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  • Title: Treatment of tension-type headache with tizanidine hydrochloride: its efficacy and relationship to the plasma MHPG concentration.
    Author: Shimomura T, Awaki E, Kowa H, Takahashi K.
    Journal: Headache; 1991 Oct; 31(9):601-4. PubMed ID: 1774177.
    Abstract:
    Seventy-eight patients with tension-type headache (TH) were treated with tizanidine hydrochloride (tizanidine). Plasma 3-methoxy-4-hydroxyphenylglycol (MHPG) and serum free fatty acids (FFA) levels in these patients were determined before the treatment with tizanidine. Eighteen healthy volunteers composed the control group. Four weeks after the treatment with tizanidine 24 (31%) of 78 patients showed excellent improvement (excellent group); 28 (35%) showed moderate improvement (moderate group); 18 (23%) showed mild improvement (mild group); 7 (10%) showed no improvement and one (1%) showed worsening of her headache (no change and worsened group). The plasma MHPG levels in the excellent group were significantly higher than in the other groups, including the control group. The serum FFA levels in the excellent group were significantly higher than in the controls. In this study, 66% of the patients reported improvement in their headaches. Some patients with TH had high plasma MHPG levels and these patients in particular showed excellent improvement after the administration of tizanidine. Though there may be a placebo response to some extent, the clinical usefulness of tizanidine for TH seems to be excellent. Further study is necessary concerning the pharmacological effect of tizanidine and plasma MHPG levels in patients with TH.
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