Relaxazone

Generic Name: chlorzoxazone
Other Brand Names: Eze D.S., Paraflex, Parafon Forte DSC, Remular, Remular-S, Strifon Fort, chlorzoxazone

What is chlorzoxazone?

Chlorzoxazone is a muscle relaxant. It works by blocking nerve impulses (or pain sensations) that are sent to your brain.

Chlorzoxazone is used, along with rest and physical therapy, to treat injuries and other painful muscular conditions.

Chlorzoxazone may also be used for purposes other than those listed in this medication guide.

Uses Side Effects Precautions Interactions Overdose
What should I discuss with my healthcare provider before taking chlorzoxazone?

Before taking chlorzoxazone, tell your doctor if you have liver disease. You may need a lower dose or special monitoring during therapy.

It is not known whether chlorzoxazone will harm an unborn baby. Do not take chlorzoxazone without first talking to your doctor if you are pregnant.

It is also not known whether chlorzoxazone passes into breast milk. Do not take chlorzoxazone without first talking to your doctor if you are breast-feeding a baby.

How should I take chlorzoxazone?

Take chlorzoxazone exactly as directed by your doctor. If you do not understand these directions, ask your pharmacist, nurse, or doctor to explain them to you.

Take each dose with a full glass of water.

Chlorzoxazone is usually taken three or four times a day. Follow your doctor’s instructions.

Store chlorzoxazone at room temperature away from moisture and heat.

What happens if I miss a dose of chlorzoxazone?

Take the missed dose as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and take only your next regularly scheduled dose. Do not take a double dose of this medication.

Where can I get more information about chlorzoxazone?
Your pharmacist has information about chlorzoxazone written for health professionals that you may read.
What are the possible side effects of chlorzoxazone?

If you experience any of the following serious side effects, stop taking chlorzoxazone and seek emergency medical attention:

  • an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives);

  • liver damage (yellowing of the skin or eyes, nausea, abdominal pain or discomfort, unusual bleeding or bruising, severe fatigue); or

  • stomach damage (black, bloody, or tarry stools, blood in vomit).

Other, less serious side effects may be more likely to occur. Continue to take chlorzoxazone and talk to your doctor if you experience

  • drowsiness, dizziness, or lightheadedness;

  • discolored urine; or

  • a rash or unusual bruising.

Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.

What is the most important information I should know about chlorzoxazone?

Chlorzoxazone may cause dizziness or drowsiness. Use caution when driving or performing other hazardous activities until you know how this medication affects you. If you experience dizziness or drowsiness, avoid these activities.

Use alcohol cautiously. Alcohol may increase drowsiness and dizziness while you are taking chlorzoxazone.

What should I avoid while taking chlorzoxazone?

Use caution when driving, operating machinery, or performing other hazardous activities. Chlorzoxazone may cause dizziness or drowsiness. If you experience dizziness or drowsiness, avoid these activities.

Use alcohol cautiously. Alcohol may increase drowsiness and dizziness while you are taking chlorzoxazone.

What other drugs will affect chlorzoxazone?

Many drugs can increase the effects of chlorzoxazone, which can lead to heavy sedation. Before taking this medication, tell your doctor if you are taking any of the following medicines:

  • antihistamines such as brompheniramine (Dimetane, Bromfed, others), chlorpheniramine (Chlor-Trimeton, Teldrin, others), azatadine (Optimine), clemastine (Tavist), and many others;

  • narcotics (pain killers) such as meperidine (Demerol), morphine (MS Contin, MSIR, others), propoxyphene (Darvon, Darvocet), hydrocodone (Lorcet, Vicodin), oxycodone (Percocet, Percodan), fentanyl (Duragesic), and codeine (Fiorinal, Fioricet, Tylenol #3, others);

  • sedatives such as phenobarbital (Solfoton, Luminal), amobarbital (Amytal), and secobarbital (Seconal);

  • phenothiazines such as chlorpromazine (Thorazine), fluphenazine (Prolixin), mesoridazine (Serentil), perphenazine (Trilafon), prochlorperazine (Compazine), thioridazine (Mellaril), and trifluoperazine (Stelazine); or

  • antidepressants such as doxepin (Sinequan), imipramine (Tofranil), nortriptyline (Pamelor), fluoxetine (Prozac), paroxetine (Paxil), sertraline (Zoloft), phenelzine (Nardil), and tranylcypromine (Parnate).

Drugs other than those listed here may also interact with chlorzoxazone. Talk to your doctor and pharmacist before taking any prescription or over-the-counter medicines.

What happens if I have an overdose of chlorzoxazone?

Seek emergency medical attention.

Symptoms of a chlorzoxazone overdose include nausea, vomiting, diarrhea, drowsiness, dizziness, extreme weakness, and irregular breathing.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed. Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
Content provided by Multum - Last Updated 2/11/2008