The suppository should be stored in a standing position with the tip (rounded side) facing down basically in an environment of 1-30℃.
There is a reason for this. In the manufacturing process, there is a little space at the top of the container of the suppository. Suppositories soften when the storage temperature exceeds 30℃, and dissolve and become liquid when the temperature rises further. If they are not stored in the correct orientation, this space may move and cause deformation.
For this reason, many suppositories have an "Upper" mark on the outer box so that you can know which side should be upper from the outside of the box. Check the mark and store properly.
The image shows that the suppository should be stored in a standing position with the tip facing down.
Do not store in a freezer where the temperature is below 0℃.