Frank Ross Pharmacies have been providing Kolkata with medicines since 1906. While all the outlets are open from 8 AM to 10 PM, if you have a middle-of-the-night emergency you can make your way to the head of the 5-point crossing of Shyambazar {where the Bidhan Sarani is} or any of the pharmacies attached to the hospitals as they are open through the day and night. Find the outlet closest to you here. They also have a delivery system for no extra charge. You can place your order by calling 6666 6666 or by downloading the app.