The medication and it's dose is rightly prescribed. Nexito plus is combination of antidepressant escitalopram 5mg and sedative/anti-anxiety clonazepam 0.5mg. Kindly start taking the prescribed dose of drug.
From watever information you have provided, it seems like your brother might need atleast 10mg of escitalopram for his depression.
Next Steps
start taking the medicine in prescribed dosage.
Health Tips
if you are feeling excessive drowsiness during day, it can be due to clonazepam. then you can take plain escitalopram, than the combination with clonazepam in the morning