PROCEDURES
Following inclusion, blood samples (3 ml) were obtained from all patients, and the amount of valproic acid was determined using the high‐performance liquid chromatography method. In the experimental group, patients were given a 3‐mg melatonin tablet single dose daily (add‐on valproic acid) 1 h before bedtime and continued for 8 weeks (Verma et al., Diagram of study protocol