This invention provides a method of treating a patient afflicted with multiple sclerosis or presenting a clinically isolated syndrome comprising administering to the patient laquinimod as an add-on therapy to or in combination with glatiramer acetate. This invention also provides a package and a pharmaceutical composition comprising laquinimod and glatiramer acetate for treating a patient afflicted with multiple sclerosis or presenting a clinically isolated syndrome. This invention also provides laquinimod for use as an add-on therapy or in combination with glatiramer acetate in treating a patient afflicted with multiple sclerosis or presenting a clinically isolated syndrome. This invention further provides use of laquinimod and glatiramer acetate in the preparation of a combination for treating a patient afflicted with multiple sclerosis or presenting a clinically isolated syndrome.