Kangning Herbal Hall, a local brand, I know two, one is near KFC on Qianjin Road, and the other is in Henderson Mall on Yima Road, but the business is not so good. It seems that it is run by foreigners.
There are 3-4 Maiwanjia Medicines, but they are not in a prosperous area and don't know much about them.
There are also Fumanxiang chain pharmacies, but most of them are family-run or brand-leased. It was ok in Weinan a few years ago.
Weinan Nanjing West Road is a drug wholesale, and many people buy it in Xinglin Medicine, which may be a habit.
Generally speaking, Weinan has no real brand chain.
I live near Guo Mao and often pass by these pharmacies. The above is my personal opinion, I hope I can help you!