SUMMARY: Sometimes, things can kill your dog that you wouldn't expect to do so.
Yesterday i posted a link to the Top Ten reported poisons for dogs and cats. That doesn't mean that there aren't a lot of others. I'm surprised that I've never posted a list or link of poisons and toxins--at least, I just did a bunch of searching in my blog and am finding nothing. (Could be the search doesn't work well, too, of course.)
On this page are links to lists of some Poisonous Plants and Flowers, Toxic and Harmful Foods, Dangerous Chemicals, and Other Environmental Hazards. It doesn't list specific medications, just the general warning:
Hazards from Pharmaceuticals and More: There are some human medications that are safe for dogs, but many others can be seriously harmful to your dog. Even some veterinary drugs can be toxic if not used properly. Before medicating your dog, always contact your veterinarian for instructions. An accidental overdose can prove fatal depending on the substance. Also, remember that your dog might be curious and quite crafty when it comes to opening pill bottles. Keep ALL drugs, vitamins, herbs and supplements out of reach.Please do go through the lists; some might surprise you.
Here's a more complete list that's interactive: http://www.petpoisonhelpline.com/poisons/