Wood and his colleagues came up with a new option this summer, a four-drug mixture that includes diazepam, digoxin, morphine and propranolol, known as DDMP. It costs between $300 and $600.
The mixture, which puts patients to sleep and then halts their heartbeat and breathing, has been used 38 times so far, Wood said.
"It is no more difficult than Seconal to ingest and it seems to work quite well," he added.
The mixture has been used "a fair amount" in California, where
an aid-in-dying law took effect in June, said Grube. It's not yet known how many terminally ill patients have died under that state's law, but dozens have requested prescriptions, officials said.