Since your brother is taking parvon capsules and some injections, along with tobacco and alcohol, he is most probably dependent on opioids, alcohol and tobacco. He may also have developed complications of intravenous drug use
. He will require admission in a de-addiction clinic for detoxification
and further management. Try to raise his motivation levels. If he does not want to quit himself, it becomes difficult for others to help him. Only medicines are not enough. He will also need a lot of support and help from his family and doctor.