Important Changes in Zanaflex Labeling

Florence Cardinal Health Guide
  • Acorda Therapeutics and the FDA have informed healthcare professionals of changes to the CONTRAINDICATIONS and WARNINGS Sections of the product labeling for Zanaflex (tizanidine), a medication used for a variety of purposes including the relief of spasticity related to neurological disorders, as a treatment of restless legs syndrome associated with these diseases, by patients with fibromyalgia, and as a chronic headache and migraine preventive.

    In pharmacokinetic studies where tizanidine was coadministered with
    either fluvoxamine (the antidepressant Luvox) or ciprofloxacin (the
    antibiotic Cipro) (CYP1A2 inhibitors), the serum concentration of

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    tizanidine was significantly increased and potentiated its hypotensive
    and sedative effects. Although there are no clinical studies evaluating
    the effects of other CYP1A2 inhibitors on tizanidine, coadministration
    of tizanidine with other CYP1A2 inhibitors [zileuton (for asthma), other
    fluroquinolones, antiarrythmics, cimetidine (Tagamet), famotidine
    (pepcid), oral contraceptives, acyclovir (Zovirax) and ticlopidine
    (Ticlid)] should be avoided. If their use is clinically necessary, they
    should be used with caution.

    If you're taking Zanaflex (tizanidine) with any of the medications
    listed in the MedWatch warning, you may wish to consult your doctor
    about this issue. Do not discontinue your medications without consulting
    your physician.

    ____________
    Resources:

    MedWatch Safety Information. "Zanaflex (tizanidine hydrochloride)
    Tablets and Capsules.
    " April
    11, 2007.

    Healthcare Professional Letter. Acorda Therapeutics and the FDA.
    "Updated Safety Informaiton: Contraindications to the use of Tizanidine."

Published On: April 11, 2007