, diarrhea, dry mouth, headache, and general feeling of discomfort or illness. These problems usually go away as the body adjusts to the drug and do not require medical treatment.

More serious side effects are not common, but may occur. If any of the following side effects occur, check with the physician who prescribed the medicine as soon as possible:

  • Confusion
  • Depression
  • Clumsiness or unsteadiness.

Patients who take zolpidem may notice side effects for several weeks after they stop taking the drug. They should check with their physicians if these or other troublesome symptoms occur:

  • Agitation, nervousness, feelings of panic
  • Uncontrolled crying
  • Worsening of mental or emotional problems
  • Seizures
  • Tremors
  • Lightheadedness
  • Sweating
  • Flushing
  • Nausea or abdominal or stomach cramps
  • Muscle cramps
  • Unusual tiredness or weakness.

Other rare side effects may occur. Anyone who has unusual symptoms after taking zolpidem should get in touch with his or her physician.

Interactions

Zolpidem may interact with other medicines. When this happens, the effects of one or both of the drugs mayc hange or the risk of side effects may be greater. Anyone who takes zolpidem should let the physician know all other medicines he or she is taking. Among the drugs that may interact with zolpidem are:

  • Other central nervous system (CNS) depressants such as medicine for allergies, colds, hay fever, and asthma; sedatives; tranquilizers; prescription pain medicine; muscle relaxants; medicine for seizures; barbiturates; and anesthetics.
  • The major tranquilizer chlorpromazine (Thorazine)
  • Tricyclic antidepressants such as imipramine (Tofranil) and amitriptyline (Elavil).

Key Terms

Asthma
A disease in which the air passages of the lungs become inflamed and narrowed.
Bronchitis
Inflammation of the air passages of the lungs.
Emphysema
A lung disease in which breathing becomes difficult.
Hallucination
A false or distorted perception of objects, sounds, or events that seems real. Hallucinations usually result from drugs or mental disorders.
Sleep apnea
A condition in which a person temporarily stops breathing during sleep.
Withdrawal symptoms
A group of physical or mental symptoms that may occur when a person suddenly stops using a drug to which he or she has become dependent.

Further Reading

Gale Encyclopedia of Medicine. Gale Research, 1999.

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