What serious side effects are possible with tizanidine?

Possible serious side effects of tizanidine (Zanaflex), for which you should call your doctor right away, include:
  • lack of energy or extreme tiredness
  • pain in the upper right side of your stomach
  • yellowing of your skin or eyes
  • seeing or hearing things that aren't there
  • loss of appetite
If your doctor prescribes tizanidine, which is used to treat multiple sclerosis (MS), ask him or her for a complete list of possible side effects so you know what to watch out for and when to call. If you have any worrisome side effects or other concerns while taking tizanidine, discuss them with your doctor.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.