The present invention is directed to a method of treating action tremor or severe essential tremor. Action tremor includes essential tremor, postural tremor, drug-induced or toxic tremor, primary orthostatic tremor, dystonic tremor, neuropathic tremor, and cerebellar tremor. The method comprises administering to a subject a pharmaceutical composition comprising an effective amount of zonisamide, or a pharmaceutically acceptable salt thereof. The methods of the present invention are useful in reducing symptoms of tremor. The compounds of the present method can also be used in conjunction with other therapeutic agents commonly used to treat tremor thus enhancing the therapeutic effect of treating tremor.