Why can't I buy nicotinic acid in the drugstore?

hello

Jinan Zhongxin Pharmaceutical Company has this medicine.

Nicotinic acid tablets 0.05g* 100 tablets.

Tianjin Li Sheng Pharmaceutical Co., Ltd. 2.80

Nicotinic acid tablets100 * 50mg

Shanghai Pharmaceutical (Group) Co., Ltd. Xinyi Pharmaceutical General Factory 2.80

Nicotinic acid injection 10*2ml:20mg

Jinan Yongning Pharmaceutical Co., Ltd. 8.40

Very cheap things, pharmacies sometimes close. You can go to a larger general hospital.