I've had a bit of a fright, from mixing up my pills for a couple of days.
Being on a long-term course of medication, I got used to the shape and colours of my pills. I changed pharmacies, from the busy one nearest the surgery, to a small independent with longer opening hours and no long queues. I've noticed they chop and change their suppliers, and had some problems with Teva Levothyroxine, but it had lodged in my head that pills have standardized shapes and colours, as an aid to identification. I'd noticed a recent antibiotic had almost the same colours and shape as Ramipril, but is larger. It struck me that more effort could've been put into the design. And "horse-pill" size antibiotics used to cause me considerable difficulties in swallowing them.
But this week's problem was when I started a new pack of an alpha-blocker and didn't notice it had changed from what drugs.com calls a capsule shape, to round ones, similar enough to the diuretic I take to muddle them and take two and a half times the dose of alpha blocker.
Checking at drugs.com shows quite a range of shapes and colours for this drug, without the standardization I'd expected, so I'll take care to be more observant in future!