Computing DDDs for specific combination therapies

[peterdutey]

Example

Eradication of Helicobacter pylori with ATC A02BD03 -- lansoprazole, amoxicillin and metronidazole (oral).
There is no DDD corresponding to this and would normally not be computed.

Current Ramses behaviour is to classify each drug order as one DDD (mostly from the J chapter). This results in accounting for amoxicillin will be to compute three DDDs:

• J01CA04 - 1.3333 DDD for Amox 1g BD
• J01XD01 - no valid DDDs for oral metronidazole on this ATC code
• Lansoprazole not given a DDD as not an antibiotic.

Conclusion: combination drugs should be examined in case this scenario appears in other more frequent combination therapies. Also should consider extending antiinfective_type to let Ramses consider support medications such as lansoprazole.

See also list of DDDs of combined products