Data estimated by 米内网 (menet.com), which was formerly 中国医药经济信息网, created in 1997 by (formerly) CFDA Southern Research Institute.
According to the data, the overall end market sales grew 6.3% to 1713 billion yuan (or ~$250 billion) in 2018.
Retailer channels continues to grew at above-GDP rate (7.5% in 2018).
The data is not including sales in private hospitals/clinics, etc. The overall sales would be 2 trillion yuan for 2018 if included.