Good news for all of you doing medical writing in India: a new professional organization is being formed for you. I found out about this through the Medical Writing Network (MWN), and you may be interested in checking out the AIMWA Web site.
This is from Natasha Das at the MWN: "While you are [at the web site], please do fill up the online membership form. Your name will be automatically added to the prospective members database. A representative from AIMWA's membership committee will get back to you."