Hi, sorry but Zoloft isn't an OTC drug. You will have to look up for a psychiatrist in Mumbai to get a prescription. Or you can get in touch with your previous doctor who diagnosed you with depression and had prescribed Zoloft in the first place as he can provide a credible certificate stating you have depression. However, the certificate also depends on for what purpose would you be using it. Online prescriptions are not available so you will have to see a doctor in person. I should add as a disclaimer that any drug intake should be administered and monitored systematically by a professional or else it could lead to health hazards. Hope this information helps you out.