The cost savings for those in the US or Canada are likely to remain a determining factor - see diagram.
Relative costs of the barbiturates and the 3 & 4 Drug protocols The RP Test for the 4-Drug protocol (DDMP)
The 4-Drug protocol represents a reliable and peaceful (and cost effec- tive ) alternative to the barbiturates. Preparation is more involved, and the storage of the ingredients requires care. Availability scores better than Nembutal, however speed is slower. The result? A very credible 82%.