First of all, as long as the chemicals are qualified, the difference is very small. It can be said that the vast majority of patients are equivalent, you can rest assured. But in general, the domestic price difference should not exceed 50%. Are you sure you've seen it clearly? Wanjie's seems to be 10mg, and Shenyang's seems to be 20mg. The medicine in the hospital is definitely much more expensive than that in the pharmacy.
As for the recommendation of cimetidine, there is no doubt that it is a layman. Who is still using cimetidine now? There are great side effects.