Abstract: The disclosure is directed to pharmaceutical compositions comprising of Tizanidine or a pharmaceutically acceptable salt thereof which controllably modulate the onset of at least one secondary effect associated with Tizanidine administration. In embodiments, the pharmaceutical compositions comprise at least three components with different release characteristics: immediate release component; a first time, pulsatile release component; and a second population of time, pulsatile release component. The release characteristics of the pharmaceutical composition are such that the bedtime blood plasma concentrations control spasticity and allow the patient to have quality sleep, and the daytime blood plasma concentrations controls spasticity without unwanted secondary such as somnolence or sedation.