Slightly off topic, I have a friend that used expired sun screen at high altitude and paid the price. His face burned, blistered and peeled 3 times. His lips seven times.
Sun cream often has a very short shelf-life, around 6 months. So this is interesting but confirms what I'd read.
Usually, medications lose their potency but don't become dangerous. Expired meds can be better than nothing. If you use the standard dosage, the worst that will likely happen is no effect. (It's tempting, then, to use a higher dose, but at that point you are just guessing and there's a real danger of overdose.)
What I'm saying is, it's not like eating food (eg rice) that's been cooked and left out for 24 hours. That does become actively dangerous. Germs grow in it.
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