This info from the Youscript website tells you which genes they test for.
You need to run your 23andme results through something like Promethease then search the report for the various CYP genes that Youscript lists.
This will give you an idea if you have variants affecting these drug metabolism genes. You can then search for drugs known to be metabolised by those particular CYP members.
This would be an approximation to the Youscript test since you don't know if they are testing for the same SNPs as 23andme, and you wouldn't be getting their interpretation of the results.
Still it should give you an idea if you have serious CYP problems. If so you could maybe then consider getting the Youscript test for at least those CYP members.