Reacción a "Reactions: use of benzodiazepines increases the risk of miscarriage"

This is what we call a ‘case control study’.  It’s well conducted with big numbers, and I am in no doubt that they found an association.  But the big question is, is this cause and effect?  And the problem is we can’t tell.  There may be plenty of reasons why someone is being prescribed benzodiazepines and is also at higher risk of miscarriage.  They did the best they could to control for these, and the association remained, but it’s always an issue in this kind of study.  The main lesson is that for lots of reasons we should continue all efforts to reduce the prescriptions of benzodiazepines anyway, especially for anything more than a very short period.