Much harder to get access to. If you want them to take off their clothes and rob them just use Scopolamine, hookers use it to rob Johns in South America. They synthesize the alkaloid from Angel’s Trumpet Brugmansia or if you’re in the states you can use Jimsonweed Datura stramonium, if you’re in Europe you can try your luck with Henbane Hyoscyamus niger.
Really what you’re looking for is the nightshades. God made nightshades kill humans through evolution.
Just don’t blow too much in their face, they’ll die really easily on Scopolamine. It effects the parasympathetic nervous system and their heart will forget it’s supposed to beat.