Originally Posted by mrsD

no effect on other drugs...
They work predominately on a local level.

Some people may be hypersensitive to them, but that is not
common.

I often get by with 1/2 a one. They can be cut...and keep in airtight ziploc so they won't dry out, if you cut them.

They don't stick well if you sweat alot.
Remove oils, or any soap residue before applying to clean dry skin (intact skin).

The biggest down side is that they don't stick well.