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Tizanidine Patient Tips

Medically reviewed on Sep 17, 2017 by C. Fookes, BPharm

How it works

  • Tizanidine relaxes muscles by dampening down nerve impulses that are sent from spasming muscles along nerve fibers to the brain.
  • Tizanidine belongs to the class of medicines known as central alpha-2-adrenergic agonists. It also belongs to the group of medicines known as muscle relaxants.

Upsides

  • Effective at relaxing muscles (reduces muscles spasms).
  • May be used on an as-needed basis.
  • Generic tizanidine is available.

Downsides

If you are between the ages of 18 and 60, take no other medication or have no other medical conditions, side effects you are more likely to experience include:

  • Low blood pressure, drowsiness, dizziness, energy loss, and a dry mouth.
  • Has been associated with hallucinations and rarely psychosis in approximately 3% of people.
  • May not be suitable for people that rely on spasticity to sustain their posture and balance.
  • May cause a drop in blood pressure when going from a sitting or lying down position to standing. This may increase the risk of falls.
  • May affect a person's ability to drive or operate machinery. Alcohol should be avoided.
  • May cause withdrawal symptoms such as high blood pressure and a fast heartbeat if stopped abruptly after regular extended dosing (decrease dose slowly under a doctor's advice).
  • Not recommended to be taken by people with liver or kidney disease.
  • Seniors may be more susceptible to the side effects of tizanidine.
  • May interact with a number of other drugs including those metabolized by hepatic enzymes CYP1A2 (such as fluvoxamine, ciprofloxacin, some antiarrhythmics), and oral contraceptives. Alcohol increases the peak concentration of tizanidine and also the likelihood of side effects.
  • Liver enzymes (specifically aminotransferase)should be monitored when starting treatment and for at least one month after the maximum dosage is achieved.

Notes: In general, seniors or children, people with certain medical conditions (such as liver or kidney problems, heart disease, diabetes, seizures) or people who take other medications are more at risk of developing a wider range of side effects. For a complete list of all side effects, click here.

Bottom Line

Tizanidine is an effective muscle relaxant; however, it causes sedation and has a high risk of liver toxicity, so monitoring of liver enzymes is required.

Tips

  • Capsules may be opened and the contents sprinkled on food.
  • Taking with food increases absorption by 20% but slows time for effect. Can be taken with or without food, but should be dosed consistently (either with or without food).
  • Take tizanidine exactly as directed. Do not increase the dosage without your doctor's advice. Tizanidine tablets and capsules are not directly interchangeable; a dosage adjustment may be necessary (talk with your doctor).
  • Be careful when going from sitting or lying down position to standing as tizanidine may increase your risk of falls. Remove any fall hazards (such as loose rugs) from your home.
  • Seek immediate medical advice if you experience any worrying side effects including hallucinations or allergic-type reactions.
  • Do not stop taking tizanidine suddenly without your doctor's advice as high blood pressure and a fast heartbeat may result.
  • Effects are dose-related (the bigger the dose, the stronger the effect, but the more noticeable any side effects are).
  • Do not drink any alcohol while taking tizanidine.
  • Do not take any other medication, including medicines brought over-the-counter, in addition to tizanidine, without first checking with your doctor or pharmacist first to make sure they are compatible.

Response and Effectiveness

The effects of tizanidine peak within 1-2 hours and start to wear off within 3 to 6 hours. Because of this short duration of effect, tizanidine may be dosed on an "as needed" basis during times when muscle spasms are at their most severe.

References

Tizanidine [Package Insert]. Revised 08/2017 AvPak. https://www.drugs.com/pro/tizanidine.html

  • Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use tizanidine only for the indication prescribed.

  • Disclaimer: Every effort has been made to ensure that this information is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. This drug information does not endorse drugs, diagnose patients or recommend therapy. It is an informational resource designed 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. Drugs.com does not assume any responsibility for any aspect of healthcare administered with the aid of this information. 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.

Copyright 1996-2017 Drugs.com. Revision Date: 2017-09-17 22:58:31

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