Why people stop talking. Is it due to mental illness ?  Do we need to consult Psychiatrist ? How the medicine helps in overcome depression ?  Can people come out of depression without medicine ?  What is the alternate therapy to come out of depression ?
Hemlock of interest in talking to others can occur in depression. Its one of the symptom in depression.  There are various antidepressants which can definitely help in depression.  Since you are asking for other alternatives in treating depression you can go for psychotherapy (counselling). Here you need to meet a therapist regularly, may be once or twice in a week and the sessions will be held for about 45 mins to 1 hour per session.  And the no. Of sessions depends on each patient and the severity of the problem. You can try this option as it will help you for sure. Regards