Inclusion criteria:
Patients with definitive diagnosis of MS aged 18 to 50 years
Be in the offensive phase (at least one month after the attack)
Disability rate according to EDSS criteria is between 1 to 5.5.
Fatigue is 4 or higher according to the FSS criteria.
If interferon is used to treat multiple sclerosis, at least 6 months have passed since the start of this drug.
Exclusion criteria:
History of corticosteroid use during the month before treatment
Taking supplements or drugs with antioxidant properties such as vitamins E and C, zinc, melatonin
Taking medications that cause fatigue and drowsiness (such as benzodiazepines, tricyclic antidepressants,sedatives, anticonvulsants)
Taking stimulant drugs, amantadine, dopaminergic drugs
Pregnancy and lactation
History of NAC allergy or any side effects
Existence of depression (according to Beck questionnaire)
Accompanying medical conditions that can cause fatigue, such as: sleep disorders, heart failure, anemia, hypothyroidism and ....