Packet of 3 ampoules of 1cc Doryl (carbamylcholine chloride), for subcutaneous or intramuscular injection, manufactured by Merk, c.1932, packet is stamped as a medical sample.

Also known as carbachol or its brand name Doryl, carbamylcholine chloride was used as a muscle relaxant and for treating glaucoma, relieving pressure in the eye, or during eye surgery.

Developed in 1932, by H Kreitmair while working in the laboratories of Merck, this sample was likely given to medical professionals to advertise a new product but also for researchers who wanted to investigate its potential uses.