Generic Name: tizanidine (tye ZAN i deen)
Brand Names: Zanaflex
Medically reviewed on Apr 5, 2017
What is Zanaflex?
Zanaflex (tizanidine) is a short-acting muscle relaxer. It works by blocking nerve impulses (pain sensations) that are sent to your brain.
Zanaflex is used to treat spasticity by temporarily relaxing muscle tone.
Zanaflex may also be used for purposes not listed in this medication guide.
Zanaflex is a short-acting medication that should be taken only for daily activities that require relief from muscle spasticity.
You should not take tizanidine if you are also taking fluvoxamine (Luvox) or ciprofloxacin (Cipro).
Do not use Zanaflex at a time when you need muscle tone for safe balance and movement during certain activities. In some situations, it may endanger your physical safety to be in a state of reduced muscle tone.
Switching between Zanaflex tablets and capsules, or changing the way you take it with regard to eating, can cause an increase in side effects or a decrease in therapeutic effect. Follow your doctor's instructions carefully. After making any changes in how you take Zanaflex, contact your doctor if you notice any change in how well the medicine works or if it causes increased side effects.
Do not take more than three doses (36 mg) of tizanidine in a 24-hour period. Too much of tizanidine can damage your liver. Cold or allergy medicine, narcotic pain medicine, sleeping pills, other muscle relaxers, and medicine for seizures, depression or anxiety can add to sleepiness caused by tizanidine. Tell your doctor if you need to use any of these other medicines together with Zanaflex.
Avoid drinking alcohol. It can increase some of the side effects of tizanidine.
Before taking this medicine
You should not use Zanaflex if you are allergic to tizanidine, or if:
you also take the antidepressant fluvoxamine (Luvox); or
you also take the antibiotic ciprofloxacin (Cipro).
To make sure Zanaflex is safe for you, tell your doctor if you have:
kidney disease; or
low blood pressure.
It is not known whether Zanaflex will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.
It is not known whether tizanidine passes into breast milk or if it could harm a nursing baby. Tell your doctor if you are breast-feeding a baby.
How should I take Zanaflex?
Take Zanaflex exactly as it was prescribed for you. Follow all directions on your prescription label. Your doctor may occasionally change your dose to make sure you get the best results. Do not use this medicine in larger or smaller amounts or for longer than recommended.
In most cases you may take Zanaflex up to 3 times in one day if needed. Allow 6 to 8 hours to pass between doses.
You may take Zanaflex with or without food, but take it the same way each time. Switching between taking tizanidine with food and taking it without food can make the medicine less effective or cause increased side effects.
Switching between Zanaflex tablets and capsules can also cause changes in side effects or how well the medicine works.
Taking the tablets with food can increase your blood levels of tizanidine.
Taking the capsules with food can decrease your blood levels of tizanidine.
Follow your doctor's instructions carefully. After making any changes in how you take Zanaflex, contact your doctor if you notice any change in side effects or in how well the medicine works.
Zanaflex is a short-acting medication, and its effects will be most noticeable between 1 and 3 hours after you take it. You should take this medicine only for daily activities that require relief from muscle spasms.
Do not take more than three doses (36 mg) in a 24-hour period. Too much of this medicine can damage your liver.
You will need frequent blood tests to check your liver function.
If you stop using Zanaflex suddenly after long-term use, you may have withdrawal symptoms such as dizziness, fast heartbeats, tremors, and anxiety. Ask your doctor how to safely stop using this medicine.
Store at room temperature away from moisture and heat.
What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
Overdose symptoms may include weakness, drowsiness, confusion, slow heart rate, shallow breathing, feeling light-headed, or fainting.
What should I avoid while taking Zanaflex?
Do not use Zanaflex at a time when you need muscle tone for safe balance and movement during certain activities. In some situations, it may be dangerous for you to have reduced muscle tone.
Drinking alcohol with this medicine can cause side effects.
This medicine may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert. Avoid getting up too fast from a sitting or lying position, or you may feel dizzy. Get up slowly and steady yourself to prevent a fall.
Zanaflex side effects
Get emergency medical help if you have signs of an allergic reaction to Zanaflex: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
a light-headed feeling, like you might pass out;
weak or shallow breathing;
confusion, hallucinations; or
pain or burning when you urinate.
Common Zanaflex side effects may include:
drowsiness, dizziness, weakness;
dry mouth, trouble speaking;
abnormal liver function tests;
runny nose, sore throat;
vomiting, constipation; or
uncontrolled muscle movements.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
Zanaflex dosing information
Usual Adult Dose for Muscle Spasm:
Initial dose: 2 mg orally every 6 to 8 hours as needed
-Peak effects occur in approximately 1 to 2 hours and last for 3 to 6 hours; treatment can be repeated as needed to a maximum of 3 doses in 24 hours; gradually increase dose by 2 to 4 mg at intervals of 1 to 4 days until satisfactory reduction of muscle tone is achieved.
Maximum single dose: 16 mg
Maximum daily dose: 36 mg in 24 hours
-Clinically significant differences in absorption are expected between capsules and tablets when taken with or without food; these differences could result in changes in efficacy and tolerability.
-Once a formulation is decided on and a decision is made to take with or without food, this regimen should not be altered.
Use: Management of spasticity.
What other drugs will affect Zanaflex?
Taking Zanaflex with other drugs that make you sleepy or slow your breathing can cause dangerous side effects or death. Ask your doctor before taking a sleeping pill, narcotic pain medicine, prescription cough medicine, a muscle relaxer, or medicine for anxiety, depression, or seizures.
Tell your doctor about all your current medicines and any you start or stop using, especially:
birth control pills;
an antibiotic - ciprofloxacin, gemifloxacin, levofloxacin, moxifloxacin, or ofloxacin;
blood pressure medicine - clonidine, guanfacine, methyldopa;
heart rhythm medicine - amiodarone, mexiletine, propafenone, verapamil; or
stomach acid medicine - cimetidine, famotidine.
This list is not complete. Other drugs may interact with tizanidine, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use Zanaflex only for the indication prescribed.
Copyright 1996-2018 Cerner Multum, Inc. Version: 3.01.
More about Zanaflex (tizanidine)
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- During Pregnancy
- Dosage Information
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- Drug class: skeletal muscle relaxants
- FDA Alerts (1)