I found this on google:
The formulation of this migraine medication was changed recently, allowing it to be absorbed into the bloodstream faster. This made the medicine more moisture-sensitive, requiring an improved moisture barrier in the blister packaging material. (Imitrex has been packaged in blisters throughout its nine-year history to enhance its portability.)
To get the needed moisture barrier, GSK switched to an aluminum laminated cold-form blister material, supplied by Alcan. One of the biggest challenges proved to be meeting the child-resistance requirements— a tooth puncture counts as an “opening” even though a child doesn’t get to the pill. The package had to be hard for children to get into but easy enough for older consumers or people in the midst of a migraine attack, which can rob the ability to focus.
A new version of the Imitrex package is now making its way through the marketplace and features easier access combined with child resistance. GSK prints easy-to-follow opening instructions for adults on a trifold blister card, which doubles as a child-resistant feature.
It's a UK site, so it's possible they're not talking about the same packaging. Still, now that I know the medication is water sensitive I can't decant, can I?
And then this:
According to GSK’s Manager of Product Communications, Robin Gaitens, the incorporation of rapid-release technology doesn’t impact the tablet manufacturing process or cause any challenges in redeveloping the formulation. However, the reformulated tablets, which are now hitting pharmacy shelves, are packaged in a new punch-out card configuration, replacing the original Imitrex peel-out packaging (see Figure 1). The new packaging is intended to give patients easier access to medication, avoiding the fumbling often associated with the use of a peel-back cover—an important consideration for patients already suffering from migraine symptoms such as lack of coordination and unclear thought processes.
I admit that this last prescription is a shade easier than the last packaging, but neither of them are easy. It's horrible.