JAC (the branches run by individuals) are also stocking other brand generics, so maybe you got one of those. I specifically ask for 'sarkari wali' to get JA ones.
I got SAME BRAND, first for Rs.50/- and after 10 days for Rs.40/- (mfg.date/batch/brand name/expiry date etc. were same on both packet). Few People who run Jan Aushadhi found their way to increase price to incase profit margin.
