Thanks for query,
It seems that your relative is having chronic depression
resulting in suicidal tendency.
You have to take this seriously and consult psychiatrist
as early as possible.
Initially it will take 10-15 days for medicine to work so you continue the medicine.
Once medicine will start working he will feel better.
Then he may require counseling with psychologist
So without changing doctors you continue the treatment of expert.
If there is problem or no improvement ask your doctor.
Ok and bye.