A method of alleviating signs and symptoms of spasticity in human patient comprising orally administering to said human patients once in a day a controlled drug delivery system comprising an effective daily dose of baclofen or its pharmaceutically acceptable salt. The controlled drug delivery system is operable to produce a level of sedation lower than a sedation produced by three times a day immediate release tablets. A total daily dosage of the controlled release tablets and a total daily dosage of the three times a day immediate release tablets remain same.