When two groups share an initial treatment, their later comparison cannot tell us how either follow-up drug would work on its own. Farnaghi and colleagues compared oral clonazepam and lorazepam in a 30-child methamphetamine poisoning pilot.
What the comparison covered
All children first received intravenous diazepam. Fifteen then received oral clonazepam and 15 received oral lorazepam. Two children in each group needed repeat intravenous diazepam for persistent agitation. Assignment was based on week of presentation, and the authors reported that they did not use a standardized agitation score over time.
What equal counts can establish
Two repeat doses in each group is a descriptive result. With 15 children per group, that result cannot establish equivalence or identify which drug would work better as initial therapy. In an individual record, separate the initial symptoms, first diazepam dose, oral follow-up drug and any further intervention. The trial helps identify those stages without providing a treatment rule for another child.
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