What serious side effects are possible with tizanidine?

Stacy Wiegman, PharmD

Pharmacy

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.