An old tried and true drug is in short supply around the globe. Supplies are due, sourced from Germany, I read. Lots of 400 tablets were the usual number dispensed and maybe that is wasteful and led to the shortage although a dose may be 1 tablet to up round 10 tablets a day.
So, in some other instances where a vital replacement medication is of great importance there would be a problem if supplies failed. Such is life. eHealth to the rescue!