Eye gtts. From $90 to $400 in one day.

There is absolutely no sane explanation for this.  A small bottle of eye drops at $90 was bad enough but to have it jump to $400?  Speak up, drug manufacturers,  everyone would like to hear how you justify this.  A daughter today had to tell her mother about the price jump.  I think the mother turned it down but am not sure.  Is the deep, bottom line really all about the profit you are making?...............marge.